CN202512241U - Ultrasonic probe space position and three-dimensional pose detection device - Google Patents
Ultrasonic probe space position and three-dimensional pose detection device Download PDFInfo
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- CN202512241U CN202512241U CN2012200755421U CN201220075542U CN202512241U CN 202512241 U CN202512241 U CN 202512241U CN 2012200755421 U CN2012200755421 U CN 2012200755421U CN 201220075542 U CN201220075542 U CN 201220075542U CN 202512241 U CN202512241 U CN 202512241U
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Abstract
The utility model provides an ultrasonic probe space position and three-dimensional pose detection device. The device comprises an ultrasonic coupling pad in which reflective particles are embedded and an additional probe group composed of a number of high frequency positioning ultrasonic transducers. The ultrasonic coupling pad in which reflective particles are embedded comprises an ultrasonic coupling pad base and reflective particles which are embedded in the ultrasonic coupling pad base. According to the utility model, the additional probe group emits high frequency positioning ultrasonic to the ultrasonic coupling pad and receives echo reflected by reflective particles whose precise space positions are known in the ultrasonic coupling pad. According to the round-trip propagation time of the high frequency positioning ultrasonic, the space position of the additional probe group is calculated, and the space position of an ultrasonic probe is further determined. Combined with the tilt angle of the ultrasonic probe, the three-dimensional pose of the ultrasonic probe is determined. The ultrasonic probe space position and three-dimensional pose detection device provided by the utility model has the advantages of simple structure, strong anti-interference, accurate positioning, simple algorithm, easy compatibility with the existing ultrasonic detection equipment and strong versatility.
Description
Technical field
The utility model relates to the ultrasonic listening technology, is specifically related to the pick-up unit of a kind of ultrasonic probe locus and 3 d pose.
Background technology
Over nearly 20 years; Progress along with science and technology; The particularly development of computer technology and Digital Signal Processing; The medical ultrasound imaging technique all has tremendous development at aspects such as probe exploitation, signal Processing and clinical practice softwares, makes the ultrasonic imaging quality significantly improve, and range of application is also more and more wider.Ultrasound wave has stronger penetration power; And have and organized not damaged, advantage such as radiationless surveying; Therefore have a wide range of applications at aspects such as medical treatment, industry, the energy, archaeologies; Particularly at medical field, the clinical diagnosis of aspects such as fetus, human body soft tissue, tumor of breast, ICT there is irreplaceable status.
Though ultrasound imaging techniques has had tremendous development in application, its image quality is not high, and the fusion of image, three-dimensional reconstruction and visual difficulty are big.At present; The 3-D data collection method of ultrasonic imaging mainly contains following two big types: first kind method is by machinery, electromagnetism and other device; The three-dimensional motion attitude of record ultrasonic probe when obtaining detection data; Thereby obtain the section of the known two dimensional image of a series of relative tertiary locations, and compositing 3 d images thus; Second class methods are to adopt the two-dimensional array probe, use electronically controlled mode to realize the focusing of ultrasound beamformer in the space, directly gather three-dimensional data.Said first kind method can be divided into arm-type and free arm-type these the two kinds of forms of non-freedom again; The arm-type volume sonde-type that is called again of wherein non-freedom; Its implementation is that design one cover mechanical hook-up driving probe moves with projected path; Probe is acquisition of image data in motion, and the probe movement mode can be translation, rotation or swing etc.Common Voluson 730 systems that develop of GE company and Kretz company like the U.S.; What this system adopted is linear sweep fixation locus Sampling techniques; In a special vector face battle array probe, micromachine is installed, drives ultrasonic probe through this mechanical hook-up and on two mutual vertical direction, carry out fan-shaped oscillatory scanning.In addition; The Rotation system of the TomTec company exploitation of Germany then adopts rotation sweep fixation locus Sampling techniques; This system is fixed on ultrasonic probe on the mechanical arm of being furnished with step motor, drives ultrasonic probe by mechanical arm and carries out the equal angles rotation sweep.Based on the arm-type method of freedom then is the sensor that on probe, installs an ability inductive probe locus and 3 d pose additional; Make the operator can move freely probe and come acquisition of image data; Sensor has various ways such as machinery, acoustics and electromagnetism; What adopt like the Echo-Scan system of the Tomtec company of Germany exploitation is the electromagnetic location sensing technology, and this system can write down the locus and the common six-freedom degree parameter of 3 d pose of ultrasonic probe.No matter all there is following problem in the free arm-type or free arm-type probe of right and wrong in experimental study and clinical practice: the one, instrument