CN110726470A - High-precision three-dimensional sound field measuring system of medical ultrasonic equipment - Google Patents

Abstract

The invention discloses a high-precision three-dimensional sound field measurement system for medical ultrasonic equipment, comprising a hydrophone, an ultrasonic probe, a movable frame, a control module, a data acquisition device, a data processing module, a first motion drive module, and a second motion drive Module, analog simulation system, display device; the movable frame is detachably connected with a measuring tank, a three-axis motion positioning system, an ultrasonic probe fixture, a laser acquisition device fixture, and the three-axis motion positioning system is detachably connected with a hydrophone fixture The hydrophone fixture is detachably connected with the first laser, the ultrasonic probe fixture is detachably connected with the second laser, and the laser acquisition device fixture is detachably connected with a laser acquisition device; the invention effectively ensures the accuracy of the ultrasonic probe sound axis. It can detect the errors of the measurement data in time, and check and correct the measurement system, so as to realize the fast and accurate measurement of the sound field of the ultrasonic equipment.

Description

A high-precision three-dimensional sound field measurement system for medical ultrasound equipment

technical field

The invention relates to the field of acoustic measurement, in particular to a high-precision three-dimensional sound field measurement system of medical ultrasonic equipment.

Background technique

With the development of the economy and the improvement of living standards, the public's awareness of health is gradually increasing. And some medical ultrasound equipment, such as ultrasound diagnostic equipment, is very popular among doctors and patients due to its advantages of high precision, good sensitivity, fast imaging speed, and multiple and multi-directional detection. Ultrasound medical equipment is widely used in major hospitals, and the market for ultrasonic medical equipment is also growing in China. With the development of the medical device industry, medical ultrasound equipment emerges in an endless stream, such as ultrasound physiotherapy equipment, ultrasound therapy equipment, and ultrasound diagnostic equipment. However, excessive ultrasonic intensity will cause harm to the human body. In order to ensure the safety of patients when using ultrasonic equipment, the state stipulates that equipment that exceeds the sound output level specified by the standard should be announced to the public. Therefore, it is particularly important to measure the sound field parameters of medical ultrasound equipment.

At present, in the measurement of medical ultrasound, an ultrasonic power meter is an important device for measuring medical ultrasound instruments. The commonly used power meter is generally based on the method of radiation force, which perceives the radiation force of the ultrasonic sound field by reflecting the target or absorbing the target, and displays the output power of the ultrasonic equipment after a certain conversion. However, this device still has many problems, such as being easily affected by the environment, such as temperature and humidity, and air flow in an open environment, the stability is poor, and it can only display the power of the ultrasonic device, but cannot display the ultrasonic sound field. Transient peak sound pressure and other data. There are also many studies on the measurement of ultrasonic sound field by the hydrophone method at home and abroad. Usually, each device is installed and adjusted manually. However, due to factors such as installation error and manual adjustment error, the measurement accuracy is poor, the measurement efficiency is low, and It is difficult to detect the measurement errors caused by problems such as device damage, and it is impossible to accurately measure the sound field of the ultrasonic probe.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a high-precision three-dimensional sound field measurement system for medical ultrasonic equipment, so as to solve the above-mentioned problems in the prior art, and can effectively improve the measurement accuracy and efficiency of the three-dimensional sound field.

In order to achieve the above purpose, the present invention provides the following solutions: The present invention provides a high-precision three-dimensional sound field measurement system for medical ultrasonic equipment, including a hydrophone, an ultrasonic probe, a movable frame, a control module, a data acquisition device, and a data processing device. modules, a first motion drive module, a second motion drive module, an analog simulation system, and a display device; the movable frame is detachably connected with a measuring tank, a three-axis motion positioning system, an ultrasonic probe fixture, and a laser acquisition device fixture, A hydrophone clamp is detachably connected to the three-axis motion positioning system, a first laser is detachably connected to the hydrophone clamp, and a second laser is detachably connected to the ultrasonic probe clamp. A laser acquisition device is detachably connected to the device fixture;

