CN107753052B - X-ray imaging dynamic contrast detection plate - Google Patents
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Abstract
The invention discloses an X-ray imaging dynamic contrast detection plate, which comprises a step die body and an arc die body; the step die body is of a solid step structure; the step die body comprises a plurality of steps, and the same end of each step is provided with a raised positioning key; the arc-shaped die body is of a solid right-angle trapezoidal structure with an inclined plane being an arc surface; the lower bottom surface of the arc-shaped die body is provided with a sunken positioning key groove matched with the positioning key; the arc-shaped die body is detachably arranged on any step of the step die body through the positioning key groove and the positioning key. Therefore, the detection plate provided by the invention realizes the free combination of the arc-shaped die body and the step die body in the image gray scale range, meets the imaging contrast requirements of different operation objects, and simultaneously realizes the sectional gradual contrast of the contrast in different contrast ranges by arranging the arc-shaped die body with the inclined surface being the arc surface, realizes the test and comparison of the dynamic contrast change resolution capability, and improves the imaging precision of the image.
Description
Technical Field
The invention relates to the field of X-ray imaging, in particular to an X-ray imaging dynamic contrast detection plate.
Background
In a Digital Radiography (CR) imaging system, the range of the gray scale distribution and the resolution of an image determine the resolution effect of the image. In order to visually check the gray distribution range and the resolution capability of an image, a specific imaging phantom (detection plate) is required.
At present, many relevant researches are carried out on organizations and companies of imaging mold bodies at home and abroad, and some existing imaging mold bodies are provided, such as UAB low-contrast experimental devices, IEC mold bodies, TORCDR mold bodies, CDRAD 2.0 low-contrast-detail mold bodies of Germany QUART company and the like, specifically, the UAB low-contrast experimental devices comprise 2 aluminum target discs with the thickness of 6.1mm, and each thick aluminum target disc is9 aluminum target plates
18 in contrast; the IEC die body has 19
The range of the contrast of the round holes is 0.5-20%, and the number of the contrasts is 19; there are 34 TORCDR motifs
34 contrast holes are arranged; CDRAD 2.0 low contrast-detail phantom from quaart, germany, had 15 wells with 15 contrasts. Although they all have their own advantages and disadvantages, the above-mentioned imaging phantoms generally have the following defects, for example, mainly focus on the comparison of low contrast, and generally only provide several, dozens of separate contrasts to test and compare, the contrast range is fixed and the range is smaller, namely the existing imaging phantoms are all fixed structures, can not carry on the effective combination in the image gray scale range, make the above-mentioned imaging phantoms in the course of using, because of fixed contrast number and contrast range, can only meet the imaging contrast requirement of some operation objects, have very big limitations.
Disclosure of Invention
The invention aims to provide an X-ray imaging dynamic contrast detection plate which can be effectively combined in an image gray scale range, meets the imaging contrast requirements of different operation objects, can realize the test and comparison of the dynamic contrast change resolution capability and improves the X-ray imaging precision.
In order to achieve the purpose, the invention provides the following scheme:
an X-ray imaging dynamic contrast detection plate comprises a step die body and an arc die body;
the step die body is of a solid step structure; the step die body comprises a plurality of steps, and a raised positioning key is arranged at the same end of each step;
the arc-shaped die body is of a solid right-angle trapezoidal structure with an inclined plane being an arc surface; a concave positioning key groove matched with the positioning key is formed in the lower bottom surface of the arc-shaped die body;
the arc-shaped die body is detachably arranged on any step of the step die body through the positioning key groove and the positioning key.
Optionally, the shortest vertical distance between the arc surface and the lower bottom surface of the arc-shaped die body is 1 mm; the longest vertical distance between the cambered surface and the lower bottom surface of the arc-shaped die body is 30 mm.
Optionally, the number of the steps of the step mold body is 10, and the height difference between the adjacent steps is 5 mm.
Optionally, the short sides of the steps are all 20 mm; the long sides of the steps are all 220 mm.
Optionally, the X-ray imaging dynamic contrast detection plate further comprises a contrast sheet; the contrast thin plate is horizontally fixed above any one step of the step die body and is parallel to the bottom surface of the step die body.
Optionally, the X-ray imaging dynamic contrast detection plate further comprises a support frame; the contrast sheet is horizontally fixed on any step of the step mold body through the support frame.
Optionally, the stepped die body, the arc-shaped die body and the contrast thin plate are made of aluminum alloy materials.
Optionally, the number of the contrast sheets is one or more.
Optionally, the thickness of the contrast sheet is 0.01mm, 0.008mm, 0.006mm or 0.002 mm; the length and width of the contrast sheet are both less than the length of the long side of the step, and the length of the contrast sheet is equal to the width of the contrast sheet.