and equipment is complicated, comprises two-dimensional ultrasonic imaging and three-dimensional reconstruction two cover systems; The 2nd, versatility is not strong, and a certain equipment can only be checked a certain specific position; The 3rd, equipment is subject to disturb, and environment for use is required high.Said second class methods then are based on Huygens' principle; Utilize the method control two-dimensional array probe of phased array to launch synthetic ultrasound beamformer with spatial direction property; Target is carried out stereoscanning and realized the three-dimension space image data acquisition, constitute pyramidal 3-D view.Its representative products is the SSD-ALPHA system of the ALOKA company exploitation of Japan.The advantage of this kind equipment is to have avoided using the burdensome probe detent mechanism of a cover, and is easy to operate, can fast and stable ground image data, and image taking speed is fast, and particularly suitable and inspection to dynamic organs such as hearts.But; Thing followed problem is that port number increases sharply, and supposes that the square array element of popping one's head in by 64 * 64 constitutes, and port number has just reached 4096; The fast emission of ultrasonic beam and reception exist complex sensing device and signal Processing, not only technical sophistication and it costs an arm and a leg.In addition, it is still unresolved that also there are critical problems such as field of view is little, spatial resolution is limited in this type systematic.
Sum up and existingly obtain the method for view data, mainly have following problem through record ultrasonic probe locus and 3 d pose:
(1) with regard to the arm-type volume of non-freedom is popped one's head in, complicated in mechanical structure, equipment heaviness; All kinds of probes are difficult for connecting, and versatility is poor; Equipment relies on operator's experience and professional standards, is inconvenient to popularize and promote.
(2) with regard to the arm-type probe of freedom, at first need complicated probe sensing and the detent mechanism of a cover, equipment is huge; System is subject to the interference of extraneous acoustics, electromagnetism or others and influences image quality, and it is high to cause it that environment for use is required.
(3) be that system that the arm-type system of free arm-type or non-freedom all needs two-dimensional imaging and probe positions and 3 d pose to detect this two covers complicacy works simultaneously, could realize 3-D data collection, technical difficulty is big, complex equipments.
The utility model content
The utility model purpose is to overcome existing the detection and the method for record ultrasonic probe three-dimensional motion attitude and locus and many deficiencies that technology exists, and proposes the pick-up unit of a kind of ultrasonic probe locus and 3 d pose.
Said device comprises the ultrasound wave coupling pad of embedded reflection grain and the additional probes group that is made up of some high frequencies location ultrasonic transducer; The ultrasound wave coupling pad of said embedded reflection grain comprises ultrasound wave coupling pad base and the reflection grain that is embedded in the ultrasound wave coupling pad base, and said high frequency location ultrasonic transducer is the ultrasonic transducer that transmission frequency is higher than said ultrasonic probe.During detection the additional probes group is installed on the ultrasonic probe; The additional probes group is to the ultrasound wave coupling pad emission high frequency location of embedded reflection grain ultrasound wave; Locate the echo information that the reflection grain of ultrasound wave known accurate locus in ultrasound wave coupling pad reflects through receiving this high frequency; Calculate the locus of additional probes group; And then utilize the fixed position of additional probes group and ultrasonic probe to concern, and confirm the locus of ultrasonic probe, the 3 d pose of ultrasonic probe is confirmed at the pitch angle that combines the relative ultrasound wave coupling of ultrasonic probe to fill up again; Be embodied as the different ultrasonographies that constantly obtain and set up a coordinate system outside, common, thereby reach the purpose that the ultrasound wave 3 d image data is gathered.
In the pick-up unit as above-mentioned a kind of ultrasonic probe locus and 3 d pose; Said ultrasound wave coupling pad base adopts hierarchical design; Comprise two-layer more than; The one deck that contacts with ultrasonic probe during work is an outermost layer, with ultrasonic probe the position that will survey or tissue contact one deck be innermost layer, being coupled at ultrasound wave, more than one zone is embedded with reflection grain between the pad base adjacent layer; Projections of all zones that are embedded with reflection grain layer plane outside ultrasound wave coupling pad base just are paved with layer plane outside this, and all to be embedded with the projection of zone layer plane outside this of reflection grain not overlapping; Said zone between all said adjacent layers all scribbles the membraneous material layer, and each regional membraneous material acoustic impedance characteristic is different; The reflection grain of diverse location adopts the material of different acoustic impedance characteristics in the same area between ultrasound wave coupling pad base adjacent layer; The velocity of sound that ultrasound wave is propagated between reflection grain and said outermost layer is consistent.
