CN111436969A - High-frequency ultrasonic imaging equipment performance detection device - Google Patents
High-frequency ultrasonic imaging equipment performance detection device Download PDFInfo
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Abstract
The invention discloses a performance detection device of high-frequency ultrasonic imaging equipment, which comprises a body model shell, an acoustic window, a plurality of target lines (4), a plurality of simulated focuses (5) and a background tissue-imitating material; the phantom shell is of a cuboid structure and is formed by fixedly connecting a front panel (2), a rear panel (3), two side panels, a bottom panel and a water tank frame, the phantom shell and a sound window stuck in the water tank frame form a closed space together, and background tissue imitating materials are filled in the phantom shell; the bottom panel is provided with a plurality of inlets filled with background tissue-imitating materials, the target lines (4) and the simulated focuses (5) are embedded in the background tissue-imitating materials, and each target line vertically penetrates through the front panel (2) to the rear panel (3). The device of the invention can detect and evaluate the blind area, imaging resolution, detection depth, geometric position precision and focus discovery capability of high-frequency B ultrasonic equipment.
Description
Technical Field
The invention belongs to the field of quality detection of medical instruments, and particularly relates to a performance detection device of high-frequency ultrasonic imaging equipment.
Background
B-ultrasonic and X-CT, magnetic resonance imaging, nuclear medicine imaging are the four most practical diagnostic imaging techniques in the present day, and B-ultrasonic is the top of the four in terms of popularity. Particularly under specific conditions in China, the B-mode ultrasound technology is not only used for routine diagnosis of various diseases, but also is generally used in the fields of birth control, eugenics and reproductive health. The performance and quality of the Chinese characters are related to economic benefits of manufacturers and hospitals, and the health and the welfare of the whole Chinese nation including offspring and offspring are affected. In view of this, the national authorities have established and released the corresponding technical standards as legal compliance for their life-long quality supervision.
In clinic, doctors make diagnosis according to the information provided by the ultrasonic scanning sonogram, so the image quality is considered as the primary factor for measuring the quality of the B-ultrasonic product and judging whether the B-ultrasonic works normally or not. According to international consensus, the technical indicators (i.e. performance) characterizing the image quality include dead zone, depth of detection, axial (longitudinal) resolution, lateral (transverse) resolution, pitch resolution, contrast resolution, and geometric errors of display and measurement, etc. The material technical means which can make objective, rapid, vivid and quantitative evaluation on the performance and quality of the B ultrasonic equipment in all links of development, production, sale, use, maintenance and legal management (quality supervision and inspection, metrological verification, import and export commodity inspection) of the B ultrasonic equipment only has an imitated tissue ultrasonic phantom. The ultrasonic Tissue simulating Phantom is a human physical model which simulates soft Tissue in the aspect of ultrasonic propagation characteristics and is a passive testing device which is composed of an ultrasonic background Tissue-simulating material (TM material for short) and a plurality of testing targets embedded in the material, an acoustic window, a shell, an indicating decoration panel and the like. The tissue-imitated ultrasonic body model is specified equipment for executing national technical standards and metrological verification procedures, and has the characteristics of a standard device.
The tissue-imitated ultrasonic phantom belongs to a tissue substitute and is not a gauge in the meaning of metrology, cannot be calibrated or calibrated, but because the quality of ultrasonic diagnostic equipment is directly influenced, a gauge for regular detection and comparison is formed from the end of the last century and is recognized and followed by relevant fields.
The conventional B ultrasonic imaging equipment detection device has a plurality of problems, and in terms of used tissue simulating materials, a sound transmission medium used in ATS L individuals products does not belong to the tissue simulating materials in the aspects of sound velocity and sound attenuation characteristics, and a distorted result is obtained when the sound transmission medium is used for quality detection.
