阅读说明：本技术 一种齿科用x射线机自动透视曝光远程控制方法 (Automatic perspective exposure remote control method for dental X-ray machine ) 是由 唐蔚 石晓艳 韩建业 皇甫强 袁思波 于 2018-06-08 设计创作，主要内容包括：本发明涉及医疗设备技术领域,特别涉及一种齿科用X射线机自动透视曝光远程控制方法。所述控制方法包括两种：一种是获取目标对象第N帧图像的亮度；基于目标亮度及所述第N帧图像的亮度获取所述目标对象的等效体厚；在体厚模型中确定与所述目标对象的等效体厚匹配的曝光参数；基于所述曝光参数对所述目标对象进行透视。另一种是在系统自动计算曝光参数的同时,通过反馈电压远程控制装置精确调节到与所述目标对象的等效体厚匹配的曝光参数,对所述目标对象进行透视,可以快速地获取符合检测需求的目标亮度图像,远程控制端增加在很大程度上降低了透视过程中的辐射剂量,提高图像清晰度。(the invention relates to the technical field of medical equipment, in particular to an automatic perspective exposure remote control method of an X-ray machine for dentistry. The control method comprises two steps: one is to acquire the brightness of the Nth frame image of the target object; acquiring the equivalent body thickness of the target object based on the target brightness and the brightness of the Nth frame of image; determining exposure parameters matched with the equivalent body thickness of the target object in a body thickness model; perspective is performed on the target object based on the exposure parameters. The other method is that when the system automatically calculates the exposure parameters, the remote control device accurately adjusts the exposure parameters matched with the equivalent body thickness of the target object through the feedback voltage, perspective is carried out on the target object, a target brightness image meeting the detection requirement can be quickly obtained, the radiation dose in the perspective process is greatly reduced due to the increase of the remote control end, and the image definition is improved.)

1. A dental X-ray machine automatic perspective exposure remote control method is characterized in that the brightness of the Nth frame image of a target object is obtained, wherein N is more than or equal to N; acquiring the equivalent body thickness of the target object based on the target brightness and the brightness of the Nth frame of image; determining exposure parameters matched with the equivalent body thickness of the target object in a body thickness model; accurately adjusting the matched exposure parameters through a feedback voltage remote control device; perspective is performed on the target object based on the exposure parameters.

2. The control method according to claim 1, wherein the perspective of the target object based on the exposure parameter includes: and stopping paying off after performing M-frame exposure on the target object based on the exposure parameters, wherein M is less than or equal to 5.

3. The control method according to claim 1, wherein the obtaining the equivalent thickness of the target object based on the target brightness and the brightness of the nth frame image comprises: and obtaining the equivalent body thickness of the target object based on the body thickness corresponding to the exposure parameter of the Nth frame of image in the body thickness model.

4. The control method of claim 1, wherein obtaining the body thickness model comprises: acquiring exposure parameters corresponding to the image brightness of the phantoms with different thicknesses when the image brightness reaches the target brightness; the phantom thickness and the exposure parameters corresponding thereto are fitted.

5. The control method according to any one of claims 1 to 4, characterized in that the exposure parameters include at least: one of perspective voltage, perspective current, filtering type, field size and source image distance.

Technical Field

The invention relates to the field of medical apparatus and instrument research, in particular to an automatic perspective exposure remote control method for a dental X-ray machine.

Background

At present, the existing perspective exposure control technology has two control modes of perspective and exposure. Wherein, the perspective mode is generally a plurality of continuous frames of emission X-ray pulses, and the time of X-ray radiation is controlled by an operator. For the exposure mode, although the final displayed image is only 1 frame, the radiation dose of a single frame is large. Therefore, the radiation dose for acquiring images in these two modes is high. There is a need for a method that can change the control mode according to the actual needs of the customer to reduce the unnecessary radiation dose during the detection process and reduce the harm to the operator.

Disclosure of Invention

The embodiment of the invention provides a remote control method for automatic perspective exposure of a dental X-ray machine, which effectively reduces the radiation dose in the perspective process and quickly acquires a target brightness image meeting the detection requirement.

in a first aspect, an embodiment of the present invention provides a remote control method for automatic perspective exposure of a dental X-ray machine, including:

Acquiring the brightness of an Nth frame of image of the target object, wherein N is more than or equal to 1;

Acquiring the equivalent body thickness of the target object based on the target brightness and the brightness of the Nth frame of image;

Determining exposure parameters matched with the equivalent body thickness of the target object in a body thickness model;

And accurately adjusting exposure parameters matched with the equivalent body thickness of the target object through a feedback voltage remote control device.

