阅读说明：本技术 双能曝光的切换控制方法、装置和电子设备 (Dual-energy exposure switching control method and device and electronic equipment ) 是由 杨向民 俞天涯 张政 于 2021-08-04 设计创作，主要内容包括：本发明提供一种双能曝光的切换控制方法、装置和电子设备,双能曝光的切换控制先确定球管在固定管电压下的管电流变化曲线；所述管电流变化曲线是指在固定管电压下,球管的管电流随时间的变化；获取球管的灯丝发射特性曲线和在设定管电压下的两组曝光参数；并根据所述两组曝光参数和所述灯丝发射特性曲线得到每组曝光参数对应到固定管电压下的管电流；其中,每组曝光参数包括管电压和管电流；根据所述在固定管电压下的管电流和所述管电流变化曲线得到所述两组曝光参数的间隔时间；根据间隔时间进行双能曝光的切换控制。通过本发明能够获得准确间隔时间,实现精准的双能曝光的切换控制。(The invention provides a switching control method and a switching control device for dual-energy exposure and electronic equipment, wherein the switching control of the dual-energy exposure firstly determines a tube current change curve of a bulb tube under a fixed tube voltage; the tube current change curve refers to the change of tube current of the bulb tube along with time under the fixed tube voltage; acquiring a filament emission characteristic curve of the bulb tube and two groups of exposure parameters under a set tube voltage; obtaining tube current of each group of exposure parameters corresponding to the fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve; wherein each group of exposure parameters comprises tube voltage and tube current; obtaining the interval time of the two groups of exposure parameters according to the tube current under the fixed tube voltage and the tube current change curve; and carrying out switching control of the dual-energy exposure according to the interval time. The invention can obtain accurate interval time and realize accurate switching control of dual-energy exposure.)

1. A switching control method of dual-energy exposure is characterized in that the switching control method of dual-energy exposure at least comprises the following steps:

determining a tube current change curve of the bulb tube under the fixed tube voltage; the tube current change curve refers to the change of tube current of the bulb tube along with time under the fixed tube voltage;

acquiring a filament emission characteristic curve of the bulb tube and two groups of exposure parameters under a set tube voltage; obtaining tube current of each group of exposure parameters corresponding to the fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve; wherein each group of exposure parameters comprises tube voltage and tube current;

obtaining the interval time of the two groups of exposure parameters according to the tube current under the fixed tube voltage and the tube current change curve;

and carrying out switching control of the dual-energy exposure according to the interval time.

2. The switching control method of dual energy exposure according to claim 1, characterized in that: the tube current change curve comprises a tube current rising curve and a tube current falling curve.

3. The switching control method of dual energy exposure according to claim 2, characterized in that: the determination process of the tube current rising curve comprises the following steps:

applying the fixed tube voltage to the bulb by a high voltage generator;

monitoring the filament current of the bulb, and when the filament current of the bulb rises to a first set value, starting to detect a first group of variation parameters of the bulb in a first time period, wherein the first group of variation parameters comprise a first group of tube current sequence value and a corresponding time sequence;

and obtaining a tube current rising curve of the bulb tube under the fixed tube voltage according to the first group of variation parameters of the bulb tube.

4. The switching control method of dual energy exposure according to claim 2, characterized in that: the determination process of the tube current drop curve comprises the following steps:

applying the fixed tube voltage to the bulb by a high voltage generator;

monitoring the filament current of the bulb, and when the filament current of the bulb drops to a second set value, starting to detect a second group of change parameters of the bulb in a second time period, wherein the second group of change parameters comprise a second group of tube current sequence value and a corresponding time sequence;

and obtaining a tube current drop curve of the bulb tube under the fixed tube voltage according to the second group of variation parameters of the bulb tube.

5. The switching control method of dual energy exposure according to claim 1, characterized in that: the two sets of exposure parameters under the set tube voltage include:

a first set of exposure parameters, the first set of exposure parameters being a first tube voltage to which the bulb is subjected, the first set of exposure parameters including a first tube voltage and a first tube current;

and a second set of exposure parameters, wherein the second set of exposure parameters is a second tube voltage applied to the bulb, and the second set of exposure parameters comprises a second tube voltage and a second tube current.