As the prioritization scheme of the pick-up unit of above-mentioned a kind of ultrasonic probe locus and 3 d pose, said reflection grain adopts arranged in arrays between ultrasound wave coupling pad base adjacent layer.
As the prioritization scheme of the pick-up unit of above-mentioned a kind of ultrasonic probe locus and 3 d pose, said array is the array that dot matrix, linear array, dotted line combine.
As the prioritization scheme of the pick-up unit of above-mentioned a kind of ultrasonic probe locus and 3 d pose, said outermost material is harder than innermost layer material.The one deck that contacts with ultrasonic probe during work is an outermost layer, and its quality is harder, and purposes is to guarantee that reflection grain and the surperficial distance of ultrasound wave coupling pad that ultrasound wave is coupled in filling up remain unchanged; With ultrasonic probe the position that will survey or tissue to contact one deck be innermost layer; Innermost layer and ultrasonic probe position or the tissue that will survey contact; Its quality is softer; Make it carry out bending, guarantee ultrasound wave coupling pad and surveyed good coupling between the position according to the surface configuration of being surveyed the position.
As the prioritization scheme of the pick-up unit of above-mentioned a kind of ultrasonic probe locus and 3 d pose, ultrasound wave coupling pad base adopts two-layer design, and reflection grain is arranged in the same plane parallel with ultrasound wave coupling pad base superficies.
Prioritization scheme as the pick-up unit of above-mentioned a kind of ultrasonic probe locus and 3 d pose; When ultrasonic probe is common linear array probe or convex array probe; The number of said high frequency location ultrasonic transducer is more than 2; When ultrasonic probe was popped one's head in for the face battle array, the number of said high frequency location ultrasonic transducer was more than 3.
In the said apparatus; The reflection grain of diverse location is selected the material of different acoustic impedance characteristics in the same area between ultrasound wave coupling pad base adjacent layer; Therefore the additional probes group is after receiving the ultrasonic echo that is reflected by reflection grain; Can judge the acoustic impedance of corresponding reflection grain according to these echo information, and then confirm each Shu Huibo by which concrete reflection grain is reflected, thereby these echoes and corresponding reflection grain are mapped one by one.Simultaneously, the size of reflection grain should reduce as far as possible, guarantees that it does not impact the ultrasonic probe ultrasonic waves transmitted, and then influences final image quality.When the outer layout of ultrasound wave coupling pad base reflection grain array; The distance of guaranteeing all reflection grains and ultrasound wave coupling pad base superficies is known determined value, and reflection grain is arranged in the same plane parallel with ultrasound wave coupling pad base superficies usually.
The detection method of above-mentioned detection device, specifically: the outermost layer of ultrasound wave coupling pad is contacted with ultrasonic probe, innermost layer and ultrasonic probe the position that will survey or organize contact; The additional probes group is installed on the ultrasonic probe; And high frequency location ultrasonic transducer contacts with ultrasound wave coupling pad outermost layer; The additional probes group is to ultrasound wave coupling pad emission high frequency location ultrasound wave; And receive echo by the reflection grain reflection of known accurate locus in the ultrasound wave coupling pad, locate the locus that hyperacoustic round trip propagation time calculates the additional probes group according to high frequency, and then utilize the fixed position relation of additional probes group and ultrasonic probe; Confirm the locus of ultrasonic probe, the 3 d pose of ultrasonic probe is confirmed at the pitch angle that combines the relative ultrasound wave coupling of ultrasonic probe to fill up again.