Perspective is performed on the target object based on the exposure parameters.

Further, the perspective of the target object based on the exposure parameters comprises: and stopping paying off after performing M-frame exposure on the target object based on the exposure parameters, wherein M is less than or equal to 5.

Further, the method further comprises: obtaining the body thickness model, wherein obtaining the body thickness model comprises:

acquiring exposure parameters corresponding to the image brightness of the phantoms with different thicknesses when the image brightness reaches the target brightness;

The phantom thickness and the exposure parameters corresponding thereto are fitted.

Further, the exposure parameters include at least: one of perspective voltage, perspective current, filtering type, field size and source image distance.

on one hand, for a detected object with uniform thickness, obtaining the brightness of an N frame image of a target object, obtaining the equivalent body thickness of the target object based on the target brightness and the brightness of the N frame image, further determining an exposure parameter matched with the equivalent body thickness of the target object in a body thickness model, and performing perspective on the target object based on the exposure parameter; on the other hand, for the detected object with uneven thickness, the system automatically calculates the exposure parameters, and simultaneously, the corresponding exposure parameters are accurately adjusted through the feedback voltage remote control device, and the target object is subjected to perspective based on the exposure parameters, so that a target brightness image meeting the clinical requirement can be quickly acquired, and the radiation dose in the perspective process is reduced to a great extent.

Drawings

FIG. 1 is a schematic flow chart of an automatic perspective exposure remote control method for a dental X-ray machine according to an embodiment of the present invention; steps 1, 2, 3, 5 are a first method; steps 4, 5 are the second method.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It will be understood that what is described herein is

The specific embodiments described above are merely illustrative of the invention and are not intended to be limiting. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Those skilled in the art will appreciate that different target objects attenuate X-rays to different extents. If the attenuation degree of the target object to the X-ray is larger, the acquired image brightness is darker (the gray scale value is smaller), and if the attenuation degree of the target object to the X-ray is smaller, the acquired image brightness is brighter (the gray scale value is larger), and in both cases, the image does not reach the desired target brightness, so that the image is not clear. In order to obtain an image with a target brightness, the X-ray dose needs to be increased (by exposure parameter control) if the image brightness is too dark, and the X-ray dose needs to be decreased if the image brightness is too bright. Therefore, the X-ray dose is reasonably adjusted according to the attenuation degree of the target object with different thickness characteristics to the X-ray, and the image of the target brightness can be quickly obtained.

fig. 1 is a schematic flow chart of an automatic perspective exposure remote control method for a dental X-ray machine according to an embodiment of the present invention, and the automatic perspective exposure remote control method for a dental X-ray machine according to the present embodiment is applicable to perspective of a target object (usually a denture) by an X-ray machine.

Referring to fig. 1, the control method specifically includes the following steps:

Step 1, obtaining the brightness of the Nth frame of image of the target object, wherein N is more than or equal to 1. Wherein the target object is generally a denture. Generally, the acquisition of images in the fluoroscopy starts from frame 1, and in this embodiment, N is 1 as an example.

For the 1 st frame image, the exposure parameter is usually a preset exposure parameter, that is, the target object is subjected to perspective by using the preset exposure parameter, so as to obtain the brightness of the 1 st frame image of the target object.

The exposure parameters at least include: one of a perspective voltage, a perspective current, a filter model, a field size, and a Source Image Distance (SID). Wherein, the perspective voltage refers to the voltage between the cathode and the anode of the X-ray bulb tube capable of generating X-rays; the perspective current refers to the current between the cathode and the anode of the X-ray bulb tube; the filtration is used for filtering out unqualified X-ray beams, so that qualified X-ray beams must pass through substances before being emitted out of an X-ray bulb tube, and the substances are usually filtered by aluminum (Al) and copper (Cu); the field size is also an adjustable parameter, and if the field is large, the obtained image can see more tissues but has poor definition, and if the field is small, the obtained image can see less tissues but has high definition.

And 2, acquiring the equivalent body thickness of the target object based on the target brightness and the brightness of the Nth frame of image.

Specifically, the following can be found in a pre-generated body thickness model: and determining the equivalent body thickness of the target object in the body thickness model after finding the corresponding body model thickness, wherein the image brightness is the target brightness and the corresponding body model thickness is the same as the exposure parameter of the 1 st frame image.

