CN212879336U - Axial performance testing mold body for CT spiral scanning multi-plane reconstruction image - Google Patents
Axial performance testing mold body for CT spiral scanning multi-plane reconstruction image Download PDFInfo
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Abstract
The utility model relates to a CT spiral scanning multiplanar reconstruction image axial performance testing die body, the body of which is an organic glass cube or a cuboid, the three axial directions of X, Y, Z in the body are respectively provided with a tungsten bead string and a tungsten wire for measuring the spatial resolution of the CT spiral scanning reconstruction image, six surfaces of the body are respectively provided with 1 to 5 metal wires for measuring the layer thickness deviation of the CT spiral scanning reconstruction image, the metal wires are obliquely arranged on the surfaces where the metal wires are arranged, equidistantly, parallelly and centrosymmetrically, the highest end of the metal wire positioned below and the lowest end of the adjacent metal wire positioned above are positioned on the same horizontal line, the included angle between the metal wire and the related surface is 18.4 to 45 degrees, the utility model has reasonable design, simple structure, firmness and reliability, convenient use and easy maintenance, and can meet the axial performance testing requirement of the CT spiral scanning multiplanar reconstruction image, the method can also be used for measuring the performance of CT axis scanning reconstructed images.
Description
Technical Field
The utility model relates to a medical CT scanning rebuilds image capability test technical field indicates the axial capability test of CT helical scan rebuild image especially, specifically says so a CT helical scan multiplanar rebuilds image axial capability test die body.
Background
At present, the medical CT scanning system of the medical institution equipment in China has completed the updating from single-row axial scanning CT to multi-row spiral scanning CT.
When CT scanning is performed in clinical diagnosis, spiral scanning is adopted for cardio-cerebrovascular radiography and chest and abdomen disease examination (namely, when X-rays are rotated and irradiated, an examinee lying on an examination table moves along with the bed, commonly called spiral scanning), and the CT scanning has the advantages of high scanning and imaging speed and has the defect that the image quality is not as good as that of the image quality of the commonly called axial scanning in which the examination table does not move during scanning.
During CT scanning, in order to accurately determine the focus morphology and avoid misdiagnosis and missed diagnosis, medical staff often needs to perform multi-axial plane reconstruction by adopting a spiral scanning technology after scanning and reconstructing a Z-axis tomography XY plane image (a cross-section image), so as to obtain a sagittal plane image (a Z-Y plane perpendicular to the ground and formed along the front and rear paths of the horizontal lying human body, namely the Z axis, is a sagittal plane) and a coronal plane image (an XZ plane parallel to the ground and formed along the left and right paths of the human body, namely the X axis, is a coronal plane) or three-dimensional reconstruction at any angle.
The performance quality management standard of the spiral scanning three-dimensional reconstruction image is not seen so far, and CT manufacturers refer to isotropy by themselves, but do not see detailed technical indexes and documentations thereof. In clinical radiodiagnosis of hospitals, the CT system axis scans the existing detection phantom to reconstruct the performance parameters of XY plane images and estimate the form and resolution of the focus three-dimensional image, which has the technical rigor defect, and is especially suitable for a wide-beam multi-row spiral CT scanning system.
SUMMERY OF THE UTILITY MODEL
To the defect that exists among the prior art, the utility model aims to provide a CT spiral scanning multiplanar rebuilds image axial capability test die body, this die body reasonable in design, simple structure, firm reliable, convenient to use, easy to maintain, this die body can be used to CT spiral scanning multiplanar rebuild image axial capability test, provides actual measurement data for rebuilding focus three-dimensional image performance aassessment, also can be used to CT axle scanning to rebuild the measurement of image performance.
In order to achieve the above purpose, the utility model adopts the technical proposal that:
the utility model provides a CT spiral scanning multiplanar reconstruction image axial capability test die body which characterized in that includes:
the body is an organic glass cube or cuboid with an upper surface, a lower surface, a left surface, a right surface, a front surface and a back surface,
the material of the body can also be other organic light solid materials, such as polycarbonate PC, polystyrene PS, nylon or bakelite,
the tungsten filament used for measuring the space resolution of CT spiral scanning multi-plane reconstructed images, namely the high-contrast resolution, is arranged in the body along the Z-axis direction, the diameter of the tungsten filament is 0.05-0.15 mm, a string of tungsten beads used for measuring the space resolution of the CT spiral scanning multi-plane reconstructed images, namely the high-contrast resolution, is arranged along the X, Y-axis direction, the tungsten bead string comprises a plurality of tungsten beads, the diameter of the tungsten beads is 0.2-0.3mm, the bead spacing is 5mm, and the three tungsten filaments and the tungsten bead string are not overlapped and crossed on the same plane.