The hydrophone is connected to the input end of the data acquisition device, and the output end of the data acquisition device is connected to the input end of the data processing module; the output ends of the data processing module and the simulation system are both connected to the the display device;

The three-axis motion positioning system is connected to the control module, and the three-axis motion positioning system receives the motion command of the control module, drives the hydrophone to execute the motion command in the measurement tank, and performs the motion command on the measurement tank. the location of the hydrophone in the measuring tank;

The first motion driving module is connected to the control module, the control module sends motion instructions to the first motion driving module, and the first motion driving module drives the ultrasonic probe fixture to perform automatic motion in the X and Y directions. adjust;

The output end of the laser collection device is connected to the control module, and is used for transmitting the laser information collected by the laser collection device to the control module;

The second motion driving module is connected to the control module, the control module sends an adjustment instruction to the second motion driving module, and the second motion driving module fine-tunes the angle of the hydrophone clamp.

Preferably, the ultrasonic probe fixture is used to fix the ultrasonic probe, and the ultrasonic probe fixture can be adjusted in three directions of X, Y, and Z;

The hydrophone clamp is used for fixing the hydrophone, and the hydrophone clamp can be automatically adjusted with four degrees of freedom;

The laser collection device is configured to receive laser information emitted by the first laser and the second laser.

Preferably, the hydrophone is a PVDF needle hydrophone, and the frequency response range of the hydrophone is 0-15 MHz.

Preferably, the data acquisition device is an oscilloscope.

Preferably, a temperature sensor is also fixedly connected to the bottom of the measuring tank, the temperature sensor is connected to the control module, and the control module is also connected to an acousto-optic alarm, and an acousto-optic alarm is performed when the temperature exceeds a threshold.

A high-precision three-dimensional sound field measurement method for medical ultrasound equipment, comprising the following steps:

S1. Parameter setting: input three-axis motion positioning system parameters, hydrophone parameters, and ultrasonic probe parameters to the control module;

S2. Adjustment of the azimuth angle of the hydrophone: install and fix the first laser, the second laser, and the laser acquisition device and open it; the laser acquisition device transmits the collected laser information to the control module, and the control module judges the hydrophone according to the laser information Whether it is aligned with the axis of the ultrasonic probe, if not, send an adjustment command to the three-axis motion positioning system and the second motion drive module, and the three-axis motion positioning system and the second motion drive module will adjust the position and direction of the hydrophone fixture. Adjust so that the axes of the hydrophone and the ultrasonic probe are aligned to ensure the measurement accuracy of the hydrophone; after the adjustment is completed, fix the hydrophone clamp, and remove the first laser, the second laser and the laser acquisition device;

S3. Preparation for sound field measurement: add degassed distilled water to the measurement tank and let it stand for 30 minutes to reduce the influence of air bubbles on the measurement results;

S4, ultrasonic probe position adjustment;

S5. Sound field measurement: turn on the measurement switch, the control module sends motion commands to the three-axis motion positioning system, and the three-axis motion positioning system drives the hydrophone to perform corresponding motion in the measurement tank; the instantaneous moment of each field point in the sound field is collected through the hydrophone sound pressure signal, and convert the collected sound pressure signal into a voltage signal in equal proportion, and transmit it to the data acquisition device;

S6. Comparison of data processing and simulation: input three-axis motion positioning system parameters, hydrophone parameters, and ultrasonic probe parameters to the simulation simulation system, and connect the display device; the data acquisition device transmits the voltage signal to the data processing module, and the data processing module performs Amplify and de-noise, and display it through a display device; synchronously display and compare the data output by the simulation simulation system and the data measured by the three-dimensional sound field measurement system. If the difference between the two is great, check and calibrate the measurement system, and Steps S1-S5 are repeated.

