阅读说明：本技术 一种基于透镜回波的超声探头带宽检测方法及系统 (Ultrasonic probe bandwidth detection method and system based on lens echo ) 是由 吴宇鹏 冯巧梅 于 2020-07-09 设计创作，主要内容包括：本发明公开了一种基于透镜回波的超声探头带宽检测方法及系统,其中所涉及的一种基于透镜回波的超声探头带宽检测方法,包括步骤：S11.获取脉冲发射器生成的窄脉冲波形,并存储所述窄脉冲波形；S12.将所述窄脉冲波形作为发射波形,并获取示波器采集的超声探头表面透镜回波对应的通道信号,存储所述通道信号；S13.分别计算所述窄脉冲波形与通道信号的频谱,根据计算得到的窄脉冲波形的频谱和通道信号的频谱计算超声探头脉冲响应频谱,得到超声探头的带宽。本发明利用探头透镜与空气声阻抗不匹配产生的透镜回波检测超声探头带宽,提高了超声探头带宽测量的精度,降低了超声探头带宽测量复杂度。(The invention discloses a method and a system for detecting the bandwidth of an ultrasonic probe based on lens echo, wherein the method for detecting the bandwidth of the ultrasonic probe based on the lens echo comprises the following steps: s11, acquiring a narrow pulse waveform generated by a pulse transmitter, and storing the narrow pulse waveform; s12, taking the narrow pulse waveform as a transmitting waveform, acquiring a channel signal corresponding to an ultrasonic probe surface lens echo acquired by an oscilloscope, and storing the channel signal; and S13, respectively calculating the frequency spectrums of the narrow pulse waveform and the channel signal, and calculating the pulse response frequency spectrum of the ultrasonic probe according to the frequency spectrum of the narrow pulse waveform and the frequency spectrum of the channel signal obtained through calculation to obtain the bandwidth of the ultrasonic probe. The invention utilizes the lens echo generated by the acoustic impedance mismatching of the probe lens and the air to detect the bandwidth of the ultrasonic probe, improves the precision of the bandwidth measurement of the ultrasonic probe and reduces the complexity of the bandwidth measurement of the ultrasonic probe.)

1. A method for detecting the bandwidth of an ultrasonic probe based on lens echo is characterized by comprising the following steps:

s1, acquiring a narrow pulse waveform generated by a pulse transmitter, and storing the narrow pulse waveform;

s2, taking the narrow pulse waveform as a transmitting waveform, acquiring a channel signal corresponding to an ultrasonic probe surface lens echo acquired by an oscilloscope, and storing the channel signal;

and S3, respectively calculating the frequency spectrums of the narrow pulse waveform and the channel signal, and calculating the pulse response frequency spectrum of the ultrasonic probe according to the frequency spectrum of the narrow pulse waveform and the frequency spectrum of the channel signal obtained through calculation to obtain the bandwidth of the ultrasonic probe.

2. The method for detecting the bandwidth of the ultrasonic probe based on the lens echo as claimed in claim 1, wherein the channel signals corresponding to the lens echo on the surface of the ultrasonic probe in the step S2 are represented as:

s(t)＝e(t)*h(t)

wherein, s (t) represents a channel signal corresponding to the surface lens echo of the ultrasonic probe; e (t) represents a narrow pulse waveform generated by the pulse emitter; h (t) represents the ultrasound probe impulse response.

3. The method for detecting the bandwidth of the ultrasonic probe based on the lens echo according to claim 2, wherein the spectrum of the narrow pulse waveform is calculated in step S3 and is represented as:

where e (w) represents the frequency spectrum of the narrow pulse waveform.

4. The method for detecting the bandwidth of the ultrasonic probe based on the lens echo as claimed in claim 3, wherein the frequency spectrum of the channel signal is calculated in the step S3 and is represented as:

where s (w) represents the frequency spectrum of the channel signal.