6. The switching control method of dual energy exposure according to claim 5, characterized in that: and obtaining the tube current of each group of exposure parameters corresponding to the fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve, wherein the tube current of the exposure parameters under the fixed tube voltage is obtained by mapping at least one group of exposure parameters in the two groups of exposure parameters to the filament emission characteristic curve.

7. The switching control method of dual energy exposure according to claim 6, characterized in that: the process of mapping the exposure parameters to the filament emission characteristic curve to obtain the tube current of the exposure parameters under the fixed tube voltage comprises the following steps:

determining the position of an exposure parameter in a filament emission characteristic curve;

determining filament current of the exposure parameter according to the position of the exposure parameter;

and determining the tube current of the exposure parameter corresponding to the fixed tube voltage according to the filament current.

8. A switching control device of dual-energy exposure is characterized in that: comprises that

A tube current curve module configured to determine a tube current variation curve of the bulb at a fixed tube voltage; the tube current change curve refers to the change of tube current of the bulb tube along with time under the fixed tube voltage;

the tube current conversion module is configured to obtain a filament emission characteristic curve of the bulb tube and two groups of exposure parameters under a set tube voltage; obtaining tube current of each group of exposure parameters corresponding to the fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve; wherein each group of exposure parameters comprises tube voltage and tube current;

the interval time calculation module is configured to obtain the interval time of the two groups of exposure parameters according to the tube current under the fixed tube voltage and the tube current change curve;

and the switching control module is configured to perform switching control of the dual-energy exposure according to the interval time.

9. An electronic device, comprising: a memory, a processor and a program stored in the memory and executable on the processor, the processor implementing the steps of the method for controlling switching of dual energy exposure of any one of claims 1 to 7 when executing the program.

Technical Field

The present invention relates to the field of dual-energy exposure control technologies, and in particular, to a method and an apparatus for controlling switching of dual-energy exposure, and an electronic device.

Background

The dual-energy subtraction is to use X-ray energy to expose in a short time to obtain two mixed images with bone images and soft tissue images to provide the diagnosis basis of medical images for doctors, and is realized by a dual-energy exposure method, wherein the dual-energy exposure means that 2 images are generated under different energies respectively by one X-ray detection, as shown in figure 1, the primary energy is higher, the primary energy is lower, the tube voltage corresponding to the high-energy exposure is usually 110kV to 130kV, and the tube voltage corresponding to the low-energy exposure is usually 60kV to 80 kV. In addition, the tube current for the two exposures will also differ. In the actual process, high-energy exposure and low-energy exposure can be carried out first, and low-energy exposure and high-energy exposure can be carried out first. Specifically, the X-ray machine requires a high voltage generator to provide high voltage to the bulb and current to the filament inside the bulb during each exposure, the filament current heats the filament to generate electrons, and then the high voltage accelerates the electrons to generate the required tube current.

In order to reduce artifacts caused by human motion (including breathing and heartbeat) when dual energy subtraction is performed, it is desirable that the interval Δ T between two exposures is as short as possible. The interval time delta T is because the tube voltage and the tube current of the two exposures are different, the required filament temperature is different, and the temperature change process can be completed only by a certain interval time. For example, if the corresponding filament current is high for the first exposure and low for the second exposure, then time is required to cool the filament before the second exposure; conversely, if the corresponding filament current is lower for the first exposure and higher for the second exposure, then time is required to heat the filament to a higher temperature before the second exposure.

The conventional dual-energy exposure can only give a longer time because the heating and cooling time of the filament required between two exposures is unknown, and the filament can be heated or cooled down enough time between two exposures. The time is usually greater than 150ms, but the interval time Δ T is long, which may cause error coding due to respiration, heartbeat, displacement, etc. of the human body, and further reduce the accuracy of the image to cause artifacts, so it is necessary to solve the technical problem of inaccurate filament heating and cooling time required between two exposures.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a switching control method, device and electronic device for dual-energy exposure, which are used to solve the problem of the filament heating and cooling time required between two exposures during dual-energy exposure, which is not known in the prior art.