The optimal technical scheme of above-mentioned detection method specifically comprises the steps:
Step 1 is confirmed the volume coordinate of each high frequency location ultrasonic transducer in the additional probes group, and the detection of any high frequency location ultrasonic transducer includes following steps:
(1) high frequency location ultrasonic transducer is used for the high frequency location ultrasound beamformer of region decision to the emission of ultrasound wave coupling pad; This wave beam is reflected by a kind of membraneous material in the ultrasound wave coupling pad; Judge this zone of high frequency location ultrasonic transducer on ultrasound wave coupling pad according to the echo of reflection, this zone is the projection of this membraneous material at ultrasound wave coupling pad outermost surface;
(2) the said high frequency of step (1) location ultrasonic transducer is launched the high frequency location ultrasound wave that is used to judge ultrasonic transducer exact position, high frequency location in the zone to ultrasound wave coupling pad; This high frequency location ultrasound wave is reflected by the reflection grain in the said membraneous material of step (1) region; And constantly received by high frequency location ultrasonic transducer in difference; The different echo information that reflect according to different reflection grains are judged the acoustic impedance of corresponding reflection grain; And then confirm each Shu Huibo by which concrete reflection grain is reflected, thereby these echoes and corresponding reflection grain are mapped one by one;
(3) transmit and receive mistiming and the velocity of propagation of high frequency location ultrasound wave in ultrasound wave coupling pad that the high frequency that is used for judging the exact position is located ultrasonic signal according to high frequency location ultrasonic transducer; Try to achieve this high frequency and locate the distance between the reflection grain of ultrasonic transducer and each known spatial locations, the method for utilizing three balls to cross is obtained the volume coordinate of this high frequency location ultrasonic transducer;
Step 2, basis obtain the volume coordinate of each high frequency location ultrasonic transducer, confirm the volume coordinate of additional probes group, and then utilize the fixed position relation of additional probes group and ultrasonic probe, confirm the locus of ultrasonic probe;
When step 3, a certain reflection grain when ultrasonic probe ultrasonic waves transmitted wave front is coupled pad through ultrasound wave in; The particle ultrasound wave that partly is reflected is reflected back; Echo information according to reflection grain reflects is judged the acoustic impedance of this reflection grain, and then confirms this Shu Huibo by which concrete reflection grain is reflected; According to the known spatial positional information of this reflection grain and the locus of ultrasonic probe, calculate the pitch angle of the relative ultrasound wave coupling of ultrasonic probe pad then, and then try to achieve the 3 d pose of ultrasonic probe.
In the above-mentioned detection method; The acoustic impedance of this kind membraneous material is calculated in the decay of the echo of foundation reflection in the step (1); And then confirm each Shu Huibo by which regional membraneous material is reflected, and then confirm this high frequency location ultrasonic transducer zone on ultrasound wave coupling pad.
The ultrasound examination of the achievement of the utility model on being used in medical treatment, also be applicable to fields such as machinery, pipeline, boats and ships and archaeology.
Compared with prior art, the utlity model has following advantage and technique effect:
(1) mode that adopts the additional probes group to combine with ultrasound wave coupling pad, the location is accurate, algorithm is simple, can detect the locus and the three-dimensional motion attitude of ultrasonic probe rapidly and accurately.
(2) on existing supersonic imaging apparatus basis, add ultrasound wave coupling pad; Owing to increased the position coordinates of the search coverage of priori; So can realize accurate registration, fusion and three-dimensional reconstruction, thereby expanded images visual field greatly for several ultrasonographies.
(3) just on ultrasonic probe, install one group of simple additional probes group additional, easy and existing ultrasonic listening equipment matches highly versatile.
(4) do not receive interference such as sound field, magnetic field, the environment that detects is not had extra requirement.
(5) simple in structure cost of development is low flexibly, is easy to popularize and promote.
Description of drawings
Fig. 1 is the ultrasound wave coupling pad and the additional probes group work synoptic diagram of the said embedded reflection grain of the utility model.
Fig. 2 is the ultrasound wave coupling pad cross-sectional view of the said embedded reflection grain of the utility model.
Fig. 3 a is the point reflection array of particles of arranged in concentric circles and the arrangenent diagram in different membraneous materials zone.
Fig. 3 b is the linear reflection array of particles of orthogonal thereto layout and the arrangenent diagram in different membraneous materials zone.
Fig. 3 c is some line structure reflection grain array and the regional arrangenent diagram of different membraneous materials that interleaved is arranged.
Fig. 4 is locus and the three-dimensional motion attitude detection process flow diagram that ultrasound wave coupling pad and additional probes group are confirmed ultrasonic probe.
Fig. 5 is a synoptic diagram of being confirmed the probe positions coordinate by embedded reflection grain.
Fig. 6 is a synoptic diagram of being confirmed head angle by embedded reflection spot linear array.
Fig. 7 a is the synoptic diagram that the mistiming produces when implementing detection.
Fig. 7 b is the synoptic diagram that time window is set.