5. The method for detecting the bandwidth of the ultrasonic probe based on the lens echo as claimed in claim 4, wherein the ultrasonic probe impulse response spectrum is calculated in the step S3 and is expressed as:

where h (w) represents the ultrasound probe impulse response spectrum or the bandwidth of the ultrasound probe.

6. The method for detecting the bandwidth of the ultrasonic probe based on the lens echo according to claim 1, wherein the step S2, before the step S2, further includes connecting an ultrasonic probe to a pulse generator, wherein the ultrasonic probe is placed in the air.

7. A lens echo based ultrasonic probe bandwidth detection system, comprising:

the first acquisition module is used for acquiring a narrow pulse waveform generated by a pulse transmitter and storing the narrow pulse waveform;

the second acquisition module is used for taking the narrow pulse waveform as a transmitting waveform, acquiring a channel signal corresponding to the ultrasonic probe surface lens echo acquired by the oscilloscope, and storing the channel signal;

and the calculation module is used for calculating the frequency spectrums of the narrow pulse waveform and the channel signal respectively, and calculating the pulse response frequency spectrum of the ultrasonic probe according to the frequency spectrum of the narrow pulse waveform and the frequency spectrum of the channel signal obtained through calculation to obtain the bandwidth of the ultrasonic probe.

8. The system for detecting the bandwidth of an ultrasonic probe based on lens echo according to claim 7, wherein the channel signals corresponding to the lens echo on the surface of the ultrasonic probe in the second acquisition module are represented as:

s(t)＝e(t)*h(t)

wherein, s (t) represents a channel signal corresponding to the surface lens echo of the ultrasonic probe; e (t) represents a narrow pulse waveform generated by the pulse emitter; h (t) represents the ultrasound probe impulse response.

9. The system of claim 8, wherein the computing module computes a spectrum of the narrow pulse waveform as:

where e (w) represents the frequency spectrum of the narrow pulse waveform.

Calculating the frequency spectrum of the channel signal, expressed as:

where s (w) represents the frequency spectrum of the channel signal.

An ultrasound probe impulse response spectrum is calculated, expressed as:

where h (w) represents the ultrasound probe impulse response spectrum or the bandwidth of the ultrasound probe.

10. The system of claim 7, further comprising an ultrasonic probe connected to the pulse generator, wherein the ultrasonic probe is placed in the air.

Technical Field

The invention relates to the technical field of ultrasonic probe detection, in particular to a lens echo-based ultrasonic probe bandwidth detection method and system.

Background

An ultrasonic probe is a device that transmits and receives ultrasonic waves during ultrasonic testing. The performance of the probe directly affects the characteristics of the ultrasonic waves and the detection performance of the ultrasonic waves.

In an ultrasound system, however, the bandwidth determines the image quality of harmonic imaging and contrast imaging, while the bandwidth of the ultrasound probe determines the bandwidth of the ultrasound system. Currently, the measurement of the bandwidth of the ultrasonic probe is mainly obtained by reflecting the echo of a target in water. The method is influenced by the alignment precision of the sound axis and acoustic nonlinearity, and cannot truly reflect the bandwidth characteristics of the ultrasonic probe, so that the optimization design of the ultrasonic probe is limited.

Disclosure of Invention

The invention aims to provide a method and a system for detecting the bandwidth of an ultrasonic probe based on lens echo aiming at the defects of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for detecting the bandwidth of an ultrasonic probe based on lens echo comprises the following steps:

s1, acquiring a narrow pulse waveform generated by a pulse transmitter, and storing the narrow pulse waveform;

s2, taking the narrow pulse waveform as a transmitting waveform, acquiring a channel signal corresponding to an ultrasonic probe surface lens echo acquired by an oscilloscope, and storing the channel signal;

and S3, respectively calculating the frequency spectrums of the narrow pulse waveform and the channel signal, and calculating the pulse response frequency spectrum of the ultrasonic probe according to the frequency spectrum of the narrow pulse waveform and the frequency spectrum of the channel signal obtained through calculation to obtain the bandwidth of the ultrasonic probe.