Preferably, the parameters of the three-axis motion positioning system in step S1 include: initial coordinates, motion direction, and motion step; hydrophone parameters include frequency range and sensitivity accuracy within the frequency bandwidth; ultrasonic probe parameters include structure type and working mode.

Preferably, the method for adjusting the position of the ultrasonic probe in step S4 is as follows: the control module estimates the focus position through the parameters of the ultrasonic probe, sets the near-field coordinate Z1=1cm, the far-field coordinate Z2 is the sum of the near-field coordinate and the estimated focus coordinate, and controls The module moves the hydrophone to the near-field Z1 surface through the three-axis motion positioning system, and locates the position coordinates (X1, Y1, Z1) with the largest sound pressure on the Z1 surface; fixed coordinates (X1, Y1), the control module is positioned by three-axis motion The system moves the hydrophone to the far-field Z2 plane. The control module adjusts the X and Y directions of the ultrasonic probe fixture through the first motion drive module to make the sound pressure waveform reach the maximum value; the control module returns the hydrophone through the three-axis motion positioning system. To the near-field Z1 surface, and locate at the position coordinates (X2, Y2, Z1) with the largest sound pressure on the Z1 surface, the control module compares whether the distance between (X1, Y1) and (X2, Y2) is less than 1/2 wavelength, If yes, then the acoustic axis of the ultrasonic probe is the collimated axis, and the position of the ultrasonic probe is adjusted. If not, repeat the adjustment of the X and Y directions of the ultrasonic probe fixture on the far-field Z2 surface to ensure that the acoustic axis of the ultrasonic probe is the collimated axis. .

The present invention discloses the following technical effects:

(1) The present invention automatically adjusts the ultrasonic probe and the hydrophone through the control module, effectively avoids the measurement error caused by manual adjustment, and improves the measurement efficiency;

(2) The present invention effectively ensures the collimation of the acoustic axis of the ultrasonic probe and the alignment of the axis of the ultrasonic probe and the hydrophone by combining the alignment and correction of the acoustic axis of the ultrasonic probe and the laser calibration of the hydrophone, so that the sound field measurement is more accurate;

(3) The present invention can detect errors in the measurement data in time by synchronizing the display and comparison between the simulation system and the measurement results, and check and correct the measurement system, thereby realizing the fast and accurate measurement of the three-dimensional sound field of the ultrasonic equipment.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative labor.

Fig. 1 is the system structure diagram of the present invention;

Fig. 2 is a flow chart of the measurement method of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

1-2, this embodiment provides a high-precision three-dimensional sound field measurement system for medical ultrasonic equipment, including a hydrophone, an ultrasonic probe, a movable frame, a control module, a data acquisition device, a data processing module, and a third A motion drive module, a second motion drive module, an analog simulation system, and a display device; the movable frame is detachably connected with a measuring tank, a three-axis motion positioning system, an ultrasonic probe fixture, and a laser acquisition device fixture, the three A hydrophone fixture is detachably connected to the axis motion positioning system, a first laser is detachably connected to the hydrophone fixture, a second laser is detachably connected to the ultrasonic probe fixture, and the laser acquisition device fixture is detachably connected. A laser collection device is detachably connected;

The ultrasonic probe fixture is used to fix the ultrasonic probe, and the ultrasonic probe fixture can be adjusted in three directions of X, Y, and Z;

The hydrophone clamp is used for fixing the hydrophone, and the hydrophone clamp can be automatically adjusted with four degrees of freedom;

The laser collection device is configured to receive laser information emitted by the first laser and the second laser;

The hydrophone is connected to the input end of the data acquisition device, and the output end of the data acquisition device is connected to the input end of the data processing module; the output ends of the data processing module and the simulation system are both connected to the the display device;

The three-axis motion positioning system is connected to the control module, and the three-axis motion positioning system receives the motion command of the control module, drives the hydrophone to execute the motion command in the measurement tank, and performs the motion command on the measurement tank. the location of the hydrophone in the measuring tank;

The first motion driving module is connected to the control module, the control module sends motion instructions to the first motion driving module, and the first motion driving module drives the ultrasonic probe fixture to perform automatic motion in the X and Y directions. adjust;

The output end of the laser collection device is connected to the control module, and is used for transmitting the laser information collected by the laser collection device to the control module;

The second motion driving module is connected to the control module, the control module sends an adjustment instruction to the second motion driving module, and the second motion driving module fine-tunes the angle of the hydrophone clamp.