Disclosure of Invention
The invention aims to overcome the technical defects and provides a tissue phantom simulating device for detecting the performance of high-frequency ultrasonic imaging equipment, which is an ultrasonic passive device special for investigating the performance parameters and focus discovery capability of the high-frequency ultrasonic imaging equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a performance detection device of high-frequency ultrasonic imaging equipment comprises a phantom shell, an acoustic window, a plurality of target lines, a plurality of simulated lesions and a background tissue-imitating material; the phantom shell is of a cuboid structure and is formed by fixedly connecting a front panel, a rear panel, two side panels, a bottom panel and a water tank frame, the phantom shell and a sound window stuck in the water tank frame form a closed space together, and background imitation tissue materials are filled in the phantom shell; the bottom panel is provided with a plurality of inlets filled with background tissue-imitating materials, the target lines and the simulated focuses are embedded in the background tissue-imitating materials, and each target line vertically penetrates from the front panel to the rear panel.
As an improvement of the above apparatus, the apparatus further comprises: the phantom shell is fixedly connected with the base through a bottom panel.
As an improvement of the device, the phantom shell and the base are made of hard structural plastics.
As an improvement of the above device, the acoustic window is a 50 μm to 100 μm thick polyester film.
As an improvement of the device, the inlet on the bottom panel is a round hole arranged at the edge of the bottom panel, and is blocked by a blocking rubber, and the blocking rubber is a vacuum rubber.
As an improvement of the device, the background tissue-imitating material is a water-based polymer gel-based composite material, the background tissue-imitating material is maintained by a maintenance liquid, and the maintenance liquid is injected by a plugging rubber.
As an improvement of the device, a plurality of target line openings are formed at the corresponding positions of the front panel and the rear panel in the horizontal direction and are used for positioning the target lines; two ends of the target line are respectively fixed on the outer side surfaces of the front panel and the rear panel, and each target line has the same pulling force so that the nylon target line is uniformly tightened; the target line material is a nylon line with the diameter of 0.1mm-0.5 mm.
As an improvement of the above apparatus, the plurality of target lines includes: longitudinal target group, transverse target group, blind zone target group, axial resolution target group, lateral resolution target group and fine lateral resolution target group;
the longitudinal target group comprises a group of target lines which are arranged at equal intervals along a longitudinal central line, and the longitudinal distance between every two adjacent target lines is 10 mm;
the transverse target groups comprise a plurality of groups of target groups arranged on horizontal planes at different depths from the acoustic window, each group of target groups comprises a plurality of target lines which are transversely arranged at equal intervals, and the transverse distance between every two adjacent target lines is 10 mm;
the blind area target group comprises 7 target lines which are alternatively staggered in the horizontal direction, and the distances between each target line and the acoustic window are respectively 2mm, 3mm, 4mm, 5mm, 6mm, 7mm and 8 mm;
the axial resolution target group comprises a first axial resolution target group, a second axial resolution target group, a third axial resolution target group and a fourth axial resolution target group, a target line closest to the acoustic window in each target group is a central target line, four central target lines are respectively positioned at the positions 10mm, 30mm, 5mm and 70mm away from the acoustic window, the vertical distance between two adjacent target lines is 3mm, 2mm, 1mm and 0.5mm from the central target line in sequence, and the horizontal distance is 1 mm;
the lateral resolution target groups comprise a first lateral resolution target group, a second lateral resolution target group, a third lateral resolution target group and a fourth lateral resolution target group, and each target group is respectively positioned on a horizontal plane with the depth of 10mm, 30mm, 50mm and 70mm from the acoustic window; the horizontal distance between two adjacent target lines is 4mm, 3mm, 2mm and 1mm in sequence;
the fine lateral resolution target groups comprise a first fine lateral resolution target group, a second fine lateral resolution target group, a third fine lateral resolution target group and a fourth fine lateral resolution target group, and the four groups of target groups are respectively positioned on horizontal planes with the depths of 10mm, 30mm, 5mm and 70mm away from the acoustic window; each group of target groups consists of two target lines, and the linear distance between the two target lines is 0.5 mm.
As an improvement of the device, the simulated focus is a cylindrical structure, the cylindrical axis of the simulated focus is parallel to the target line, and two ends of the simulated focus are respectively connected with the inner side surfaces of the front panel and the rear panel; the simulated focus comprises a first cystic simulated focus, a second cystic simulated focus and a third cystic simulated focus which are alternately staggered in the horizontal direction, and the diameters of the three simulated focuses are increased and the distances between the three simulated focuses and the acoustic window are increased.