To achieve the above and other related objects, the present invention provides a switching control method of dual-energy exposure, including at least:

determining a tube current change curve of the bulb tube under the fixed tube voltage; the tube current change curve refers to the change of tube current of the bulb tube along with time under the fixed tube voltage;

acquiring a filament emission characteristic curve of the bulb tube and two groups of exposure parameters under a set tube voltage; obtaining tube current of each group of exposure parameters corresponding to the fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve; wherein each group of exposure parameters comprises tube voltage and tube current;

obtaining the interval time of the two groups of exposure parameters according to the tube current under the fixed tube voltage and the tube current change curve;

and carrying out switching control of the dual-energy exposure according to the interval time.

Preferably, the tube current variation curve includes a tube current rising curve and a tube current falling curve.

Preferably, the determining of the tube current rise curve includes:

applying the fixed tube voltage to the bulb by a high voltage generator;

monitoring the filament current of the bulb, and when the filament current of the bulb rises to a first set value, starting to detect a first group of variation parameters of the bulb in a first time period, wherein the first group of variation parameters comprise a first group of tube current sequence value and a corresponding time sequence;

and obtaining a tube current rising curve of the bulb tube under the fixed tube voltage according to the first group of variation parameters of the bulb tube.

Preferably, the determination process of the tube current drop curve includes:

applying the fixed tube voltage to the bulb by a high voltage generator;

monitoring the filament current of the bulb, and when the filament current of the bulb drops to a second set value, starting to detect a second group of change parameters of the bulb in a second time period, wherein the second group of change parameters comprise a second group of tube current sequence value and a corresponding time sequence;

and obtaining a tube current drop curve of the bulb tube under the fixed tube voltage according to the second group of variation parameters of the bulb tube.

Preferably, the two sets of exposure parameters at the set tube voltage include:

a first set of exposure parameters, the first set of exposure parameters being a first tube voltage to which the bulb is subjected, the first set of exposure parameters including a first tube voltage and a first tube current;

and a second set of exposure parameters, wherein the second set of exposure parameters is a second tube voltage applied to the bulb, and the second set of exposure parameters comprises a second tube voltage and a second tube current.

Preferably, the obtaining of the tube current of each group of exposure parameters corresponding to the fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve is to map at least one group of exposure parameters of the two groups of exposure parameters to the filament emission characteristic curve to obtain the tube current of the exposure parameters under the fixed tube voltage.

Preferably, the process of mapping the exposure parameter to the filament emission characteristic curve to obtain the tube current of the exposure parameter at a fixed tube voltage comprises:

determining the position of an exposure parameter in a filament emission characteristic curve;

determining filament current of the exposure parameter according to the position of the exposure parameter;

and determining the tube current of the exposure parameter corresponding to the fixed tube voltage according to the filament current.

To achieve the above and other related objects, the present invention further provides a switching control device for dual-energy exposure, comprising

A tube current curve module configured to determine a tube current variation curve of the bulb at a fixed tube voltage; the tube current change curve refers to the change of tube current of the bulb tube along with time under the fixed tube voltage;

the tube current conversion module is configured to obtain a filament emission characteristic curve of the bulb tube and two groups of exposure parameters under a set tube voltage; obtaining tube current of each group of exposure parameters corresponding to the fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve; wherein each group of exposure parameters comprises tube voltage and tube current;

the interval time calculation module is configured to obtain the interval time of the two groups of exposure parameters according to the tube current under the fixed tube voltage and the tube current change curve;

and the switching control module is configured to perform switching control of the dual-energy exposure according to the interval time.

To achieve the above and other related objects, the present invention also provides an electronic device, comprising: the system comprises a memory, a processor and a program which is stored in the memory and can run on the processor, wherein when the processor executes the program, the steps of the switching control method of the dual-energy exposure are realized.