The advantages of this design are: the data used by the spiral scanning three-dimensional reconstruction image is obtained from continuous scanning collection when an examination bed (Z-axis direction) moves, the dot image performances of tungsten filament segments and tungsten beads on an XY plane which is transverse to the Z axis are hardly different, and the difference of the MTF value of the space resolution measured and calculated by two dot images on the same plane is less than 0.5Lp/cm (within the range of actually measured 5-16 Lp/cm), and the two values are equal or different. While in the reconstruction of the XZ plane intersecting the X-axis YZ and the Y-axis XZ plane, the hardening artifact of the tungsten filament in a single direction is obvious, and the isotropy of the tungsten bead in the three-dimensional scanning is not influenced by the hardening artifact. The MTF value measured by the bead point image in the same XZ or YZ plane can be higher than 1.0Lp/cm than that measured by the tungsten filament section point image. Therefore, the tungsten filament is arranged in the Z-axis direction, and the tungsten bead strings (with the bead spacing of 5mm) are arranged in the X-axis direction and the Y-axis direction. The space resolution MTF value of each image with various scanning layer thicknesses can be continuously measured in the Z-axis direction and the tungsten filament length range, but the space resolution of the beaded image can only be measured if the space resolution MTF value cannot be measured in the X-axis or Y-axis direction.
Six of the body all are equipped with 1 ~ 5 tungsten filaments that are used for measuring diameter of CT helical scan multiplanar reconstruction image layer thickness deviation and are 0.1 ~ 0.3mm on the surface, the tungsten filament all sets up in the surface low left side height on the right side or high left side low right side slant, equidistance, parallel arrangement, and the highest end of the tungsten filament that is located the below and rather than the lower extreme of the tungsten filament that is located the top adjacent is on same water flat line, is used for measuring the oblique line of the scanning layer thickness deviation of crossing Z axle, below and the preceding or the contained angle at the back of body be alpha1The included angle between the oblique lines on the front and back surfaces for measuring the thickness deviation of the scanning layer crossing the X axis and the left or right surface of the body is alpha2For measuring the thickness deviation of the scanning layer transverse to the Y axisThe included angle between the oblique lines on the left and the right of the difference and the upper surface or the lower surface of the body is alpha3Said angle α1、α2、α3The angle of the angle is 18.4-45 degrees,
the tungsten wire on the surface of the body can also adopt a copper wire or a steel wire or a tin wire;
furthermore, the tungsten filaments on the six surfaces of the organic glass body are arranged in the grooves on the surface of the body, three tungsten filaments are respectively arranged on the upper surface and the lower surface of the organic glass body, two tungsten filaments are respectively arranged on the left surface, the right surface, the front surface and the rear surface of the organic glass body, the diameter of the tungsten filament is selected to be 0.1mm, all the tungsten filaments are symmetrically arranged with the center of the surface, and the included angle alpha is1、α2、α3Are all at 26.6 degrees;
further, the air conditioner is provided with a fan,
the body is provided with a first through hole along the X axial direction,
the body is provided with a second through hole along the Y-axis direction,
the body is provided with a third through hole along the Z-axis direction,
the tungsten filament and the tungsten bead string for measuring the image space resolution are respectively arranged on the central axis line position in the cylindrical supporting and protecting rod matched with the through hole;
furthermore, the body is a cuboid, the long edge of the body is along the Z-axis direction, and four edges of the body along the Z-axis direction are provided with plane or arc surface chamfers;
the utility model provides a test die body has reasonable in design, simple structure, firm reliable, convenient to use, advantages such as easy to maintain, and its efficiency of software testing is high, can satisfy CT helical scan many planes and rebuild the requirement of image axial capability test, also can be used to CT axle scanning and rebuild the measurement of image performance.
The testing mold body of the utility model has high testing efficiency, and all the commercially available spiral CT scanning systems can reconstruct XY, XZ and YZ three plane images by using the data of the one-time spiral scanning testing mold body; the thickness deviation (mm) and the spatial resolution MTF (Lp/mm) of the reconstructed image can be measured by using related software programmed by the existing image processing technology.