The invention has the advantages that:
1. the tissue-imitated phantom special for detecting the imaging performance of the high-frequency B-type ultrasonic imaging equipment is suitable for detecting the performance of the B-type ultrasonic equipment with the working frequency of 5-10 MHz, and is mainly used for clinically detecting thyroid, parathyroid, superficial lymph nodes, breasts, cavities and other superficial parts. The tissue-imitated body model can detect and evaluate the blind area, imaging resolution, detection depth, geometric position precision and focus discovery capability of B ultrasonic equipment;
2. compared with the prior similar products, the tissue-imitated body model is specially used for detecting and evaluating the axial and lateral resolution, the detection depth, the geometric position precision, the blind area and the focus discovery capability of the imaging performance of a plane or convex array high-frequency ultrasonic probe imaging device instrument; by the design of target line distribution, the detection of the axial resolution and the lateral resolution from the highest resolution to 0.5mm and the imaging detection of cystic lesions with the diameter of 2mm can be realized; in addition, the tissue-imitating body model has original maintainability, and the service life of the body model can be greatly prolonged by regular maintenance and injection maintenance.
Drawings
FIG. 1 is an external view of a performance testing device of a high-frequency ultrasonic imaging apparatus according to the present invention;
FIG. 2 is an internal perspective view of the performance testing device of the high-frequency ultrasonic imaging apparatus of the present invention;
FIG. 3 is a front cross-sectional view of a performance testing device of the high-frequency ultrasonic imaging apparatus of the present invention;
FIG. 4 is a diagram showing a target line and a distribution of a simulated focus of a performance testing apparatus of a high-frequency ultrasonic imaging device according to the present invention;
FIG. 5 is a schematic diagram of a performance testing apparatus of a high-frequency ultrasonic imaging device according to the present invention, which uses a B-ultrasonic probe for performance testing.
Reference numerals
1. Imitating tissue phantom 2, front panel 3 and back panel
4. Target line 5, simulated focus 6 and fixing bolt
7. Round hole 8, plugging rubber 9 and background tissue-imitating material
10. Base 11, acoustic window 12, basin frame
13. Side panel 14, side panel antiskid groove 15, bottom panel
16. B-ultrasonic 17, B-ultrasonic probe 18, B-ultrasonic cable
401. Blind zone target group 411 and first lateral resolution target group
412. Second lateral resolution target group 413 and third lateral resolution target group
414. Fourth axial resolution target group 421 and first axial resolution target group
422. Second axial resolution target group 423 and third axial resolution target group
424. Fourth axial resolution target group 431 and first fine lateral resolution target group
432. A second fine lateral resolution target group 433 and a third fine lateral resolution target group
434. Fourth fine lateral resolution target group 440, longitudinal target group
451. A first transverse target group 452 and a second transverse target group
501. A first cystic simulated lesion 502 and a second cystic simulated lesion
503. Third cystic simulated lesion
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in FIG. 1, the invention provides a performance detection device for a high-frequency ultrasonic imaging device, which is applicable to performance detection of an ultrasonic imaging device with a working frequency of 5 MHz-10 MHz. The device is a Tissue-imitating body model 1, which mainly comprises a body model shell, an acoustic window 11, a target line 4, an imitating focus 5 and a background Tissue-imitating Material 9 (TMM). The phantom housing is of a cuboid structure and comprises a front panel 2, a rear panel 3, two side panels 13, a bottom panel 15 and a water tank frame 12. The phantom shell is arranged on the base 10, and the phantom shell and the base are both made of hard structural plastic, preferably organic glass (PMMA, the chemical name of which is polymethyl methacrylate) and ABS, the chemical name of which is acrylonitrile-butadiene-styrene polymer plastic or polyvinyl chloride material. The water tank frame 12 is adhered with an acoustic window 11, the phantom shell and the acoustic window 11 form a closed space, and the inside is filled with a background tissue imitating material 9. The acoustic window 11 is made of a polyester film material with the thickness of 50-100 microns and is used for simulating the acoustic characteristics of human epidermal tissues.