Further, the channel signal corresponding to the ultrasonic probe surface lens echo in step S2 is represented as:

s(t)＝e(t)*h(t)

wherein, s (t) represents a channel signal corresponding to the surface lens echo of the ultrasonic probe; e (t) represents a narrow pulse waveform generated by the pulse emitter; h (t) represents the ultrasound probe impulse response.

Further, the spectrum of the narrow pulse waveform is calculated in step S3, and is represented as:

where e (w) represents the frequency spectrum of the narrow pulse waveform.

Further, in step S3, the frequency spectrum of the channel signal is calculated, and is represented as:

where s (w) represents the frequency spectrum of the channel signal.

Further, in step S3, an impulse response spectrum of the ultrasound probe is calculated, which is represented as:

where h (w) represents the ultrasound probe impulse response spectrum or the bandwidth of the ultrasound probe.

Further, before the step S2, the method further includes connecting an ultrasonic probe to the pulse generator, where the ultrasonic probe is placed in the air.

Correspondingly, the ultrasonic probe bandwidth detection system based on lens echo is also provided, and comprises:

the first acquisition module is used for acquiring a narrow pulse waveform generated by a pulse transmitter and storing the narrow pulse waveform;

the second acquisition module is used for taking the narrow pulse waveform as a transmitting waveform, acquiring a channel signal corresponding to the ultrasonic probe surface lens echo acquired by the oscilloscope, and storing the channel signal;

and the calculation module is used for calculating the frequency spectrums of the narrow pulse waveform and the channel signal respectively, and calculating the pulse response frequency spectrum of the ultrasonic probe according to the frequency spectrum of the narrow pulse waveform and the frequency spectrum of the channel signal obtained through calculation to obtain the bandwidth of the ultrasonic probe.

Further, the channel signal corresponding to the echo of the surface lens of the ultrasonic probe in the second acquisition module is represented as:

s(t)＝e(t)*h(t)

wherein, s (t) represents a channel signal corresponding to the surface lens echo of the ultrasonic probe; e (t) represents a narrow pulse waveform generated by the pulse emitter; h (t) represents the ultrasound probe impulse response.

Further, the calculating module calculates a spectrum of the narrow pulse waveform, which is represented as:

where e (w) represents the frequency spectrum of the narrow pulse waveform.

Calculating the frequency spectrum of the channel signal, expressed as:

where s (w) represents the frequency spectrum of the channel signal.

An ultrasound probe impulse response spectrum is calculated, expressed as:

where h (w) represents the ultrasound probe impulse response spectrum or the bandwidth of the ultrasound probe.

Further, the second acquisition module further comprises an ultrasonic probe connected with the pulse generator, and the ultrasonic probe is placed in the air.

Compared with the prior art, the invention has the following beneficial effects:

1. the invention directly adopts the echo on the surface of the probe lens, and the sound path between the probe lens and the surface of the transducer is millimeter, so the sound wave propagation distance is short, the waveform distortion can be ignored, and the influence of acoustic nonlinearity on the bandwidth is avoided;

2. the lens echo measuring bandwidth adopted by the invention does not need to align the sound axis, and the probe is directly placed in the air, so that the restriction of the sound axis alignment precision on the bandwidth measurement of the ultrasonic probe in the prior art is eliminated;

3. the invention utilizes the lens echo generated by the acoustic impedance mismatching of the probe lens and the air to detect the bandwidth of the ultrasonic probe, improves the precision of the bandwidth measurement of the ultrasonic probe and reduces the complexity of the bandwidth measurement of the ultrasonic probe.

Drawings

FIG. 1 is a flow chart of a method for detecting a bandwidth of an ultrasonic probe based on lens echo according to an embodiment;

FIG. 2 is a schematic diagram of a bandwidth detection principle of an ultrasonic probe according to an embodiment;

fig. 3 is a structural diagram of a bandwidth detection system of an ultrasonic probe based on lens echo according to a second embodiment.

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. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

The invention aims to provide a method and a system for detecting the bandwidth of an ultrasonic probe based on lens echo aiming at the defects of the prior art.