Embodiment
Be described further below in conjunction with the practical implementation of accompanying drawing the utility model, but below be merely instance, the enforcement and the protection domain of the utility model are not limited thereto.
As shown in Figure 1, be the ultrasound wave coupling pad and the additional probes group work synoptic diagram of embedded reflection grain.The pick-up unit of ultrasonic probe locus and 3 d pose; Comprise the ultrasound wave coupling pad of embedded reflection grain and the additional probes group that constitutes by some high frequencies location ultrasonic transducer, during work with ultrasound wave coupling pad cover ultrasonic probe position or the tissue surface that will survey.In this embodiment, surface and the ultrasound wave coupling pad 102 of being surveyed tissue 101 are planar structure, and embedded reflection grain 103 is made up of the reflection spot that adopts arranged in arrays.The upper surface that this ultrasound wave coupling is filled up promptly is superficies, also is the ultrasonic probe surface of contact simultaneously, contacts with ultrasonic probe during work, and lower surface promptly is the internal layer surface, also is tissue contact surface simultaneously, contacts during work with by the detection tissue surface.Additional probes group 104 is fixed on the both sides of ultrasonic probe 105; Consistent on the high frequency location ultrasound beamformer that will guarantee additional probes group emission during installation and the ultrasonic probe ultrasonic waves transmitted wave beam maintenance direction guarantees accurately to find the solution the three-dimensional motion attitude of ultrasonic probe.
As shown in Figure 2, be the cross-sectional view of an embodiment of said ultrasound wave coupling pad.This ultrasound wave coupling pad is made up of with linear reflection particle 202 the sheet base of ultrasound wave coupling pad and embedded point-like reflection grain 201.The sheet base of ultrasound wave coupling pad adopts hierarchical design, and its ectomesoderm 203 is that quality is harder, the distance on inner reflection spot linear array and ultrasound wave coupling pad surface
dRemain unchanged.Internal layer 204 quality are softer, guarantee coupling piece and surveyed good coupling between the tissue, and this layer is thicker relatively.The skin and the internal layer of coupling piece sheet base are all selected the entrant sound resin material for use, to guarantee carrying out bending according to the surface configuration of being surveyed tissue, guarantee the ultrasound wave homogeneity and the consistance of portion's acoustic speed of propagation within it simultaneously.The membraneous material 205 of different acoustic impedance characteristics all is coated with and is contained in plane, reflection grain place, helps the identification of high frequency location ultrasonic transducer to different reflection grains like this.
The ultrasound wave coupling pad of the different membraneous materials of each regional application and reflection grain are shown in Fig. 3 a, Fig. 3 b, Fig. 3 c; Wherein, Different membraneous material zones mark with different backgrounds, and the pattern of reflection grain can be that (Fig. 3 a), linear array (Fig. 3 b) and dotted line combine the arrangement form of (Fig. 3 c), selects flexibly according to concrete acquisition environment during use for dot matrix; For the ultrasonic equipment of dissimilar and frequency, serve as to select foundation with being easy to demarcate probe not influence image quality.
As shown in Figure 4, be that the ultrasound wave coupling pad that utilizes embedded reflection grain that the utility model proposes is confirmed the locus and the three-dimensional motion attitude of ultrasonic probe with the additional probes group, and then realize the system chart that the ultrasound wave 3 d image data is gathered.Specifically may further comprise the steps.
(1) certain the high frequency location ultrasonic transducer in the additional probes group is used for the high frequency location ultrasound beamformer of region decision to the emission of ultrasound wave coupling pad.Ultrasonic probe sees through ultrasound wave coupling pad to being surveyed the tissue emission ultrasound wave and obtaining the two-dimensional slice image data of being surveyed tissue simultaneously.During work,, make its ultrasonic waves transmitted in ultrasound wave coupling pad, have great decay and can't arrive to be surveyed and organize through control to high frequency location supersonic transducer frequency and power, thus avoid and ultrasonic probe between the phase mutual interference.
(2) the high frequency location ultrasound wave that is used for region decision is had different acoustic impedance characteristics between ultrasound wave coupling pad skin and the internal layer membraneous material reflects; According to the ultrasound information that reflects; With the mapping relations reference mutually between membraneous material of having set up and the attenuation coefficient, judge this ultrasonic transducer region, high frequency location.