As shown in fig. 2 and 3, a plurality of target line openings are formed at corresponding positions of the front panel 2 and the rear panel 3 in the horizontal direction for positioning the target lines 4, and the target lines having the same measurement purpose are collectively called a target group. The target line material is the nylon wire of diameter 0.1mm-0.5mm, and each target line all runs through to rear panel 3 from front panel 2 perpendicularly, and the lateral surface of upper panel and lower panel is fixed respectively at the target line both ends, and every target line has the same pulling force so that the nylon target line is evenly tightened. The target line position and the size of the hole are machined by a precision numerical control machine tool so as to ensure the precision of the positioning and the spacing of the hole. The side panel 13 is used as a part of the phantom housing, and the inner side surface of the side panel is provided with a side panel anti-slip groove 14 which is a concave notch machined on the inner side surface of the side panel and is used for preventing the background tissue imitating material 9 from sliding in the phantom housing 3.
As shown in FIG. 2, the bottom panel 15 has a plurality of circular holes 7 formed on its periphery for filling the background tissue-imitating material 9. The round hole 7 is plugged by a plugging rubber 8 with excellent elasticity, the function of the round hole is as an injection and air suction inlet when the background tissue-imitating material 9 is maintained, and the material of the plugging rubber 8 is a vacuum rubber. The bottom panel 15 of the phantom housing is fixedly connected with the base 10 through the fixing bolts 6 near the corners of the bottom panel, and the fixing device is used for connecting and fixing the fixing bolts 6 machined at the corresponding positions of the bottom panel and the supporting plate. The base 10 serves to support and hold the phantom steady to the tissue-mimicking phantom.
The background tissue-imitating material 9 is a material for imitating acoustic parameters of human soft tissues, the material is a water-based polymer gel matrix composite material, the sound velocity of the ultrasonic tissue-imitating material (TMM) is (1540 +/-10) m/s, the slope of the acoustic attenuation coefficient is (0.70 +/-0.05) dB/(cm.MHz) or (0.50 +/-0.05) dB/(cm.MHz), and the parameters of the background tissue-imitating material are values measured under the condition that the temperature is [ (23 +/-3) DEG C ].
The background tissue-imitating material 9 is a core part of the ultrasonic tissue-imitating phantom, and the functional failure is caused by the variation of the composition, the state and the acoustic characteristics of the core part, the tissue-imitating material of the ultrasonic tissue-imitating phantom has maintainability, liquid contained in the tissue-imitating material can be evaporated and lost through gaps of a shell of the phantom, the background tissue-imitating material can lose water and shrink after the phantom is used for a long time, and the phantom can be completely failed and cannot be recovered under the condition of serious water loss. The background tissue-imitating material can be maintained daily by using an aqueous maintenance solution, and the aqueous maintenance solution can be injected by using an injection needle through the plugging rubber 8; the aqueous maintenance liquid is dedicated to the background textured material. The daily maintenance period is related to the temperature and humidity environment of the phantom. The service life of the phantom can be greatly prolonged by daily supplementing of the aqueous maintenance liquid.
As shown in FIG. 4, the target wire 4 is embedded in the background tissue-imitating material 9, and both ends are fixed to the front panel 2 and the rear panel 3, respectively. The target lines are divided into different target groups according to different purposes, including a blind zone target group 401, a lateral resolution target group, an axial resolution target group, a fine lateral resolution target group, a longitudinal target group and a transverse target group, and the target line groups are arranged by taking the acoustic window 11 as a reference. The simulated focus 5 is a cylindrical structure, the cylindrical axis of the simulated focus is parallel to the target line 4, and the two ends of the simulated focus are respectively connected with the inner side surfaces of the front panel 2 and the back panel 3. The simulated focus 5 is embedded in a background tissue-imitated material 9, and the material of the simulated focus is a water-based gel matrix composite material. The simulated lesion 5 has different acoustic properties than the background tissue-mimicking material and therefore can contrast in the ultrasound image. The simulated lesion 5 is a cystic simulated lesion and acoustically appears as a posterior enhanced echo-free region. The simulated lesion 5 comprises a first cystic simulated lesion 501, a second cystic simulated lesion 502 and a third cystic simulated lesion 503 from near to far according to the distance from the acoustic window 11, wherein the diameter size of each simulated lesion is also from small to large, the smallest is the first cystic simulated lesion 501 closest to the acoustic window 11, the second cystic simulated lesion 502 is arranged next, and the largest is the third cystic simulated lesion 503 farthest from the acoustic window 11. Each simulating a lesion and being staggered alternately in horizontal position.