The measuring water tank is a rectangular water tank with internal dimensions of 101cm*48cm*45cm; sound-absorbing materials are laid around and at the bottom of the water tank to achieve the effect of noise reduction and avoid the interference of echoes on the sound field; and the sound-absorbing water tank is filled with Gas distilled water can reduce the influence of cavitation effect on the sound field measurement results.

The ultrasonic probe is a sound-generating device of medical ultrasonic equipment, and ultrasonic diagnostic equipment, physiotherapy equipment, and therapeutic equipment emit ultrasonic waves through the ultrasonic probe to achieve the effect of treatment or diagnosis.

The hydrophone is a PVDF needle type hydrophone, which is used to receive the sound pressure signal sent by the ultrasonic probe and convert it into a voltage signal, and the frequency response range of the used hydrophone is 0-15MHz.

The data acquisition device is an oscilloscope.

The workflow of the high-precision 3D sound field measurement system for medical ultrasound equipment is as follows:

S1. Parameter setting: input three-axis motion positioning system parameters, hydrophone parameters, ultrasonic probe parameters to the control module; three-axis motion positioning system parameters include: initial coordinates, motion direction, motion step length; hydrophone parameters include frequency range , Sensitivity accuracy within the frequency bandwidth; ultrasonic probe parameters including structure type and working mode;

S2. Adjustment of the azimuth angle of the hydrophone: install and fix the first laser, the second laser, and the laser acquisition device and open it; the laser acquisition device transmits the collected laser information to the control module, and the control module judges the hydrophone according to the laser information Whether it is aligned with the axis of the ultrasonic probe, if not, send an adjustment command to the three-axis motion positioning system and the second motion drive module, and the three-axis motion positioning system and the second motion drive module will adjust the position and direction of the hydrophone fixture. Adjust so that the axes of the hydrophone and the ultrasonic probe are aligned to ensure the measurement accuracy of the hydrophone; after the adjustment is completed, fix the hydrophone clamp, and remove the first laser, the second laser and the laser acquisition device;

S3. Preparation for sound field measurement: add degassed distilled water to the measurement tank and let it stand for 30 minutes to reduce the influence of air bubbles on the measurement results;

S4, ultrasonic probe position adjustment: the control module estimates the focus position through the parameters of the ultrasonic probe, sets the near-field coordinate Z1=1cm, the far-field coordinate Z2 is the sum of the near-field coordinate and the estimated focus coordinate, and the control module moves through three axes The positioning system moves the hydrophone to the near-field Z1 surface, and locates the position coordinates (X1, Y1, Z1) with the largest sound pressure on the Z1 surface; fixed coordinates (X1, Y1), the control module moves the hydrophone through the three-axis motion positioning system. Move to the far-field Z2 plane, the control module adjusts the X and Y directions of the ultrasonic probe fixture through the first motion drive module, so that the sound pressure waveform reaches the maximum value; the control module returns the hydrophone to the near-field Z1 plane through the three-axis motion positioning system, And locate the position coordinates (X2, Y2, Z1) with the largest sound pressure on the Z1 surface, the control module compares whether the distance between (X1, Y1) and (X2, Y2) is less than 1/2 wavelength, if so, then the ultrasonic probe The acoustic axis of the ultrasonic probe is the collimated axis, and the ultrasonic probe position is adjusted. If not, repeat the adjustment of the X and Y directions of the ultrasonic probe fixture on the far-field Z2 surface to ensure that the acoustic axis of the ultrasonic probe is the collimated axis;