The software calculates and calculates the layer thickness deviation (mm) of the reconstructed image, namely, the length of the half-width of the corresponding metal wire image on the XY, XZ and YZ plane images obtained by analyzing and calculating the reconstruction of the tomography test mold body, namely, the accurate value of the scanning reconstructed layer thickness is calculated.
The software measures and calculates the image spatial resolution MTF (Lp/mm), namely the software analyzes and calculates a point image of a tungsten filament (for example, the diameter of 0.05mm and the total length of 50-200 mm) or a tungsten bead arranged in the three axial directions obtained by a tomography test phantom reconstruction plane, analyzes a two-dimensional line diffusion function of the point diffusion function in the prior art, calculates and gives a modulation transfer function curve (MTF), and marks the contrast on the curve, the corresponding spatial resolution value and the line pair/centimeter (Lp/cm).
As in the utility model, the known water model is connected in front of or behind the test model, and the following performance of the spiral scanning water model reconstruction multi-plane image can be measured and calculated by using the prior image processing technology to compile the relevant software: CT values of water, image noise, uniformity, and Low Contrast Detectability (LCD).
Drawings
The utility model discloses there is following figure:
FIG. 1 is a schematic diagram of a test phantom,
figure 2 is a schematic view of the top of a test mold body,
FIG. 3 is a schematic view of the underside of a test phantom,
FIG. 4 is a schematic left and right side view of the test mold body,
figure 5 is a schematic front view of a test mold body,
FIG. 6 is a schematic rear view of a test phantom,
FIGS. 7 to 11 are schematic diagrams showing the specific number of wires.
FIG. 12 is a schematic view of the layout of three tungsten filaments and tungsten bead strings
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1-12, fig. 1 is a schematic perspective view of the present invention, which is directly opposite to the back 6 of the mold body, and fig. 2-6 are schematic diagrams of the six-sided development of the present invention, which are developed based on the front 5 of the mold body.
The utility model relates to a be used for CT helical scan multiplanar to rebuild image axial capability test die body, include:
the body 20 is a cube or a rectangular column (see fig. 1) having three pairs of surfaces, i.e., an upper surface 1, a lower surface 2, a left surface 3, a right surface 4, a front surface 5, and a rear surface 6, the body 20 is made of an organic light solid material, preferably an organic material having a density close to that of water, such as polycarbonate PC, high density polyethylene, polystyrene PS, organic glass (PMMA, also called acrylic), nylon, or bakelite, and the embodiment is made of organic glass.
The tungsten filament and the tungsten bead string for measuring the space resolution, namely the high contrast resolution of the CT spiral scanning multi-plane reconstruction image are arranged in the body along the direction of the X, Y, Z axis, and the following embodiments can be adopted (see fig. 12): the tungsten filament 10 is arranged along the Z-axis direction, a string of tungsten beads is respectively arranged along the X, Y-axis direction, the X-axis is a first tungsten bead string 13, the Y-axis is a second tungsten bead string 14, the bead spacing is 5mm, the three tungsten filaments and the tungsten bead strings (the tungsten filament 10, the first tungsten bead string 13 and the second tungsten bead string 14, the total three tungsten filaments and the tungsten bead strings are not overlapped and crossed on the same plane, the diameter of the tungsten filament is 0.05-0.15 mm, and the diameter of the tungsten bead is 0.2-0.3 mm. The three tungsten filaments and the two tungsten bead strings are not overlapped and contacted with each other, namely, no crossed contact point exists between the tungsten filament 10 and the two tungsten bead strings 13 and 14 in space; when the scheme of arranging the supporting rods (supporting and protecting rods) is adopted, the non-overlapping means that the supporting rods of the three tungsten filament and tungsten bead strings do not have intersected cross contact points in space, and the aim is to avoid the overlapping of scanned images; fig. 12 shows an example of the layout of tungsten filament and tungsten bead string, and a supporting and protecting rod for fixing the tungsten filament and tungsten bead string is inserted into the holes 7, 8 and 9 in fig. 1. The diameter of the tungsten wire is 0.05-0.15 mm, wherein the diameters of 0.05mm, 0.07mm, 0.1mm, 0.12mm and 0.15mm can be selected.