As shown in fig. 4, the blind spot target group 401 has 7 target lines in total, which are alternately shifted in the horizontal direction with the acoustic window 11 as a reference plane, and the distances between the target lines and the acoustic window 11 are 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, and 8mm, respectively, from the near side to the far side.
The lateral resolution target groups are several groups of target lines distributed horizontally, and comprise a first lateral resolution target group 411, a second lateral resolution target group 412, a third lateral resolution target group 413 and a fourth lateral resolution target group 414 from near to far from the acoustic window 11, wherein each target group is respectively positioned at the positions 10mm, 30mm, 50mm and 70mm away from the depth of the acoustic window 11, and the target groups are staggered alternately in the horizontal direction so as to avoid the shielding of the acoustic field. The horizontal distances of the centers of the target lines in each target line group are 4mm, 3mm, 2mm and 1mm in sequence.
The axial resolution target group is a target group in which target lines in the target group are distributed along the depth direction in sequence, the target group comprises a first axial resolution target group 421, a second axial resolution target group 422, a third axial resolution target group 423 and a fourth axial resolution target group 424 from near to far away from the acoustic window 11, the uppermost target line in each target group is a central target line and is located at the positions 10mm, 30mm, 5mm and 70mm away from the acoustic window 11, the vertical distance between the centers of the target lines in each target line group is 3mm, 2mm, 1mm and 0.5mm from top to bottom in sequence, and the horizontal distance is 1 mm.
The fine lateral resolution target groups are divided into 4 groups of target lines according to different distances from the acoustic window 11, and comprise a first fine lateral resolution target group 431, a second fine lateral resolution target group 432, a third fine lateral resolution target group 433 and a fourth fine lateral resolution target group 434, wherein the first fine lateral resolution target group, the second fine lateral resolution target group, the third fine lateral resolution target group and the fourth fine lateral resolution target group are respectively positioned at the same depth position with the lateral resolution target groups, and the four groups of target groups are respectively positioned at horizontal positions at positions with the distances of 10mm, 30mm, 5mm and 70mm from the acoustic window 11. Each group of target groups consists of two target lines, and the distance between the centers of the two adjacent target lines and the straight line between the two target lines is 0.5 mm.
The longitudinal target group 440 is a group of target lines arranged perpendicular to the acoustic window 11, and the distance between the centers of two adjacent lines is 10 mm.
The transverse target groups comprise a plurality of groups of target groups arranged on horizontal planes at different depths from the acoustic window 11, each group of target groups comprises a plurality of target lines which are transversely arranged at equal intervals, and the transverse distance between every two adjacent target lines is 10 mm; in this embodiment, the transverse target group comprises two groups of target lines parallel to the acoustic window 11: the first transverse target group 451 and the second transverse target group 452 are respectively positioned at the depth of 20mm and 40mm, and the distance between the centers of two adjacent lines is 10 mm.
The special body model for detecting the performance of the high-frequency B-type ultrasonic imaging equipment is a passive device which is specially used for detecting the performance of the high-frequency ultrasonic imaging equipment or the superficial ultrasonic imaging equipment and inspecting the evaluation of the focus discovery capability of the high-frequency B-type ultrasonic imaging equipment or the superficial ultrasonic imaging equipment. The lateral and axial resolution of the sound field can be detected to 0.5mm at most, and cystic lesions with the diameter of 2mm can be detected, and blind areas, geometric imaging position accuracy, detection depth and the like can be detected.