As described above, the switching control method and apparatus for dual-energy exposure and the electronic device of the present invention have the following advantages:

the invention provides a dual-energy exposure switching control, which comprises the steps of firstly determining a tube current change curve of a bulb tube under a fixed tube voltage, then obtaining a tube current of the bulb tube corresponding to the fixed tube voltage through two groups of exposure parameters under the set tube voltage and a filament emission characteristic curve of the bulb tube, then carrying out dual-energy exposure switching control according to the tube current under the fixed voltage and the interval time between the tube current change curve under the fixed voltage and the two groups of exposure parameters, and finally carrying out dual-energy exposure switching control according to the interval time. The method can accurately obtain the interval time of the two groups of exposure parameters and can carry out more accurate control in the switching control process of the dual-energy exposure.

Drawings

Fig. 1 is a schematic diagram of a dual-energy exposure principle in the prior art.

FIG. 2 is a flow chart of the switching control method of dual-energy exposure according to the present invention.

FIG. 3 is a graph showing the variation curve of the tube current at a certain tube voltage according to the embodiment of the present invention.

Fig. 4 is a schematic diagram illustrating the principle of determining the rising curve of the tube current at a fixed tube voltage according to the embodiment of the present invention.

Fig. 5 is a schematic diagram illustrating the principle of determining a tube current drop curve at a fixed tube voltage according to an embodiment of the present invention.

Fig. 6 is a schematic diagram showing the filament emission characteristic of the bulb according to the embodiment of the present invention.

Fig. 7 is a flow chart showing mapping of exposure parameters to filament emission characteristics in an embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a switching control device for dual-energy exposure according to an embodiment of the present invention.

Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.

Aiming at the problems that when the image is obtained by adopting dual-energy exposure in the prior art, in order to ensure that enough time is available for heating or cooling the filament between two exposures, only a longer interval time can be set when the interval time between two exposures is not known, but the longer interval time can cause artifacts due to respiration, heartbeat and the like of a human body and reduce the quality of the image, the invention provides a switching control method, a device, a computing medium and electronic equipment of the dual-energy exposure.

The switching control of the dual-energy exposure provided by the invention mainly comprises the steps of firstly determining a tube current change curve of a bulb tube under a fixed tube voltage, then processing two groups of exposure parameters of the bulb tube under any tube voltage to obtain tube current of the bulb tube corresponding to the fixed tube voltage, then obtaining interval time of the two groups of exposure parameters through the tube current and the tube current change curve corresponding to the two groups of exposure parameters, and finally switching control is carried out on an actual dual-energy exposure process based on the interval time; the method comprises the steps of determining a tube current rising curve and a tube current falling curve of a bulb tube under fixed tube voltage in advance, then obtaining two groups of exposure parameters of the bulb tube under the arbitrarily set tube voltage, mapping the exposure parameters and a filament emission characteristic curve provided by a bulb tube manufacturer to obtain tube current of the bulb tube under the corresponding fixed tube voltage, then obtaining interval time of the exposure parameters by utilizing the tube current rising curve and the tube current falling curve of the bulb tube under the fixed tube voltage, and finally carrying out accurate switching control on a dual-energy exposure process according to the interval time.

The following describes the switching control scheme of dual-energy exposure according to the present invention in detail with reference to fig. 2 to 9

The method comprises the following steps:

FIG. 2 is a flow chart of the switching control method of dual-energy exposure according to the present invention; as shown in fig. 2, the method is used for switching control of dual-energy exposure, and comprises the following steps:

step S1, determining a tube current change curve of the bulb tube under the fixed tube voltage; the tube current change curve refers to the change of tube current of the bulb tube along with time under fixed voltage;

in the step, the heating time and the cooling time of the filament depend on the temperature of the filament, and the temperature of the filament depends on the current of the filament, so that the tube current change curve of the bulb tube under the fixed tube voltage is determined based on the tube voltage of the bulb tube and the corresponding filament current, and the interval time in the switching control process of the dual-energy exposure is calculated based on the determined tube current change curve.

In the embodiment of the present application, fig. 3 is a schematic diagram illustrating a tube current variation curve at a certain tube voltage; the tube current change curve comprises a tube current rising curve and a tube current falling curve; the tube current rising curve is used for representing the process that the filament is heated by the bulb tube between two exposures, and the tube current falling curve is used for representing the process that the filament is cooled by the bulb tube between two exposures.