S5. Sound field measurement: turn on the measurement switch, the control module sends motion commands to the three-axis motion positioning system, and the three-axis motion positioning system drives the hydrophone to perform corresponding motion in the measurement tank; the instantaneous moment of each field point in the sound field is collected through the hydrophone sound pressure signal, and convert the collected sound pressure signal into a voltage signal in equal proportion, and transmit it to the data acquisition device;

S6. Comparison of data processing and simulation: input three-axis motion positioning system parameters, hydrophone parameters, and ultrasonic probe parameters to the simulation simulation system, and connect the display device; the data acquisition device transmits the voltage signal to the data processing module, and the data processing module performs Amplify and de-noise, and display it through a display device; synchronously display and compare the data output by the simulation simulation system and the data measured by the three-dimensional sound field measurement system. If the difference between the two is great, check and calibrate the measurement system, and Steps S1-S5 are repeated.

In the description of the present invention, it should be understood that the terms "portrait", "horizontal", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or It is implied that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

The above-mentioned embodiments are only to describe the preferred modes of the present invention, but not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those of ordinary skill in the art can make various modifications to the technical solutions of the present invention. Variations and improvements should fall within the protection scope determined by the claims of the present invention.

Claims (8)

1. a high-precision three-dimensional sound field measurement system of medical ultrasonic equipment, is characterized in that, comprises hydrophone, ultrasonic probe, movable frame, control module, data acquisition device, data processing module, the first motion drive module, the first Two motion drive modules, an analog simulation system, and a display device; the movable frame is detachably connected with a measuring tank, a three-axis motion positioning system, an ultrasonic probe fixture, and a laser acquisition device fixture, and the three-axis motion positioning system can be connected to A hydrophone fixture is detachably connected, a first laser is detachably connected to the hydrophone fixture, a second laser is detachably connected to the ultrasonic probe fixture, and a laser acquisition device is detachably connected to the laser acquisition device fixture device; The hydrophone is connected to the input end of the data acquisition device, and the output end of the data acquisition device is connected to the input end of the data processing module; the output ends of the data processing module and the simulation system are both connected to the the display device; The three-axis motion positioning system is connected to the control module, and the three-axis motion positioning system receives the motion command of the control module, drives the hydrophone to execute the motion command in the measurement tank, and performs the motion command on the measurement tank. the location of the hydrophone in the measuring tank; The first motion driving module is connected to the control module, the control module sends motion instructions to the first motion driving module, and the first motion driving module drives the ultrasonic probe fixture to perform automatic motion in the X and Y directions. adjust; The output end of the laser collection device is connected to the control module, and is used for transmitting the laser information collected by the laser collection device to the control module; The second motion driving module is connected to the control module, the control module sends an adjustment instruction to the second motion driving module, and the second motion driving module fine-tunes the angle of the hydrophone clamp. 2. The high-precision three-dimensional sound field measurement system of medical ultrasonic equipment according to claim 1, wherein the ultrasonic probe clamp is used to fix the ultrasonic probe, and the ultrasonic probe clamp can adjustment in each direction; The hydrophone clamp is used for fixing the hydrophone, and the hydrophone clamp can be automatically adjusted with four degrees of freedom; The laser collection device is configured to receive laser information emitted by the first laser and the second laser. 3 . The high-precision three-dimensional sound field measurement system for medical ultrasound equipment according to claim 1 , wherein the hydrophone is a PVDF needle hydrophone, and the frequency response range of the hydrophone is 0-15 MHz. 4 . 4 . The high-precision three-dimensional sound field measurement system for medical ultrasound equipment according to claim 1 , wherein the data acquisition device is an oscilloscope. 5 . 