Fig. 5 is a schematic diagram of an embodiment of a high-frequency ultrasonic imaging device performance detection tissue phantom for performance detection by using a B-mode ultrasonic probe, wherein the B-mode ultrasonic probe 16 generally comprises a B-mode ultrasonic probe 17 and a host machine which are connected through a B-mode ultrasonic cable 18. When the phantom is used for performance detection, a proper amount of distilled water (to ensure that the coupling between the probe and the acoustic window is proper and the water tank is not suitable to be filled with the probe) or an aqueous gel type medical ultrasonic coupling agent is poured into the water tank firstly; starting the B-ultrasonic instrument to be tested according to a specified program; the probe of the instrument to be measured is placed on the acoustic window of the phantom through the coupling medium, and the scanning plane of the acoustic beam is perpendicular to the target line. The model, scanning mode and working frequency of the probe are recorded, and the curvature radius of the convex array probe is also recorded.
The B-ultrasonic instrument performance detection items comprise: (maximum) detection depth measurement, blind zone measurement, (threshold) lateral resolution measurement, (threshold) axial resolution measurement, longitudinal geometric position indication error (precision) measurement, transverse geometric position indication error (precision) measurement, observation of a simulated lesion, and the like; the procedure was as follows.
1. The method for measuring the maximum detection depth of the high-frequency ultrasonic imaging equipment specifically comprises the following steps:
(1) the probe is aligned to the longitudinal target group, and the top center of the mechanical sector scanning (including a ring array), a convex array and a phased array probe is aligned to the target group.
(2) The total gain is increased, STC is adjusted, far field gain is increased, and near field gain is adjusted to be proper.
(3) The contrast ratio (for tunable, the same applies below) is increased to an appropriate level.
(4) Brightness is increased (for dimmable, the same applies below), but limited to no defocus and halo on the full screen.
(5) The focusing adjustment (for the adjustable one, the same below) is set to a far-field focusing or multi-stage, full-depth simultaneous focusing state.
(6) By the adjustment, a uniform picture within the maximum depth range which can be reached by the detected instrument is obtained.
(7) And (5) micro-moving the probe, and reading the depth (mm) of the observed maximum depth target line, namely the (maximum) detection depth.
2. The blind area measurement is used for measuring the imaging capability of B ultrasonic on a short-distance object, and specifically comprises the following steps:
(1) the probe is aligned to the blind area target group, and if the blind area target group cannot be completely covered at one time, the probe is translated to observe the blind area target group in a segmented mode.
(2) And the total gain, the near-field gain and the brightness are properly reduced, and the back scattering points of the TM material are weakened, so that the target line image is clearly visible.
(3) The focus adjustment sets a near-field focus state.
(4) Reading the depth (mm) of the minimum depth target line which can be observed, and obtaining the blind area.
3. (threshold) lateral resolution measurement, comprising in particular:
(1) the probe is aimed at a lateral resolution target group or a lateral branch of an axial resolution target group.
(2) The overall gain is reduced, decreasing the TGC (or STC, DGC) depending on the depth of the target population.
(3) The brightness is reduced.
(4) The contrast ratio is kept high.
(5) The focusing adjustment is arranged at or close to the depth of the detected target group or in a multi-section full-depth simultaneous focusing state.
(6) Through the adjustment, the back scattering light spots of the TM material near the measured depth are hidden, and the target line image is kept to be clearly visible.
(7) The probe is translated in a small range and can be slightly tilted to read the minimum target line gap (mm) that can be resolved (i.e. the brightness between target line images is the same as the background), i.e. (threshold) lateral resolution at that depth.
4. (threshold) axial resolution measurement, comprising in particular:
(1) the probe is aimed at an axial resolution target cluster or an axial branch of an axial lateral resolution target cluster.
(2) The detected instrument is adjusted to measure the lateral resolution at the same time (threshold), and the axial resolution at the same depth is detected immediately after the lateral resolution at a certain depth is detected.