The tungsten filament 10 and the tungsten bead strings 13 and 14 in the body 20 are respectively perpendicular to three pairs of surfaces of the mold body, as shown in fig. 12, the tungsten filament 10 in the Z-axis direction is perpendicular to the front (the supine head position of the patient, namely the CT frame position) and the rear (the foot position of the patient), the tungsten bead string 14 in the Y-axis direction is perpendicular to the upper surface and the lower surface, and the tungsten bead string 13 in the X-axis direction is perpendicular to the left surface and the right surface. The arrangement of the space positions of the tungsten filament and the tungsten bead string considers the uniformity of the reconstructed image and avoids the interference of hardening artifacts of X-ray scanning.
The six surfaces of the body 20 are provided with 1-5 metal wires 30 for measuring the layer thickness deviation of the CT spiral scanning reconstructed image, and the metal wires can be tungsten wires, copper wires, steel wires or tin wires. The number of the metal wires on each surface can be the same, for example, 2, 3, 4 or 5, the number of the metal wires on each surface can also be different, the material of the metal wires can be the same or different, and the metal wires can be selected according to the design of the ratio between the die body length and the image length of the metal wires and the thickness of the scanning layer, and particularly, refer to fig. 7 to 11. In the embodiment shown in fig. 2 to 6 (schematic diagrams of the development of six surfaces of the mold body), two metal wires are arranged on the front, rear, left and right four surfaces, and three metal wires are arranged on the upper and lower surfaces respectively; tungsten wire is used as the metal wire in this embodiment.
The wires 30 are all arranged obliquely on the surface, parallel to each other and equidistant.
The utility model discloses an embodiment is: on the plan views of the upper part 1 and the lower part 2, 3 metal wires are arranged for collecting the thickness information (spiral scanning and axial scanning) of the scanning reconstructed image layer of the cross section (XY plane), the metal wire 30 is obliquely arranged to be lower left and higher right, higher left and lower right, the highest end 31 of the metal wire positioned below and the lowest end 32 of the metal wire positioned above and adjacent to the metal wire are positioned on the same horizontal line, and the purpose of the arrangement is that: within the length of the phantom, continuous layer thickness information is acquired on each layer of image that is reconstructed by the wide-range helical scan (or axial scan), i.e., the projections of the wire 30 are not interrupted or overlapped during the multi-layer continuous scan reconstruction.
Two metal wires are arranged on the left plane view 3 and the right plane view 4 and are used for acquiring the thickness information of the coronal plane (XZ plane) scanning and reconstructing image layers.
Two metal wires are arranged on the front 5 and back 6 plane views and are used for acquiring the thickness information of the scanning and reconstruction image layer of the sagittal plane (YZ plane).
The metal wires 30 arranged on the six surfaces of the body 20 are preferably tungsten wires, the tungsten wires can be adhered to the surface of the die body, and can also be arranged below the surface layer of the die body by adopting other methods, in the embodiment of the utility model shown in figures 1-6, the metal wires (tungsten wires) 30 are arranged in the grooves 301 on the surface of the body 20, the upper surface 1 and the lower surface 2 are respectively provided with three tungsten wires, and the left surface 3, the right surface 4, the front surface 5 and the rear surface 6 are respectively provided with two tungsten wires. Because the partial volume effect of CT scanning imaging is also called volume effect, the image contrast of the metal wire with the same material and the same wire diameter in the image reconstructed by scanning different layer thicknesses in the same background material can be greatly different, the diameter of the tungsten wire is 0.1-0.3 mm, which is an experimental optimized value through various materials and wire diameters, wherein the diameters of 0.1mm, 0.2mm and 0.3mm can be selected.
The parallel wires (tungsten wires) may be offset on the die body surface (i.e. located near one side), but the preferred arrangement is: all tungsten filaments are symmetrically arranged with the center of the surface, so that the tungsten filaments are uniformly distributed, and the test positioning and data processing programming are convenient, and the method is shown in figures 1-6.
