CN107402388A - 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
CN107402388A
CN107402388A CN201710592696.5A CN201710592696A CN107402388A CN 107402388 A CN107402388 A CN 107402388A CN 201710592696 A CN201710592696 A CN 201710592696A CN 107402388 A CN107402388 A CN 107402388A
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CN
China
Prior art keywords
sound field
transmitting
imaging device
ultrasonic probe
launch
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CN201710592696.5A
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Chinese (zh)
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CN107402388B (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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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88Sonar systems specially adapted for specific applications
    • G01S15/89Sonar systems specially adapted for specific applications for mapping or imaging
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01SRADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/52Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
    • G01S7/52003Techniques for enhancing spatial resolution of targets

Abstract

The present invention relates to a kind of wide sound field imaging method of supersonic imaging device, including:Rectangular coordinate system is established, calculates the rectangular co-ordinate of all array elements;Starting point and the direction of transmitting are calculated, establishes direction of the launch vector;According to transmitting starting point and the depth of focus, focal coordinates are calculated;The vector that the array element for participating in transmitting is pointed to from focus is established, calculates its modulus value and its angle between direction of the launch vector;According to angle, sound field ceofficient of spread and the velocity of sound, the emission delay of array element is calculated;The transmitting of line width sound field is entered according to the delay of calculating, and obtains ultrasonoscopy.The wide sound field imaging method of the present invention can be applied to 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 method of supersonic imaging device.

Background technology

Traditional ultrasonic device transmitting focusing typically uses point focusing, and focusing center is focus.Point focusing realization is simple, Sound field intensity is big in the range of burnt area, and imaging resolution is high;Outside Dan Jiao areas, imaging has distortion distortion.In order that whole field into As clearly, having also been proposed the mode of multifocal transmitting, repeatedly launched in same transmitting position, form multiple different depths 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 requiring that transmitting sound field can cover whole imaging region, emitting times are larger, and This can reduce image frame per second;Higher occasion is required to image frame per second at some, 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 special The method that wide sound field transmitting is proposed in profit, broadening launch sound field every time so that need to only launch fewer number can just cover entirely Imaging region, and then obtain frame per second height and the measured image of matter.

The existing method having pointed out can substantially be divided into two classes:One kind is the method broadening transmitting sound using hardware optimization , such as by launching main lobe to transmitting aperture adding window come broadening;One kind is to launch sound field by control passage delay come broadening, For example transmitting aperture is divided into several parts, each part individually focuses on, and forms multiple focuses of cross direction profiles, carrys out convergence sound field The effect of broadening.

Requirement of the first kind method to hardware is higher, 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 Suitable for the wide sound field launching technique of various situations.The method proposed at present is mostly just for certain particular case, 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 not deflecting the method for use. Although realizing the effect of broadening, the otherness between method can increase burden to controller.

The content of the invention

In view of this, it is a primary object of the present invention 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 applied to 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. the origin using the center of ultrasonic probe as rectangular coordinate system establishes rectangular coordinate system, owns according on ultrasonic probe Array element and the relative position relation at ultrasonic probe center, calculate 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 point to ultrasonic probe focus by transmitting starting point along the direction of the launch;

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

D. establish from ultrasonic probe focus point to 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, k is more than 0 and is less than 1, OffsetTime to launch group delay, and occurrence is determined by supersonic imaging device;

F. the transmitting of line width sound field is entered according to the emission delay of calculating, and obtains 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 sound field ceofficient of spread k characterizes the broadening degree of sound field, when k tends to 1, sound field convergence plane wave;When k tends to 0, Sound field convergence point focusing.

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

Brief description of the drawings

Fig. 1 is typical supersonic imaging device structural representation;

Fig. 2 a are typical point focusing schematic diagram;

Fig. 2 b launch schematic diagram for wide sound field of the present invention;

Fig. 2 c are that wide sound field when ceofficient of spread of the present invention tends to 1 launches 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 launching array element.

Embodiment

Below in conjunction with the accompanying drawings and embodiments of the invention are made to 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 with reference to accompanying drawing 2a, 2b and 2c.

Fig. 2 a are typical point focusing schematic diagram, and 201 refer to launching equiphase surface, and 202 refer to launching Jiao Qu.201 hairs It is one section of circular arc to penetrate equiphase surface, and the center of circle is to be in the focus in the range of 202 burnt areas because focus to equiphase surface meet etc. sound path, Therefore focal point sound field is applied enhancing, and near focal point region is also strengthened by different degrees of superposition, formd a bit of long and narrow Jiao Qu.According to Huygens-Fresnel principle, concentric circles equiphase surface of one group of center of circle in focus can be intuitively drawn.