And 3, determining exposure parameters matched with the equivalent body thickness of the target object in a body thickness model.

in this embodiment, the body thickness model may be a corresponding relationship between the body model thickness and the exposure parameter when the image brightness is the target brightness. Illustratively, the obtaining the body thickness model specifically includes: acquiring exposure parameters corresponding to the image brightness of the phantoms with different thicknesses when the image brightness reaches the target brightness;

fitting the phantom thickness and the exposure parameters corresponding thereto;

and the functional relation between the body model thickness and the exposure parameters obtained by fitting is the body thickness model. In this embodiment, a ten-level standard aluminum ladder with equivalent X-ray attenuation degree can be used for multiple fluoroscopy to obtain exposure parameters corresponding to images of phantoms with different thicknesses when the images reach the target brightness.

By determining exposure parameters that match the equivalent body thickness of the target object directly in a pre-generated body thickness model.

And 4, the corresponding exposure parameters are accurately adjusted through the feedback voltage remote control device, so that the aim of quickly adjusting the brightness of the current frame image to the target brightness can be fulfilled, the perspective time is shortened, and the radiation dose in the perspective process is reduced.

And 5, performing perspective on the target object based on the exposure parameters.

Illustratively, the perspective of the target object based on the exposure parameters comprises: and stopping paying off after performing M-frame exposure on the target object based on the exposure parameters, wherein M is less than or equal to 5.

In practical application, the thicknesses of most detected objects are not uniform, so that the brightness of an image obtained by performing one-time perspective on a target object based on the exposure parameters cannot reach the expected target brightness, at the moment, a second method is adopted, the exposure parameters are automatically calculated by a system, meanwhile, the corresponding exposure parameters are accurately adjusted through a feedback voltage remote control device, perspective is performed based on the exposure parameters, the actual brightness of the image can be more quickly close to the target brightness, and the paying-off is stopped when the actual brightness of the image obtained by perspective is consistent with the target brightness, namely, the perspective is stopped. Multiple tests show that the actual brightness of the image can be consistent with the target brightness after 2-3 frames of exposure is usually performed on the target object by adopting the automatic perspective exposure remote control method of the dental X-ray machine provided by the embodiment of the invention.

It should be noted that the equivalent body thickness of the target object acquired each time is different, because the actual brightness of each frame of image according to which the equivalent body thickness is acquired is different from each other. In the embodiment, the brightness of a first frame image of a target object is obtained through a preset exposure parameter, then the equivalent body thickness of the target object in a body thickness model is obtained based on the target brightness and the brightness of the first frame image, the attenuation degree of the target object to X-rays is represented by the equivalent body thickness, the exposure parameter most suitable for the current target object is further determined in the body thickness model according to the equivalent body thickness, meanwhile, the corresponding exposure parameter is accurately adjusted through a feedback voltage remote control device, the target object is subjected to perspective based on the determined exposure parameter, the target brightness image can be quickly obtained, and further, the image meeting the actual clinical requirement is obtained while the X-ray dosage in the whole perspective process is reduced.

By adopting the automatic perspective exposure remote control method provided by the embodiment of the invention in the dental X-ray machine, once the X-ray machine starts paying off by pressing an exposure button, and the target object is subjected to perspective by preset exposure parameters to obtain the brightness of the 1 st frame image, further the equivalent body thickness of the target object is obtained based on the target brightness and the brightness of the 1 st frame image, the exposure parameters matched with the equivalent body thickness of the target object are determined in a body thickness model, meanwhile, the corresponding exposure parameters are accurately adjusted by a feedback voltage remote control device, finally, the target object is subjected to perspective based on the exposure parameters matched with the equivalent body thickness of the target object, when the brightness of the current frame image reaches the target brightness, the paying off is immediately stopped, namely, the perspective is stopped, the whole process is automatically completed by the dental X-ray machine, and the exposure parameters are adjusted in the perspective process, the stopping of perspective, etc. all do not need operator's intervention, have improved the automation and the intelligent degree of dental X-ray machine to a certain extent, in addition, adopt feedback voltage remote control device accurate regulation exposure parameter, can acquire the target brightness image that accords with the demand fast accurately, can reduce about 55% radiation dose. In addition, in practical application, by adopting the automatic perspective exposure remote control method provided by the embodiment of the invention, the obtained image with the target brightness needs to be exposed for 2-3 frames at most, namely, the perspective can be automatically stopped by collecting the X-ray image of 2-3 frames at most.