FIG. 4 is a schematic diagram illustrating the determination of the tube current rise curve at a fixed tube voltage according to an embodiment of the present invention; the determination of the tube current rise curve comprises the following steps:

step S11, applying a fixed tube voltage to the bulb tube through a high voltage generator;

step S12, monitoring the filament current of the bulb, and when the filament current of the bulb rises to a first set value, starting to detect a first group of change parameters of the bulb in a first time period; the first set of variation parameters comprises a first set of tube current sequence values and corresponding time sequences;

and step S13, obtaining a tube current rising curve of the bulb under the fixed tube voltage according to the first group of variation parameters of the bulb.

In the process of determining the tube current rising curve, starting timing from the rise of the filament current of the bulb to a first set value in a first time period, and closing the tube voltage when the tube current is increased to the maximum tube current allowed by the bulb under the fixed tube voltage, wherein the tube current changes into the tube current rising curve in the period; the time corresponding to different tube currents in the rising change process of the tube current can be known through the tube current rising curve, so that the time interval of any two tube currents can be calculated.

In the present embodiment, a fixed tube voltage V is applied to the bulb by a high voltage generator₁I.e. a voltage value of 60 kV; after the bulb tube is applied with the fixed tube voltage, the tube voltage reaches a set value (namely the fixed tube voltage V)₁) Meanwhile, the filament current of the bulb tube is monitored, the filament current of the bulb tube rises from a lower value (for example, 2.2A in a standby state) to a maximum value (for example, 5.5A) allowed by the bulb tube, when the filament current rises to a first set value (for example, 5.5A), the filament temperature starts to rise gradually, correspondingly, under the condition that the fixed tube voltage is not changed, the tube current can gradually rise, therefore, when the filament current of the bulb tube rises to the first set value, a first group of tube current sequence values and a corresponding time sequence of the bulb tube in a first time period are started to be detected, and finally, the fixed tube current of the bulb tube is drawn according to the first group of tube current sequence values and the corresponding time sequence of the bulb tubeDepressed tube current rise curve.

FIG. 5 is a schematic diagram illustrating the method for determining a tube current drop curve at a fixed tube voltage according to an embodiment of the present invention; the determination of the tube current drop curve comprises the following steps:

step S21, applying a fixed tube voltage to the bulb tube through a high voltage generator;

step S22, monitoring the filament current of the bulb tube; when the filament current of the bulb tube drops to a second set value, a second group of change parameters of the bulb tube in a second time period are detected, wherein the second group of change parameters comprise a second group of tube current sequence values and corresponding time sequences;

and step S23, obtaining a tube current descending curve of the bulb tube under the fixed voltage according to the second group of variation parameters of the bulb tube.

In the process of determining the tube current descending curve, a second time period begins to time from the filament current of the bulb tube falling to a second set value, when the tube current falls to the minimum tube current allowed by the bulb tube under the fixed tube voltage, the tube voltage is closed, and the change of the tube current in the period is the tube current descending curve; the time corresponding to different tube currents in the process of the tube current reduction change can be known through the tube current reduction curve, so that the time interval of any two tube currents can be calculated.

In the present embodiment, the process of tube current decrease is similar to the process of tube current increase, except that a fixed tube voltage V is first applied to the bulb by the high voltage generator₁(ii) a And finally, drawing a tube current descending curve of the bulb tube under the fixed tube voltage according to the second group of tube current sequence values of the bulb tube and the corresponding time sequence.

Step S2, acquiring a filament emission characteristic curve of the bulb and two groups of exposure parameters of the bulb under a set tube voltage, and acquiring tube current of each group of exposure parameters corresponding to a fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve; wherein each group of exposure parameters comprises tube voltage and tube current;

step S21, acquiring a filament emission characteristic curve of the bulb;

in the embodiment of the invention, the filament emission characteristic curve of the bulb is provided by a bulb manufacturer, so that the filament emission characteristic curve of the bulb can be obtained by the bulb manufacturer. The filament emission characteristic curve shown in fig. 6 is the relationship between tube current and filament current at a certain tube voltage.