(3) The minimum target line gap (mm) that can be resolved is read, which is the axial resolution at that depth. It should be noted that due to the presence of the blocking effect, the gain and brightness may need to be improved appropriately so that the 1mm gap in the KS107BD phantom can be seen.
5. The method for measuring the indicating error (precision) of the longitudinal geometric position specifically comprises the following steps:
(1) the probe is aimed at the longitudinal target group.
(2) The total gain, TGC (or STC, DGC), contrast, brightness were all adjusted to medium.
(3) The focus adjustment is set to a multi-stage or full depth focus state.
(4) With the above adjustments, a sharp longitudinal target group image is obtained on a background of weak TM material backscattered light spots.
(5) Freezing the image, sequentially measuring the central distance (mm) of two target line images with the distance of 20mm in an effective detection depth range by using an electronic vernier, and calculating a relative error (%) by using the image with the maximum deviation of 20mm, namely the longitudinal geometric position indication error (precision).
6. The measurement of the indicating error (precision) of the transverse geometric position specifically comprises the following steps:
(1) the probe is aimed at the lateral target cluster.
(2) The total gain, TGC (or STC, DGC), contrast, brightness were adjusted to medium.
(3) The focusing adjustment is placed at or near the depth of the lateral target group or in a multi-stage, full-depth focusing state.
(4) Freezing the image, sequentially measuring the central distance (mm) of the two target line images at a distance of 20mm by using an electronic vernier, and calculating a relative error (%) which is the indicating error (precision) of the transverse geometric position according to the maximum deviation of the image and the image with the central distance (mm) of 20 mm.
7. Observing the simulated focus, and detecting the distinguishing and imaging ability of the B-ultrasonic to the block area and the size, thereby representing the finding and identifying ability of the focus, and specifically comprising the following steps:
(1) the probe is aimed at the simulated lesion of interest.
(2) Adjusting gain, TGC (or STC, DGC), contrast and brightness to the best state.
(3) The focus adjustment is placed at or near the depth focus or multi-stage, full depth focus state of the lesion.
(4) By the adjustment, obtaining a back scattering image of TM material similar to clinical diagnosis, and observing a simulated focus image on the background, which is characterized in that:
cyst: the inside is a black hole without light spots, and the black hole is clinically called as an 'echo-free zone'; the posterior backscattered spot is brighter than the two-sided image at the same depth, clinically referred to as "posterior enhancement". The longitudinal or transverse diameter (mm) can be measured with an electronic vernier if necessary and compared with the design value to find the relative error (%).
After the measurement is finished, pouring out and wiping out distilled water; if the couplant is gel type couplant, the couplant is cleaned by clean water after being wiped, and the couplant does not dry and knot on the surface of the acoustic window 11 or at the edge of the water tank; placing the sponge and covering the cover plate.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The performance detection device of the high-frequency ultrasonic imaging equipment is characterized by comprising a phantom shell, an acoustic window, a plurality of target lines (4), a plurality of simulated lesions (5) and a background tissue-imitating material; the phantom shell is of a cuboid structure and is formed by fixedly connecting a front panel (2), a rear panel (3), two side panels, a bottom panel and a water tank frame, the phantom shell and a sound window stuck in the water tank frame form a closed space together, and background tissue imitating materials are filled in the phantom shell; the bottom panel is provided with a plurality of inlets filled with background tissue-imitating materials, the target lines (4) and the simulated focuses (5) are embedded in the background tissue-imitating materials, and each target line vertically penetrates through the front panel (2) to the rear panel (3).
2. The performance testing apparatus for high-frequency ultrasonic imaging equipment according to claim 1, characterized in that said apparatus further comprises: the phantom shell is fixedly connected with the base (10) through a bottom panel.
3. The performance detection device of the high-frequency ultrasonic imaging equipment according to claim 1, characterized in that the material of the phantom housing and the base (10) is rigid structural plastic.