The oblique lines on the upper surface 1 and the lower surface 2 for measuring the thickness deviation of the scanning layer of the cross section (intersecting the Z axis) form an included angle alpha with the front surface 5 or the rear surface 6 of the body 201The included angle between the oblique lines on the front 5 and the back 6 for measuring the scanning layer thickness deviation of the sagittal plane (transverse X axis) and the left 3 or the right 4 of the body 20 is alpha2The inclined lines on the left surface 3 and the right surface 4 for measuring the scanning layer thickness deviation of the coronal plane (intersecting the Y axis) form an included angle alpha with the upper surface 1 or the lower surface 2 of the body 203Said angle α1、α2、α3The angle of (A) is 18.4-45 DEG, and the included angle alpha1、α2、α3May be different from each other or the same. When the included angle is 45 degrees, the length of the metal wire scanning reconstruction image is equal to the thickness of the scanning reconstruction layer. When the included angle is 18.4 degrees, the length of the metal wire scanning reconstruction image is three times of the thickness of the scanning reconstruction layer (the projection relation is 1/tan alpha), the measurement accuracy of a thinner layer can be improved, and the difficulty of die body placement alignment is also increased. Said angle alpha1、α2、α3Most preferably 26.6 degreesThe length of the half width of the metal wire scanning reconstruction image is twice of the thickness of the scanning reconstruction layer. This can form a range of products.
The tungsten filament and the tungsten bead string of the utility model can be directly arranged in the die body, for example, the die body is manufactured into a whole when being formed. For the convenience of the processing preparation of die body, the test of the die body of also being convenient for is used, the utility model discloses body 20 said respectively opens along X, Y, Z three axial has a through- hole 7, 8, 9, and tungsten filament, the tungsten pearl cluster of saying set up in a cylindrical support fender rod axle position (not shown in the figure) the same with the die body material, support the size of fender rod and the size looks adaptation of through-hole, and like this, the preparation precision is guaranteed, the equipment is all convenient with the use.
The body 20 can be a cube or a cuboid (including 6 faces which are all rectangles, or front and back 2 faces which are squares, and upper, lower, left and right 4 faces which are rectangles), and specifically, independent mold bodies or multifunctional test mold bodies combined with other CT imaging performance test modules can be designed according to different needs by selecting different shapes, sizes and dimensions.
As an alternative embodiment, the die body side length may be 7 to 24cm, for example, cubic die bodies such as 7 × 7, 9 × 9, 11 × 11, 12 × 12, 15 × 15, 17 × 17, 20 × 20, 22 × 22, or 24 × 24cm are all optional embodiments; for a cuboid die body, the Z axial length of the cuboid die body can be 1.1, 1.3, 1.5, 1.7 or 2.0 times of the side length of the front side and the rear side correspondingly, and the cuboid test die body can be used in a head die or an abdomen die; test phantom bodies of 20, 22 or 24cm cubed sides may be used independently.
Specific placement of the wires 30 referring to fig. 7-11, the dashed lines are only used to indicate that "the highest end 31 of the lower wire 30 and the lowest end 32 of the adjacent upper wire 30 are in the same horizontal line".
FIG. 7 shows a wire comprising 1 wire 30, at an included angle α1、2、3Is 45 DEG, can be used for scanning test with the layer thickness of 10 mm;
fig. 8 shows a device comprising 2 wires 30, with an angle alpha1、2、326.56 ° (approximately 26.6 °);
fig. 9 shows a device comprising 3 wires 30, with an included angle alpha1、2、318.4 deg., which can be used for scanning tests with a layer thickness of 5 mm.
The utility model discloses body 20 of saying can be the cube, also can be the cuboid, and the long limit of cuboid is along Z axle direction.
In order to use with other test mold body cooperations, the utility model discloses four limits of body 20 along Z axle direction can be equipped with plane chamfer or arc surface chamfer.
The test die body, its test application method and data processing method all can refer to prior art and go on, no longer detailed description.
Those not described in detail in this specification are within the skill of the art.
Attached:
brief application instruction of axial performance test die body of CT spiral scanning multi-plane reconstruction image
The test die body can be designed into an independent die body according to different requirements by selecting different shapes, sizes and dimensions or can be combined with other CT imaging performance test modules into a multifunctional test die body.
When the axial performance index test of CT spiral scanning reconstructed images is implemented, the die body is arranged at the end, close to the frame, of the scanning examination bed, the Z axis of the die body is parallel to the scanning central axis, the height of the bed is adjusted, and the central position of the die body is adjusted to the central axis of the system scanning under the indication of positioning light. Scanning the front and side positioning images one by one. On the system image display interface, the checking and correcting die bodies are placed correctly in place, namely the upper surface and the lower surface are horizontal, the left surface and the right surface are vertical, and the front surface and the rear surface are vertical.
