CN107402388B - A kind of wide sound field imaging method of supersonic imaging device - Google Patents

A kind of wide sound field imaging method of supersonic imaging device Download PDF

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Publication number
CN107402388B
CN107402388B CN201710592696.5A CN201710592696A CN107402388B CN 107402388 B CN107402388 B CN 107402388B CN 201710592696 A CN201710592696 A CN 201710592696A CN 107402388 B CN107402388 B CN 107402388B
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China
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sound field
transmitting
imaging device
ultrasonic probe
direction
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CN201710592696.5A
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Chinese (zh)
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CN107402388A (en
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李腾飞
胡则肄
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武汉启佑生物医疗电子有限公司
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Abstract

The present invention relates to a kind of wide sound field imaging methods of supersonic imaging device, including:Rectangular coordinate system is established, the rectangular co-ordinate of all array elements is calculated;Starting point and the direction for calculating transmitting, establish direction of the launch vector;According to transmitting starting point and the depth of focus, focal coordinates are calculated;The vector for being directed toward the array element for participating in transmitting from focus is established, its modulus value and its angle between direction of the launch vector are calculated;According to angle, sound field ceofficient of spread and the velocity of sound, the emission delay of array element is calculated;Emitted into line width sound field according to the delay of calculating, and obtains ultrasonoscopy.The wide sound field imaging method of the present invention can be suitable for various probes, and be easily achieved.

Description

A kind of wide sound field imaging method of supersonic imaging device

Technical field

The present invention relates to a kind of wide sound field imaging methods of supersonic imaging device.

Background technology

Traditional ultrasonic device transmitting focusing generally uses point focusing, and focusing center is focus.Point focusing realization is simple, Sound field intensity is big within the scope of burnt area, and imaging resolution is high;Except the areas Dan Jiao, imaging has distortion distortion.In order to make whole field at As clearly, having also been proposed the mode of multifocal transmitting, repeatedly being emitted in the same transmitting position, form multiple and different depth Under focus, receive only receive the echo data of corresponding near focal point every time, ensure the equal blur-free imaging of each near focal point.Point is poly- Burnt major defect is that burnt area is narrow, can only cover the pocket in imaging region.

If it is desired to which imaging resolution is high, then require transmitting sound field that can cover entire imaging region, emitting times are larger, and This can reduce image frame per second;In some occasions more demanding to image frame per second, emitting times limitation is smaller, and transmitting sound field can only Covering part imaging region, this will reduce imaging resolution.For the contradiction between picture quality and image frame per second, some are specially The method that wide sound field transmitting is proposed in profit, broadens transmitting sound field every time so that only need to emit fewer number can cover entirely Imaging region, and then obtain frame per second height and high-quality image.

The existing method having proposed can substantially be divided into two classes:One kind is the method broadening transmitting sound using hardware optimization , such as by broadening transmitting main lobe to transmitting aperture adding window;One kind is to broaden transmitting sound field by control channel delay, For example transmitting aperture is divided into several parts, each part individually focuses, and multiple focuses of cross direction profiles is formed, to approach sound field The effect of broadening.

First kind method is to the more demanding of hardware, in practice less use;Second class method is then readily integrated into tradition Ultrasonic device in, application is more universal.Although the mode of point focusing is widely adopted, not yet propose that a kind of energy is universal at present Wide sound field launching technique suitable for various situations.The method proposed at present is mostly just for certain specific condition, such as line The method for widening that battle array probe and convex array probe use may be different, and deflection may be also different with the method for not deflecting use. Although realizing the effect of broadening, the otherness between method can increase burden to controller.

Invention content

In view of this, the main purpose of the present invention is to provide a kind of wide sound field imaging method of supersonic imaging device, this The wide sound field imaging method of invention can be suitable for various probes, and be easily achieved.

A kind of wide sound field imaging method of supersonic imaging device, the described method comprises the following steps:

A. rectangular coordinate system is established by the origin of rectangular coordinate system of the center of ultrasonic probe, owned according on ultrasonic probe The relative position relation of array element and ultrasonic probe center calculates the rectangular co-ordinate of all array elements of ultrasonic probe;

B. the radiation pattern set according to supersonic imaging device, calculates starting point and the direction of transmitting, establishes the direction of the launch Vector, direction of the launch vector are directed toward ultrasonic probe focus by transmitting starting point along the direction of the launch;

C. according to the depth of focus FocusDepth of transmitting starting point A and supersonic imaging device, ultrasonic probe focus is calculated Coordinate B;

D. establish from ultrasonic probe focus be directed toward participate in transmitting array element vector, calculate the vector modulus value Dist and Angle theta between the vector and direction of the launch vector;

E. according to angle theta, sound field ceofficient of spread k and velocity of sound c, the emission delay DelayTime of array element is calculated:

DelayTime=[FocusDepth* (k/cos θ+1-k)-Dist]/c+OffsetTime

Wherein, it is transmitting group delay that k, which is more than 0 and is less than 1, OffsetTime, and occurrence is determined by supersonic imaging device;

F. emitted into line width sound field according to the emission delay of calculating, and obtain ultrasonoscopy.

The ultrasonic probe is linear array probe, convex array probe or phased array probe.