Step S22, acquiring two groups of exposure parameters of the bulb tube under the set tube voltage;

in the embodiment of the application, the two groups of exposure parameters of the bulb under the set tube voltage comprise a first group of exposure parameters and a second group of exposure parameters; specifically, a first group of exposure parameters are obtained first, and then a second group of exposure parameters are obtained, wherein the first group of exposure parameters are the voltage of a first tube applied to the bulb tube, and then the first group of exposure parameters comprise the voltage of the first tube and the current of the first tube; the second exposure parameter is that the bulb is subjected to a second tube voltage, and then the second set of exposure parameters includes a second tube voltage and a second tube current; correspondingly, the set tube voltage comprises a first tube voltage and a second tube voltage; in the embodiment of the present application, neither the first tube voltage nor the second tube voltage is equal to the fixed tube voltage value, and as another implementation, the first tube voltage or the second tube voltage may be equal to the fixed tube voltage value.

And step S23, obtaining tube current of each group of exposure parameters corresponding to the fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve.

In the embodiment of the present application, in consideration of the fact that there is no corresponding tube current variation curve under a certain tube voltage in the actual use process, that is, the tube current variation curve under the fixed tube voltage is uniquely determined, and the two sets of exposure parameters cannot be both located in the tube current variation curve, so that at least one set of exposure parameters corresponding to the tube current under the fixed tube voltage needs to be found by using the filament emission characteristic curve. The invention considers that the heating time and the cooling time of the filament depend on the temperature of the filament, the temperature of the filament depends on the current of the filament, and the same filament current can generate different tube currents under different tube voltages; the required filament heating time or cooling time between exposures is obtained, while the filament temperature is not directly measurable, but can be reflected by a change in tube current. Therefore, the invention adopts a method of mapping the exposure parameters to the filament emission characteristic curve to obtain the tube current of the exposure parameters corresponding to the fixed tube voltage. At least one of the two groups of exposure parameters is mapped to the filament emission characteristic curve to obtain the tube current of the exposure parameter corresponding to the fixed tube voltage.

Fig. 7 is a schematic flow chart illustrating mapping of exposure parameters to filament emission characteristic curves according to an embodiment of the present invention, and a process of mapping exposure parameters to filament emission characteristic curves to obtain tube currents of exposure parameters corresponding to a fixed tube voltage according to the present application is described with reference to fig. 7.

Step S231, determining the position of the exposure parameter in the filament emission characteristic curve;

in the embodiment of the present application, for more clearly describing the mapping process, it is assumed that neither of the two sets of exposure parameters is located in the tube current variation curve, that is, the exposure parameters are not under the fixed voltage, and the first tube voltage of the first set of exposure parameters is V₃The first tube current is I₄The position of the first group of exposure parameters on the filament emission characteristic curve is A; a second tube voltage of a second set of exposure parameters is V₂The second tube current is I₁The second set of exposure parameters is B at the position of the filament emission characteristic.

Step S232, determining filament current of the exposure parameter according to the position of the exposure parameter;

in the embodiment of the application, according to the position A of the first set of exposure parameters in the filament emission characteristic curve, the filament current corresponding to the position A is I_F1I.e. the filament current of the first set of exposure parameters is I_F1(ii) a According to the second group of exposure parameters at the position B of the filament emission characteristic curve, the filament current corresponding to the position B is I_F2I.e. the filament current of the second set of exposure parameters is I_F2。

Step S233, determining the tube current of the exposure parameter corresponding to the fixed tube voltage according to the filament current.

Firstly, determining the positions of the same filament currents on a fixed tube voltage curve in a filament emission characteristic curve graph according to the filament currents of exposure parameters; and then obtaining the tube current under the fixed tube voltage according to the position of the same filament current on the fixed tube voltage curve.