According to the snell law that ultrasound wave is propagated in different medium, adopt the sound pressure reflection coefficient method can calculate the attenuation degree of high frequency location ultrasound wave in different membraneous materials, thereby set up the mapping relations between selected membraneous material and the attenuation coefficient.Through the reflection echo that receives; Measure the decay of high frequency location ultrasound wave in different membraneous materials of high frequency location ultrasonic transducer emission; Contrast said mapping relations; Confirm the high frequency location membraneous material that ultrasound wave shone of this high frequency location ultrasonic transducer emission, and then confirm this ultrasonic transducer group region, high frequency location according to irradiated membraneous material region.
(3) after the zone on confirming this ultrasonic transducer place, high frequency location ultrasound wave coupling pad, this high frequency location ultrasonic transducer is used for the high frequency location ultrasound wave that the exact position is judged in the zone to the emission of ultrasound wave coupling pad.The high frequency location ultrasound wave that is used for judging the exact position is reflected by the reflection grain in this zone, and is received by high frequency location ultrasonic transducer constantly in difference.Different echo information according to different reflection grains reflect are judged the acoustic impedance of corresponding reflection grain, and then confirm each Shu Huibo by which concrete reflection grain is reflected, thereby these echoes and corresponding reflection grain are mapped one by one.
Transmit and receive mistiming and the velocity of propagation of high frequency location ultrasound wave in ultrasound wave coupling pad that the high frequency that is used for judging the exact position is located ultrasonic signal according to high frequency location ultrasonic transducer, just can be in the hope of the distance between this high frequency location ultrasonic transducer and each known spatial locations reflection grain.The method of utilizing three balls to cross just can be obtained the volume coordinate of this high-frequency transducer.
In like manner can be in the hope of the volume coordinate of other high-frequency transducer through above step, thus obtain constituting the volume coordinate of all high frequencies location ultrasonic transducers of additional probes group, and then the volume coordinate of definite additional probes group.And then utilize the fixed position relation of additional probes group and ultrasonic probe, just decided the locus of ultrasonic probe is unique.
(4) when a certain reflection grain of ultrasonic probe ultrasonic waves transmitted wave front process; The part ultrasound wave is reflected back; Utilize the echo information of this reflection grain, confirm to reflect earlier, then according to the locus of its known spatial positional information and ultrasonic probe by which concrete reflection grain; Just can calculate the pitch angle of the relative ultrasound wave coupling of ultrasonic probe pad, and then just can be in the hope of the 3 d pose information of ultrasonic probe.
Utilize the reflection echo of the membraneous material of zones of different the application zone of judging high frequency location ultrasonic transducer and the reflection echo that utilizes reflection grain to confirm the exact position of high frequency location ultrasonic transducer in the present embodiment; And the reflection echo that utilizes reflection grain confirms that the computing method of these three principles that step realized of pitch angle and employing of the relative ultrasound wave of ultrasonic probe coupling pad are similar; All be to utilize different materials to have different acoustic impedances, thereby confirm membraneous material type and reflection grain material type by different attenuation degrees.Simultaneously, the involved ultrasonic waves transmitted frequency of these three steps is different.Wherein, Confirm that the ultrasonic frequency of the exact position of high-frequency transducer using is the highest; Confirm that the ultrasonic frequency that use in the zone of high frequency location ultrasonic transducer takes second place, confirm that the ultrasonic frequency of the pitch angle of the relative ultrasound wave Coupling point of ultrasonic probe using is minimum.
(5) the two-dimensional slice image data of being surveyed tissue of utilizing ultrasonic probe to obtain in conjunction with the locus and the 3 d pose information of ultrasonic probe, just can realize being surveyed the 3 d image data collection of tissue.
As shown in Figure 5, be an example schematic confirming the probe positions coordinate through the emission particle in the ultrasound wave coupling pad.Be example with common linear array probe in the present embodiment, point
PWith
QTwo high frequency location ultrasonic transducers at the two ends of expression linear array probe.The reflection spot linear array adopts the arrangement form of lattice array,
dBe the outer field thickness of ultrasound wave coupling pad,
M 0 ,
M 1 ,
M 2 ,
M n Reflection grain for location aware.Supposition here
M 0 Be true origin, with two end points of linear array probe
PWith
QThe parallel lines direction of connecting line does
xAxle with ultrasound wave coupling piece hard layer vertical direction does
yAxle is set up rectangular coordinate system.