5. The high-precision three-dimensional sound field measurement system for medical ultrasound equipment according to claim 1, wherein a temperature sensor is also fixedly connected to the bottom of the measurement water tank, and the temperature sensor is connected to the control module, and the control The module is also connected with a sound and light alarm, and the temperature exceeds the threshold for sound and light alarm. 6. A high-precision three-dimensional sound field measurement method for medical ultrasound equipment, comprising the following steps: S1. Parameter setting: input three-axis motion positioning system parameters, hydrophone parameters, and ultrasonic probe parameters to the control module; S2. Adjustment of the azimuth angle of the hydrophone: install and fix the first laser, the second laser, and the laser acquisition device and open it; the laser acquisition device transmits the collected laser information to the control module, and the control module judges the hydrophone according to the laser information Whether it is aligned with the axis of the ultrasonic probe, if not, send an adjustment command to the three-axis motion positioning system and the second motion drive module, and the three-axis motion positioning system and the second motion drive module will adjust the position and direction of the hydrophone fixture. Adjust so that the axes of the hydrophone and the ultrasonic probe are aligned to ensure the measurement accuracy of the hydrophone; after the adjustment is completed, fix the hydrophone clamp, and remove the first laser, the second laser and the laser acquisition device; S3. Preparation for sound field measurement: add degassed distilled water to the measurement tank and let it stand for 30 minutes to reduce the influence of air bubbles on the measurement results; S4, ultrasonic probe position adjustment; S5. Sound field measurement: turn on the measurement switch, the control module sends motion commands to the three-axis motion positioning system, and the three-axis motion positioning system drives the hydrophone to perform corresponding motion in the measurement tank; the instantaneous moment of each field point in the sound field is collected through the hydrophone sound pressure signal, and convert the collected sound pressure signal into a voltage signal in equal proportion, and transmit it to the data acquisition device; S6. Comparison of data processing and simulation: input three-axis motion positioning system parameters, hydrophone parameters, and ultrasonic probe parameters to the simulation simulation system, and connect the display device; the data acquisition device transmits the voltage signal to the data processing module, and the data processing module performs Amplify and de-noise, and display it through a display device; synchronously display and compare the data output by the simulation simulation system and the data measured by the three-dimensional sound field measurement system. If the difference between the two is great, check and calibrate the measurement system, and Steps S1-S5 are repeated. 7. The high-precision three-dimensional sound field measurement method for medical ultrasound equipment according to claim 6, wherein the parameters of the three-axis motion positioning system in step S1 include: initial coordinates, motion direction, and motion step length; hydrophone parameters include: Frequency range, sensitivity accuracy within frequency bandwidth; ultrasonic probe parameters including structure type and working mode. 8. The high-precision three-dimensional sound field measurement method for medical ultrasound equipment according to claim 6, wherein the method for adjusting the position of the ultrasound probe in step S4 is: the control module estimates the focus position through parameters of the ultrasound probe, and sets the near-field coordinates Z1=1cm, the far-field coordinate Z2 is the sum of the near-field coordinate and the estimated focus coordinate, the control module moves the hydrophone to the near-field Z1 surface through the three-axis motion positioning system, and locates the position coordinate (X1 , Y1, Z1); fixed coordinates (X1, Y1), the control module moves the hydrophone to the far-field Z2 plane through the three-axis motion positioning system. The control module adjusts the X and Y directions of the ultrasonic probe fixture through the first motion drive module. Make the sound pressure waveform reach the maximum value; the control module returns the hydrophone to the near-field Z1 surface through the three-axis motion positioning system, and locates the position coordinates (X2, Y2, Z1) with the maximum sound pressure on the Z1 surface, and the control module passes the comparison ( Whether the distance between X1, Y1) and (X2, Y2) is less than 1/2 wavelength, if so, the acoustic axis of the ultrasonic probe is the collimation axis, and the position of the ultrasonic probe is adjusted, if not, repeat the far-field Z2 plane Adjust the X and Y directions of the ultrasonic probe fixture to ensure that the acoustic axis of the ultrasonic probe is aligned.

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