Fig. 2 b launch schematic diagram for wide sound field of the present invention, and 203 refer to launching equiphase surface, and 204 refer to launching Jiao Qu.The present invention transmitting equiphase surface 203 with it is existing typically launch equiphase surface 201 difference be, 203 can be circular arc or Non- circular arc, it is more flat than 201, and this delay inequality represented between different transmitting array elements is reduced.According to Huygens-Fresnel It principle, can speculate in the range of the burnt area for launching burnt area 204 point to 203 grade sound paths no longer be present, the point in burnt area is by more Uniform superposition enhancing, what sound field was expanded more opens, and which forms the transmitting sound field of broadening.

Fig. 2 c are that wide sound field when ceofficient of spread of the present invention tends to 1 launches schematic diagram, the now delay such as convergence hair Penetrate, sound field broadening convergence plane wave.

The delay inequality reduced between transmitting array element is can be seen that from above-mentioned elaboration can make transmitting sound field broadening, here it is The basic point of departure of broadening sound field.

Then, wide sound field emission delay model of the present invention is elaborated with reference to Fig. 4.

In Fig. 4, O is transmitting starting point, and y-axis is the direction of the launch, and x-axis be to launch starting point and vertical with the direction of the launch Straight line, E for transmitting focus, I for transmitting array element, 401 be O point focusing circular arc equiphase surface, 402 be the phases such as O wide sound field Face, θ are EI and the angle of 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 Close.

In stating below, amount of delay is represented with path difference.According to elaboration above, when equiphase surface is transformed to 402 by 401 When, sound field will be broadened;402 need to keep symmetrical on 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 more than 0 less than 1;

Be apparent from, k level off to 0 when, 402 level off to 401, that is, launch convergence point focusing;K level off to 1 when, 402 level off to x Axle, that is, launch convergence plane wave.As can be seen that this broadening mode is unrelated with probe form from k definition, 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 emission delay amount DelayTime standardization:

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 focusing Depth, EI are distance of the focus to array element.

Below, the present invention is described in further details in conjunction with the embodiments.

A kind of supersonic imaging device that the present embodiment uses, its 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 Transmitter module 103 processed produces transmitting pulse, and excitation ultrasonic probe 102 launches 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 into echo data processing module 105 Handled;After the completion of processing, view data is sent to display module 107 and shown.Wherein, controller 106 is using the present invention Wide sound field ultrasonic imaging method enter line width sound field parameters calculating, and control transmitter module 103 enter line width sound field transmitting.

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

Wide sound field ultrasonic imaging method comprises the following steps:

301. origin using the center of ultrasonic probe as rectangular coordinate system establishes rectangular coordinate system, according to institute on ultrasonic probe There is the relative position relation of array element and ultrasonic probe center, calculate 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 special according to ultrasonic probe 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 summit 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 points to 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, can also out of plumb;The transmitting starting point A launches starting point A to calculate emission delay reference point Can be in detecting head surface, can not also be in detecting head surface;

303., according to transmitting starting point A and the depth of focus FocusDepth of 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 pointed to 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, calculates the emission delay DelayTime of array element:

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

Wherein, k is more than 0 and is less than 1, OffsetTime to launch group delay, and occurrence is determined by supersonic imaging device;

306. enter the transmitting of line width sound field according to the emission delay of calculating, 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. the wide sound field imaging method of a kind of supersonic imaging device, it is characterised in that the described method comprises the following steps:
A. the origin using the center of ultrasonic probe as rectangular coordinate system establishes rectangular coordinate system, according to all array elements on ultrasonic probe With the relative position relation at ultrasonic probe center, the rectangular co-ordinate of calculating 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 vector, Direction of the launch vector points to ultrasonic probe focus by transmitting starting point along the direction of the launch;
C. according to transmitting starting point A and the depth of focus FocusDepth of supersonic imaging device, ultrasonic probe focal coordinates are calculated B;
D. the vector that the array element for participating in transmitting is pointed to from ultrasonic probe focus is established, calculates the modulus value Dist and the arrow of the vector Angle theta between amount 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, k is more than 0 and is less than 1, OffsetTime to launch group delay, and occurrence is determined by supersonic imaging device;
F. the transmitting of line width sound field is entered according to the emission delay of calculating, and obtains 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 sign sound The broadening degree of field, it is characterised in that:When k tends to 1, launch sound field convergence plane wave;When k tends to 0, transmitting sound field convergence point gathers 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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