Specifically, the filament current according to the first set of exposure parameters is I_F1Finding the same filament current I_F1The fixed tube voltage curve of the lower filament emission characteristic curve, then according to the same filament current I_F1And fixed tube voltage V₁Determining the position a of the first group of exposure parameters on the filament emission characteristic curve after the first group of exposure parameters are mapped to the fixed tube voltage, and knowing that the corresponding tube current is I according to the position a on the filament emission characteristic curve₃That is, the first set of exposure parameters corresponds to a tube current I at a fixed tube voltage₃. Similarly, filament current I according to the second set of exposure parameters_F2Determining the position b of the second group of exposure parameters on the filament emission characteristic curve after the second group of exposure parameters are mapped to the fixed tube voltage, wherein the tube current corresponding to the fixed tube voltage is I₂That is, the second set of exposure parameters corresponds to a tube current I at a fixed tube voltage₂。

As another embodiment, if the tube voltage of one exposure parameter set is the same as the fixed tube voltage, and the tube voltage of the other exposure parameter set is different from the fixed tube voltage, the tube current corresponding to the fixed tube voltage can be obtained by processing the exposure and filament emission characteristic curves of the exposure parameter set, which are different from the fixed tube voltage.

It should be noted that, in the embodiment of the present application, there is no chronological relationship between step S1 and step S2, and step S1 may be executed first, and then step S2 may be executed; step S2 may be executed first, and then step S1 may be executed; or simultaneously performs step S1 and step S2. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.

Step S3, obtaining the interval time of two groups of exposure parameters according to the tube current and the tube current change curve under the fixed tube voltage;

in the present embodiment, the first set of exposure parameters corresponds to the tube current I at a fixed tube voltage₃The second set of exposure parameters corresponds to the tube current I at a fixed tube voltage₂In the embodiment of the present invention, it is assumed that the first set of exposure parameters is acquired first and then the second set of exposure parameters is acquired, and the tube current I₃Less than the tube current I₂That is, the tube current corresponding to the exposure parameter is in the rising trend, therefore, the tube current I is adjusted₃And tube current I₂Mapped on the rising curve of the tube current, tube current I₃Corresponding to time t₁Tube current I₂Corresponding to time t₂The interval time Δ t is t₂-t₁The time interval Δ t between the first set of exposure parameters and the second set of exposure parameters is also obtained.

As another embodiment, if the tube current of the first set of exposure parameters corresponding to the fixed tube voltage is larger than the tube current of the second set of exposure parameters corresponding to the fixed tube voltage, the interval time between the two sets of exposure parameters needs to be obtained through the tube current reduction curve.

The time interval of the two groups of exposure parameters obtained by the mutual mapping method is more accurate, the heating time or the cooling time required between exposures can be ensured, and the adverse effect caused by overlong time can be avoided.

In step S4, the switching control of the dual-energy exposure is performed according to the interval time.

In the embodiment of the invention, the switching control of the dual-energy exposure is directly carried out according to the interval time. In other embodiments, in consideration of other factors of other dual-energy exposures, the delay may be performed on the basis of the interval time, that is, the adjustment may be performed on the basis of the interval time according to actual requirements, so as to implement accurate switching control.

In the embodiment of the invention, after the interval time of the two groups of exposure parameters is obtained, according to the obtained accurate interval time, when the dual-energy exposure is carried out, the switching control can be carried out more accurately, and the quality of the dual-energy exposure is improved.

The embodiment of the device is as follows:

in order to solve the problems in the prior art, the present invention further provides a dual-energy exposure switching control device, as shown in fig. 8, the dual-energy exposure switching control device is an embodiment of the dual-energy exposure switching control device of the present invention, and the device is used for switching control of dual-energy exposure, and includes a tube current curve model, a tube current calculating module, an interval time calculating module, and a switching control module; the tube current curve module is configured to determine a tube current variation curve of the bulb tube under a fixed tube voltage; the tube current change curve refers to the change of tube current of the bulb tube along with time under the fixed tube voltage; the tube current conversion module is configured to obtain a filament emission characteristic curve of the bulb tube and two groups of exposure parameters under a set tube voltage; obtaining tube current of each group of exposure parameters corresponding to the fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve; wherein each group of exposure parameters comprises tube voltage and tube current; the interval time calculation module is configured to obtain the interval time of the two groups of exposure parameters according to the tube current under the fixed tube voltage and the tube current change curve; the switching control module is configured to perform switching control of the dual-energy exposure according to the interval time.