Be positioned at a little
PThe ultrasound wave that sends of high frequency location ultrasonic transducer through reflection spot
M 0 ,
M 1 ,
M 2 ,
M n The echo of reflection is received by this high frequency location ultrasonic transducer, can note the time that wave beam comes and goes to be respectively
t 0 ,
t 1 ,
t 2 ,
t n The speed of supposing ultrasound wave Es-region propagations outside ultrasound wave coupling pad does
v, then can calculate a little
PTo point
M 0 Distance be:
L 0 =vt 0 / 2, because the outer field thickness of ultrasound wave coupling pad
dKnown, so utilize Pythagorean theorem can be in the point of same vertical direction in the hope of laminar surface and reflection spot outside
R 0 With the point
PDistance
r 0 =0.5 (v 2 r 0 2 -4d 2 ) 1/2 So, the point
PThe position just at superficies with point
R 0 Be the center of circle, with distance
r 0 On the circle for radius.In addition,
PPoint is in respectively with point simultaneously
R 1 ,
R 2 ...,
R n Be the center of circle, with
r 1 ,
r 2 ...,
r n On the circle for radius.So as long as work as
N>3The time, the method that just can utilize many circles to cross is confirmed this high frequency location ultrasonic transducer loca
PThe position.In like manner can try to achieve another high frequency location ultrasonic transducer loca
QThe position.The locus of whole like this linear array probe has just been decided.
As shown in Figure 6, be an embodiment synoptic diagram confirming the probe 3 d pose through the reflection grain in the ultrasound wave coupling pad.Embodiment is the same among probe and reflected ray dot matrix and Fig. 5 in the present embodiment, is all common linear array probe, and reflection grain is the lattice array arrangement form.
With plane, reflection grain place is reference field, with one of them reflection grain
OFor true origin is set up rectangular coordinate system in space.Common linear array probe contacts with superficies, and the high frequency location ultrasonic transducer at two ends is respectively a little
PWith
QThe point
PWith
QAt face
XOyVertical projection be respectively a little
P 0 With
Q 0 And the point
PWith
QAt face
XOyThe projection of upper edge ultrasonic emitting direction (detection direction) is respectively a little
P t With
Q t Be located at a certain moment linear array probe along certain reflection grain of ultrasonic emitting direction (detection direction) projection line process
MOn the plane
XOyIn, through reflection spot
MMake line segment
PQParallel lines, pass through a little simultaneously
P 0 With
Q 0 Make straight line respectively
P 0 Q 0 Vertical line, then this is through point
MWith line segment
PQParallel straight line and two vertical lines intersect the intersection point that forms
P t With
Q t Be exactly a little
PWith
QAlong ultrasonic emitting direction (detection direction) at face
XOyOn subpoint.According to Fig. 5, we obtain a little
PWith
QCoordinate, and then can be according to point
PWith
QAt face
XOyVertical projection
P 0 With
Q 0 Coordinate obtain straight line
P 0 Q 0 Equation.Line segment then
P t P 0 Length is a little
MTo straight line
P 0 Q 0 Distance, can try to achieve its result according to the range formula of putting straight line, be made as its result
l, and line segment
P P 0 Length be outer field thickness
dSo, can try to achieve ∠
P P t P 0 Tangent
Tan θ=d/lSo, confirming two end points of probe
P,
QVolume coordinate and the inclination angle ∠ of the relative ultrasound wave of probe coupling pad
P P t P 0 After, the locus of linear array probe and 3 d pose have just been decided by unique.
And pop one's head in for two-dimensional array; As long as three high frequency location of floor plan ultrasonic transducer at ultrasound wave array element place; Through detecting the locus of three high frequency location ultrasonic transducers, just can confirm the locus and the three-dimensional motion attitude of two-dimensional array probe simultaneously.
Shown in Fig. 7 a, Fig. 7 b, be to eliminate 701 pairs of embodiment synoptic diagram that received influence by the detected object reflection wave of reflection grain.Shown in Fig. 7 a, line segment
PQBe common linear array probe 702.This probe sees through ultrasound wave coupling pad 703 to being surveyed tissue 704 emission ultrasound beamformers.
M i With
M j Two reflection grains that pass through for ultrasound beamformer sometime.Suppose that the velocity of propagation of ultrasound wave in ultrasound wave coupling pad does
v, then ultrasound beamformer is from linear array probe
PQSend, through the reflection grain
M i With
M j The time that reflection is received by probe again
t d =2d/v, from the ultrasound beamformer time that is reflected by the detected object organization internal
t l =2l/vBecause
L>dSo,
t l >t d , when a time span is set do
t d Time window, filter out 0 ~
t d During reflection wave in the time period, will shown in Fig. 7 b, eliminate the ultrasonic signal of reflection grain reflection fully, can keep the ultrasonic signal of being surveyed the tissue reflection simultaneously again fully.