4. The performance testing apparatus of claim 1, wherein the acoustic window is a 50 μm-100 μm thick polyester film.
5. The performance detection device of the high-frequency ultrasonic imaging equipment according to claim 1, characterized in that the inlet on the bottom panel is a round hole (7) arranged at the edge thereof and is blocked by a blocking rubber, and the blocking rubber is a vacuum rubber.
6. The performance detection device of a high-frequency ultrasonic imaging device according to claim 1, wherein the background tissue-imitating material is a water-based polymer gel-based composite material, and is maintained by a maintenance liquid, and the maintenance liquid is injected through a plugging rubber.
7. The performance detection device of the high-frequency ultrasonic imaging equipment according to claim 1, characterized in that a plurality of target line openings are opened at the corresponding positions of the front panel (2) and the rear panel (3) in the horizontal direction for positioning the target lines (4); two ends of the target line (4) are respectively fixed on the outer side surfaces of the front panel (2) and the rear panel (3), and each target line has the same pulling force so that the nylon target lines are uniformly tightened; the target line material is a nylon line with the diameter of 0.1mm-0.5 mm.
8. The high frequency ultrasonic imaging apparatus performance detection device according to claim 7, wherein said plurality of target lines (4) comprises: a longitudinal target population (440), a transverse target population, a blind spot target population (401), an axial resolution target population, a lateral resolution target population, and a fine lateral resolution target population;
the longitudinal target group (440) comprises a group of target lines which are arranged at equal intervals along a longitudinal central line, and the longitudinal distance between every two adjacent target lines is 10 mm;
the transverse target groups comprise a plurality of groups of target groups arranged on horizontal planes at different depths from the acoustic window, each group of target groups comprises a plurality of target lines which are transversely arranged at equal intervals, and the transverse distance between every two adjacent target lines is 10 mm;
the blind zone target group (401) comprises 7 target lines which are staggered alternately in the horizontal direction, and the distances between each target line and the acoustic window are respectively 2mm, 3mm, 4mm, 5mm, 6mm, 7mm and 8 mm;
the axial resolution target group comprises a first axial resolution target group (421), a second axial resolution target group (422), a third axial resolution target group (423) and a fourth axial resolution target group (424), a target line closest to the acoustic window in each target group is a central target line, the four central target lines are respectively positioned at the positions with the depths of 10mm, 30mm, 5mm and 70mm away from the acoustic window, the vertical distances of two adjacent target lines are 3mm, 2mm, 1mm and 0.5mm from the central target line, and the horizontal distance is 1 mm;
the lateral resolution target groups comprise a first lateral resolution target group (411), a second lateral resolution target group (412), a third lateral resolution target group (413) and a fourth lateral resolution target group (414), and the target groups are respectively positioned on horizontal planes with the depths of 10mm, 30mm, 50mm and 70mm from the acoustic window; the horizontal distance between two adjacent target lines is 4mm, 3mm, 2mm and 1mm in sequence;
the fine lateral resolution target groups comprise a first fine lateral resolution target group (431), a second fine lateral resolution target group (432), a third fine lateral resolution target group (433) and a fourth fine lateral resolution target group (434), and the four groups of target groups are respectively positioned on horizontal planes at depths of 10mm, 30mm, 5mm and 70mm from the acoustic window; each group of target groups consists of two target lines, and the linear distance between the two target lines is 0.5 mm.
9. The performance detection device of the high-frequency ultrasonic imaging equipment according to claim 1, characterized in that the simulated focus (5) is a cylindrical structure, the cylindrical axis of the simulated focus is parallel to the target line (4), and two ends of the simulated focus (5) are respectively connected with the inner side surfaces of the front panel (2) and the rear panel (3); the simulated lesion (5) comprises a first cystic simulated lesion (501), a second cystic simulated lesion (502) and a third cystic simulated lesion (503) which are alternately staggered in the horizontal direction, and the diameters of the three simulated lesions are increased and the distances between the three simulated lesions and an acoustic window are increased.
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| CN112129405A (en) * | 2020-10-22 | 2020-12-25 | 南京广慈医疗科技有限公司 | Portable precision detection device of HIFU diagnosis and treatment system |
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