Making a spiral scanning acquisition plan: setting standard kV and mA, scanning time of each circle, scanning range (length), thread pitch, layer thickness (the best thin layer thickness is selected during spiral acquisition), a reconstruction algorithm and the like. Designing a reconstruction layer thickness, automatically reconstructing Z, Y, X triaxial plane images by the system after clicking an axial reconstruction program of the system, sending the reconstructed images to an image workstation, and copying DICOM image data by using an optical drive.
The layer thickness deviation (mm) and the spatial resolution MTF (Lp/mm) of the reconstructed image can be measured and calculated by using related software programmed by the existing image processing technology. Layer thickness dimensional deviations can also be measured with the naked eye using the DICOM tour software "RadiAnt DICOM Viewer (64-bit) Medixant".
Claims (5)
1. The utility model provides a CT spiral scanning multiplanar reconstruction image axial capability test die body which characterized in that includes:
the body (20) is an organic glass cube or cuboid with an upper surface (1), a lower surface (2), a left surface (3), a right surface (4), a front surface (5) and a rear surface (6),
the main body (20) is internally provided with a tungsten filament (10) which is used for measuring the spatial resolution, namely the high contrast resolution, of the CT spiral scanning reconstructed image and has the diameter of 0.05-0.15 mm along three axial directions of X, Y, Z, the three tungsten filaments are not overlapped and crossed on the same plane,
six of body (20) all are equipped with 1 ~ 5 tungsten filament (30) that the diameter that is used for measuring CT helical scan rebuild image layer thickness deviation is 0.1 ~ 0.3mm on the surface, tungsten filament (30) all are in the surperficial low left and right height or high left and right low slant setting of place, equidistance, parallel arrangement, and the highest end (31) of the tungsten filament that is located the below and rather than adjacent the least significant end (32) that are located the tungsten filament of top are in same water flat line for measure the contained angle alpha that intersects preceding (5) or back (6) of the scanning layer thickness deviation of Z axle on (1), below (2) the slash and body (20)1The included angle between the oblique lines on the front surface (5) and the back surface (6) for measuring the scanning layer thickness deviation crossing the X axis and the left surface (3) or the right surface (4) of the body (20) is alpha2The included angle between the oblique lines on the left surface (3) and the right surface (4) and the upper surface (1) or the lower surface (2) of the body (20) is alpha for measuring the thickness deviation of the scanning layer intersecting the Y axis3The angle alpha1、α2、α3The angle of the angle is 18.4-45 degrees.
2. The axial performance test phantom of the CT helical scan multi-plane reconstruction image of claim 1, wherein: the tungsten filaments (30) on the six surfaces of the body (20) are arranged in the grooves (301) on the surface of the body (20), the upper surface (1) and the lower surface (2) are respectively provided with three tungsten filaments, and the left surface (3) and the right surface (C)4) The front surface (5) and the rear surface (6) are respectively provided with two tungsten wires, the diameter of each tungsten wire is 0.1mm, all the tungsten wires are symmetrically arranged with the center of the surface, and the included angle alpha is1、α2、α3All at 26.6 degrees.
3. The axial performance test phantom of the CT helical scanning multi-plane reconstruction image of claim 1 or 2, wherein:
the body (20) is provided with a first through hole (7) along the X axial direction,
the body (20) is provided with a second through hole (8) along the Y-axis direction,
the body (20) is provided with a third through hole (9) along the Z-axis direction,
the tungsten filament (10) for measuring the spatial resolution of the CT helical scanning reconstructed image is arranged at the center of the supporting and protecting rod matched with the through hole.
4. The axial performance test phantom of the CT helical scanning multi-plane reconstruction image of claim 1 or 2, wherein: the body (20) is a cuboid, the long edge of the cuboid is in the Z-axis direction, and four edges of the body (20) in the Z-axis direction are provided with plane or arc surface chamfers.
5. The axial performance test phantom of CT helical scanning multi-planar reconstruction images as claimed in claim 3, wherein: the body (20) is a cuboid, the long edge of the cuboid is in the Z-axis direction, and four edges of the body (20) in the Z-axis direction are provided with plane or arc surface chamfers.
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| CN202020145398 | 2020-01-22 | ||
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