Claims (7)
1. the pick-up unit of ultrasonic probe locus and 3 d pose; It is characterized in that comprising the ultrasound wave coupling pad of embedded reflection grain and the additional probes group that constitutes by some high frequencies location ultrasonic transducer; The ultrasound wave coupling pad of said embedded reflection grain comprises ultrasound wave coupling pad base and the reflection grain that is embedded in the ultrasound wave coupling pad base, and said high frequency location ultrasonic transducer is the ultrasonic transducer that transmission frequency is higher than said ultrasonic probe.
2. the pick-up unit of a kind of ultrasonic probe locus according to claim 1 and 3 d pose; It is characterized in that said ultrasound wave coupling pad base adopts hierarchical design; Comprise two-layer more than; The one deck that contacts with ultrasonic probe during work is an outermost layer, with ultrasonic probe the position that will survey or tissue contact one deck be innermost layer, being coupled at ultrasound wave, more than one zone is embedded with reflection grain between the pad base adjacent layer; Projections of all zones that are embedded with reflection grain layer plane outside ultrasound wave coupling pad base just are paved with layer plane outside this, and all to be embedded with the projection of zone layer plane outside this of reflection grain not overlapping; Said zone between all said adjacent layers all scribbles the membraneous material layer, and each regional membraneous material acoustic impedance characteristic is different; The reflection grain of diverse location adopts the material of different acoustic impedance characteristics in the same area between ultrasound wave coupling pad base adjacent layer; The velocity of sound that ultrasound wave is propagated between reflection grain and said outermost layer is consistent.
3. the pick-up unit of a kind of ultrasonic probe locus according to claim 2 and 3 d pose is characterized in that said reflection grain adopts arranged in arrays between ultrasound wave coupling pad base adjacent layer.
4. the pick-up unit of a kind of ultrasonic probe locus according to claim 1 and 3 d pose is characterized in that said array is the array that dot matrix, linear array, dotted line combine.
5. the pick-up unit of a kind of ultrasonic probe locus according to claim 1 and 3 d pose is characterized in that said outermost material is harder than innermost layer material.
6. the pick-up unit of a kind of ultrasonic probe locus according to claim 2 and 3 d pose; It is characterized in that ultrasound wave coupling pad base adopts two-layer design, reflection grain is arranged in the same plane parallel with ultrasound wave coupling pad base superficies.
7. the pick-up unit of a kind of ultrasonic probe locus according to claim 2 and 3 d pose; It is characterized in that when ultrasonic probe is common linear array probe or convex array probe; The number of said high frequency location ultrasonic transducer is more than 2; When ultrasonic probe was popped one's head in for the face battle array, the number of said high frequency location ultrasonic transducer was more than 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200755421U CN202512241U (en) | 2012-03-02 | 2012-03-02 | Ultrasonic probe space position and three-dimensional pose detection device |
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|---|---|---|---|
| CN2012200755421U CN202512241U (en) | 2012-03-02 | 2012-03-02 | Ultrasonic probe space position and three-dimensional pose detection device |
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| CN202512241U true CN202512241U (en) | 2012-10-31 |
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| CN2012200755421U Withdrawn - After Issue CN202512241U (en) | 2012-03-02 | 2012-03-02 | Ultrasonic probe space position and three-dimensional pose detection device |
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| CN (1) | CN202512241U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590814A (en) * | 2012-03-02 | 2012-07-18 | 华南理工大学 | Detection apparatus of ultrasonic probe space position and three-dimensional attitude and method thereof |
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2012
- 2012-03-02 CN CN2012200755421U patent/CN202512241U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590814A (en) * | 2012-03-02 | 2012-07-18 | 华南理工大学 | Detection apparatus of ultrasonic probe space position and three-dimensional attitude and method thereof |
| WO2013127094A1 (en) * | 2012-03-02 | 2013-09-06 | 华南理工大学 | Device and method for detecting spatial position and three-dimensional attitude of ultrasonic probe |
| CN102590814B (en) * | 2012-03-02 | 2014-04-02 | 华南理工大学 | Detection apparatus of ultrasonic probe space position and three-dimensional attitude and method thereof |
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