The transmitting starting point is to calculate the reference point of emission delay.

The broadening degree of the sound field ceofficient of spread k characterizations sound field, when k tends to 1, sound field approaches plane wave;When k tends to 0, Sound field approaches point focusing.

The wide sound field imaging method of the present invention can be suitable for various probes, and be easily achieved.

Description of the drawings

Fig. 1 is typical supersonic imaging device structural schematic diagram;

Fig. 2 a are typical point focusing schematic diagram;

Fig. 2 b are that wide sound field of the present invention emits schematic diagram;

Fig. 2 c are that wide sound field when ceofficient of spread of the present invention tends to 1 emits schematic diagram;

Fig. 3 is wide sound field ultrasonic imaging method flow chart of the present invention;

Fig. 4 is wide sound field emission delay model schematic of the present invention;

Fig. 5 is the wide sound field emission delay schematic diagram of the present invention for calculating and emitting array element.

Specific implementation mode

Below in conjunction with the accompanying drawings and the embodiment of the present invention makees the wide sound field imaging method of the supersonic imaging device of the present invention Further details of explanation.

First, the conventional method of broadening transmitting sound field is illustrated in conjunction with attached drawing 2a, 2b and 2c.

Fig. 2 a are typical point focusing schematic diagram, and 201 refer to transmitting equiphase surface, and 202 refer to transmitting Jiao Qu.201 hairs It is one section of circular arc to penetrate equiphase surface, and the center of circle is the focus being within the scope of 202 burnt areas, because focus is to sound paths such as equiphase surface satisfactions, Therefore focal point sound field is applied enhancing, and near focal point region is also enhanced by different degrees of superposition, forms a bit of long and narrow Jiao Qu.According to Huygens-Fresnel principle, can intuitively draw one group of center of circle focus concentric circles equiphase surface.

Fig. 2 b are that wide sound field of the present invention emits schematic diagram, and 203 refer to transmitting equiphase surface, and 204 refer to emitting Jiao Qu.The present invention transmitting equiphase surface 203 and existing typical transmitting equiphase surface 201 difference lies in, 203 can be circular arc or Non- circular arc, it is more flat than 201, and the delay inequality that this is represented between different transmitting array elements is reduced.According to Huygens-Fresnel Principle can speculate within the scope of the burnt area in transmitting coke area 204 no longer there is the point to 203 equal sound paths, the point in burnt area is by more Uniform superposition enhancing, what sound field was extended more opens, and which forms the transmitting sound fields of broadening.

Fig. 2 c are that wide sound field when ceofficient of spread of the present invention tends to 1 emits schematic diagram, the hair of the delays such as approach at this time It penetrates, sound field broadening approach plane wave.

The delay inequality that can be seen that from above-mentioned elaboration between reducing transmitting array element can be such that transmitting sound field broadens, here it is Broaden the basic point of departure of sound field.

Then, it elaborates to wide sound field emission delay model of the present invention in conjunction with Fig. 4.

In Fig. 4, O is transmitting starting point, and y-axis is the direction of the launch, and x-axis be to emit starting point and vertical with the direction of the launch Straight line, E be transmitting focus, I be transmitting array element, 401 be O point focusing circular arc equiphase surface, 402 be the phases such as the wide sound field of O Face, θ are the angle of EI and y-axis, and F, G, H are respectively EI and 401,402, the intersection point of x-axis;Wherein, H and I can be overlapped, or not weighed It closes.

In stating below, amount of delay is represented with path difference.According to the elaboration of front, when equiphase surface is transformed to 402 by 401 When, sound field will be broadened;402 need to keep symmetrical about y-axis, to keep the direction of the launch after broadening constant.It is of the present invention Ceofficient of spread is defined as:

K=FG/FH, k are constant and are less than 1 more than 0;

Be apparent from, k level off to 0 when, 402 level off to 401, i.e. transmitting approach point focusing;K level off to 1 when, 402 level off to x Axis, i.e. transmitting approach plane wave.As can be seen that this broadening mode is unrelated with probe form from the definition of k, can generally fit For various conventional transducers.

According to geometrical relationship, there is following calculation formula:

FH=EH-EF=EO* (1/cos θ -1)

FG=k*FH=k*EO* (1/cos θ -1)

EG=EF+FG=EO* (k/cos θ+1-k)

IG=EI-EG=EI-EO* (k/cos θ+1-k)

IG is the amount of delay for representing transmitting array element I, such as following formula after the DelayTime standardization of emission delay amount:

DelayTime=OffsetTime-IG/c=[EO* (k/cos θ+1-k)-EI]/c+OffsetTime

Wherein, c is the velocity of sound, and OffsetTime is transmitting group delay, and occurrence is determined by supersonic imaging device, and EO is to focus Depth, EI are distance of the focus to array element.

In the following, be described in further details to the present invention in conjunction with the embodiments.