The specific functions and implementation means of the different modules in the dual-energy exposure switching control device have been described in detail in the method embodiments, and are not described herein again.

Electronic equipment embodiment:

fig. 9 is a schematic structural diagram of an electronic device provided in an embodiment of the present invention; as shown in fig. 9, the electronic device includes a memory, a processor, and a program stored in the memory and executable on the processor, and when the processor executes the program, the following steps are implemented: determining a tube current change curve of the bulb tube under the fixed tube voltage; the tube current change curve refers to the change of tube current of the bulb tube along with time under the fixed tube voltage; acquiring a filament emission characteristic curve of the bulb tube and two groups of exposure parameters under a set tube voltage; obtaining tube current of each group of exposure parameters corresponding to the fixed tube voltage according to the two groups of exposure parameters and the filament emission characteristic curve; wherein each group of exposure parameters comprises tube voltage and tube current; obtaining the interval time of the two groups of exposure parameters according to the tube current under the fixed tube voltage and the tube current change curve; and carrying out switching control of the dual-energy exposure according to the interval time. The above description is merely exemplary, and the embodiments of the present application do not limit the present invention.

The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc., and may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

The electronic device of the embodiments of the present application exists in various forms, including but not limited to:

(1) a mobile communication device: such devices are characterized by mobile communications capabilities and are primarily targeted at providing voice, data communications. Such terminals include: smart phones (e.g., IPhone), multimedia phones, functional phones, and low-end phones, etc.

(2) Ultra mobile personal computer device: the equipment belongs to the category of personal computers, has calculation and processing functions and generally has the characteristic of mobile internet access. Such terminals include: PDA, MID, and UMPC devices, etc., such as Ipad.

(3) A portable entertainment device: such devices can display and play multimedia content. This type of device comprises: audio and video players (e.g., iPod), handheld game players, electronic books, and smart toys and portable car navigation devices.

(4) A server: the device for providing the computing service comprises a processor, a hard disk, a memory, a system bus and the like, and the server is similar to a general computer architecture, but has higher requirements on processing capacity, stability, reliability, safety, expandability, manageability and the like because of the need of providing high-reliability service.

(5) And other electronic devices with data interaction functions.

It should be noted that, according to the implementation requirement, each component/step described in the embodiment of the present application may be divided into more components/steps, or two or more components/steps or partial operations of the components/steps may be combined into a new component/step to achieve the purpose of the embodiment of the present application.

The above-described methods according to embodiments of the present application may be implemented in hardware, firmware, or as software or computer code storable in a recording medium such as a CD ROM, a RAM, a floppy disk, a hard disk, or a magneto-optical disk, or as computer code originally stored in a remote recording medium or a non-transitory machine storage medium and to be stored in a local recording medium downloaded through a network, so that the methods described herein may be stored in such software processes on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware such as an ASIC or FPGA. It will be appreciated that the computer, processor, microprocessor controller or programmable hardware includes memory components (e.g., RAM, ROM, flash memory, etc.) that can store or receive software or computer code that, when accessed and executed by the computer, processor or hardware, implements the dual-energy exposure switching control method described herein. Further, when a general-purpose computer accesses code for implementing the methods illustrated herein, execution of the code transforms the general-purpose computer into a special-purpose computer for performing the methods illustrated herein.

Those of ordinary skill in the art will appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the particular application of the solution and the constraints involved. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the embodiments of the present application.

In summary, the switching control of the dual-energy exposure of the present invention firstly determines the tube current variation curve of the bulb under the fixed tube voltage, then processes two groups of exposure parameters of the bulb under any tube voltage to obtain the tube current of the bulb corresponding to the fixed tube voltage, then obtains the interval time of the two groups of exposure parameters through the tube current and the tube current variation curve corresponding to the two groups of exposure parameters, and finally performs the switching control of the actual dual-energy exposure process based on the interval time; the accurate interval time of two sets of exposure parameters is obtained through mapping, switching control can be more accurate through the accurate interval time, and the obtained control result can be better. The image obtained in the medical application field is more accurate, the basis provided for a doctor is more accurate, and the doctor can make a treatment scheme more accurately. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.