A kind of supersonic imaging device that the present embodiment uses, structure is as shown in Figure 1, it includes:Ultrasonic probe 102, hair Penetrate module 103, receiving module 104, echo data processing module 105, controller 106 and display module 107.Controller 106 is controlled Transmitting module 103 processed generates transmitting pulse, and excitation ultrasonic probe 102 emits ultrasonic wave;After the completion of transmitting, receiving module 103 is right The ultrasonic echo that ultrasonic probe 102 receives carries out analog-to-digital conversion, and digital echo signal is transmitted to echo data processing module 105 It is handled;After the completion of processing, image data is sent to display module 107 and is shown.Wherein, controller 106 is using the present invention Wide sound field ultrasonic imaging method into line width sound field parameters calculate, and control transmitting module 103 into line width sound field emit.

The width sound field ultrasonic imaging method flow chart is as shown in figure 3, do further this method with reference to Fig. 3, Fig. 5 Explanation.

Wide sound field ultrasonic imaging method includes the following steps:

301. establish rectangular coordinate system by the origin of rectangular coordinate system of the center of ultrasonic probe, according to institute on ultrasonic probe There is the relative position relation of array element and ultrasonic probe center, calculates the rectangular co-ordinate of all array elements of ultrasonic probe;Without loss of generality, Take objects of the transmitting array element D as computation delay on ultrasonic probe surface 501;The rectangular coordinate system is according to ultrasonic probe spy Sign point is established, and the ultrasonic probe characteristic point is that linear array probe center, the convex array probe center of circle, convex array probe vertex or phased array are visited Head center;

302. radiation patterns set according to supersonic imaging device, calculate starting point A and the direction of transmitting, establish launch party To vector n;Direction of the launch vector n is directed toward ultrasonic probe focus B, direction of the launch vector n by transmitting starting point A along the direction of the launch Can be vertical with detecting head surface, it can not also be vertical;The transmitting starting point A is to calculate emission delay reference point, transmitting starting point A Can be in detecting head surface, it can not also be in detecting head surface;

303., according to the depth of focus FocusDepth for emitting starting point A and supersonic imaging device, it is burnt to calculate ultrasonic probe Point coordinates focus B;

304. establish the vector that the array element D for participating in transmitting is directed toward from ultrasonic probe focus B, calculate the modulus value Dist of the vector And the angle theta between the vector and direction of the launch vector;

305., according to angle theta, sound field ceofficient of spread k and velocity of sound c, calculate the emission delay DelayTime of array element:

DelayTime=[FocusDepth* (k/cos θ+1-k)-Dist]/c+OffsetTime

Wherein, it is transmitting group delay that k, which is more than 0 and is less than 1, OffsetTime, and occurrence is determined by supersonic imaging device;

306. emit according to the emission delay of calculating into line width sound field, and obtain ultrasonoscopy.

The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.

Claims (4)

1. a kind of wide sound field imaging method of supersonic imaging device, which is characterized in that the described method comprises the following steps:
A. rectangular coordinate system is established by the origin of rectangular coordinate system of the center of ultrasonic probe, according to all battle arrays on ultrasonic probe The relative position relation of member and ultrasonic probe center calculates the rectangular co-ordinate of all array elements of ultrasonic probe;
B. the radiation pattern set according to supersonic imaging device, calculates starting point and the direction of transmitting, establishes direction of the launch arrow Amount, direction of the launch vector are directed toward ultrasonic probe focus by transmitting starting point along the direction of the launch;
C. according to the depth of focus FocusDepth of transmitting starting point A and supersonic imaging device, calculate ultrasonic probe focus B's Coordinate;
D. the vector for being directed toward the array element for participating in transmitting from ultrasonic probe focus is established, the modulus value Dist of the vector is calculated and is somebody's turn to do Angle between vector and direction of the launch vector;
E. according to angle, sound field ceofficient of spread k and velocity of sound c, the emission delay DelayTime of array element is calculated:
DelayTime=[FocusDepth* (k/cos+1-k)-Dist]/c+OffsetTime
Wherein, it is transmitting group delay that k, which is more than 0 and is less than 1, OffsetTime, and occurrence is determined by supersonic imaging device;
F. emitted into line width sound field according to the emission delay of calculating, and obtain ultrasonoscopy.
2. the wide sound field imaging method of supersonic imaging device according to claim 1, it is characterised in that:The ultrasonic probe For linear array probe, convex array probe or phased array probe.
3. the wide sound field imaging method of supersonic imaging device according to claim 1, it is characterised in that:The transmitting starting Point is the reference point for calculating emission delay.
4. the wide sound field imaging method of supersonic imaging device according to claim 1, the sound field ceofficient of spread k characterization sound The broadening degree of field, it is characterised in that:When k tends to 1, transmitting sound field approaches plane wave;When k tends to 0, transmitting sound field approach point is poly- It is burnt.
CN201710592696.5A 2017-07-19 2017-07-19 A kind of wide sound field imaging method of supersonic imaging device CN107402388B (en)

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