Optionally, the length of the lower bottom surface of the arc-shaped mold body is 220 mm; the width of the lower bottom surface of the arc-shaped die body is 20 mm; the length of the upper bottom surface of the arc-shaped die body is 20 mm; the width of the upper bottom surface of the arc-shaped die body is 20 mm; the radius of the cambered surface of the arc-shaped die body is 680 mm; the height of the arc-shaped die body is 30 mm.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides an X-ray imaging dynamic contrast detection plate, which comprises a step die body and an arc die body; the step die body is of a solid step structure; the step die body comprises a plurality of steps, and a raised positioning key is arranged at the same end of each step; the arc-shaped die body is of a solid right-angle trapezoidal structure with an inclined plane being an arc surface; a concave positioning key groove matched with the positioning key is formed in the lower bottom surface of the arc-shaped die body; the arc-shaped die body is detachably arranged on any step of the step die body through the positioning key groove and the positioning key. Therefore, by adopting the detection plate provided by the invention, the free combination of the arc-shaped die body and the step die body in the image gray scale range is realized through the positioning key slot of the arc-shaped die body and the positioning key of the step die body, the imaging contrast requirements of different operation objects are met, meanwhile, the invention realizes the contrast subsection gradual change contrast in different contrast ranges by arranging the arc-shaped die body with the inclined surface as the arc surface, realizes the test and comparison of the dynamic contrast change resolution capability, and improves the imaging precision of the image.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a perspective view of an X-ray imaging dynamic contrast detection panel according to an embodiment of the present invention;
FIG. 2 is a top view of an X-ray imaging dynamic contrast detector plate in accordance with an embodiment of the present invention;
FIG. 3 is a front view of an arc die body and step die body combination according to an embodiment of the present invention;
FIG. 4 is a perspective view of a stepped phantom of an X-ray imaging dynamic contrast detection plate according to an embodiment of the present invention;
FIG. 5 is a front view of a stepped phantom of an X-ray imaging dynamic contrast detector plate in accordance with an embodiment of the present invention;
FIG. 6 is a top view of a stepped phantom of an X-ray imaging dynamic contrast detector plate in accordance with an embodiment of the present invention;
FIG. 7 is a front view of an arc-shaped phantom of an X-ray imaging dynamic contrast detection plate in accordance with an embodiment of the present invention;
FIG. 8 is a top view of an arcuate phantom of an X-ray imaging dynamic contrast detector plate in accordance with an embodiment of the present invention;
FIG. 9 is a schematic diagram of the principle of contrast ratio testing according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an X-ray imaging dynamic contrast detection plate which can be effectively combined in an image gray scale range, meets the imaging contrast requirements of different operation objects, can realize the test and comparison of the dynamic contrast change resolution capability and improves the X-ray imaging precision.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Before explaining the present invention in further detail, the following core principles of the present invention and matters related to the present invention will be explained first.
The core technical principle of the invention is that an arc-shaped die body with the characteristic that the inclined plane is an arc surface is superposed on a stepped die body to form different contrast ranges, the gradual change range of the contrast is enlarged, the low contrast can be generated by combination, and the extremely low contrast can be further formed by superposing thin plates with different thicknesses.
The working principle of CR is as follows: firstly, exposing by X-rays to enable an IP image plate to generate an image latent image; and secondly, the IP image plate is sent into a laser scanner for scanning, a latent image of the IP image plate in the scanner is converted into visible light after being excited, the visible light is converted into an electronic signal after being read, the electronic signal is transmitted to a computer to display a digital image, and a laser photo meeting the diagnosis requirement can be printed out or stored in a magnetic tape, a magnetic disk and an optical disk.
CR systems are relatively simple in construction and easy to install. The IP image board can be suitable for the existing X-ray machine, directly realizes the digitization of common radiation equipment, improves the working efficiency, reduces the irradiated dose of patients, is safer, and brings great social benefit and economic benefit for hospitals. The CR system has obviously better display on bone structure, articular cartilage and soft tissue than the traditional X-ray imaging; mediastinal structures such as blood vessels and trachea are easily visualized; the detection rate of the pulmonary nodular lesion is higher than that of the traditional X-ray imaging; the observation of the intestinal tube pneumatosis, pneumoperitoneum, calculus and other calcium-containing lesions is superior to the traditional X-ray image; for contrast radiography of the gastrointestinal tract, the CR system (digital gastrointestinal tract) is superior to conventional X-ray images in displaying small areas of the stomach, small lesions and folds of the intestinal mucosa.
A DR system: the X-ray photography system digital image acquisition control system is composed of a digital image acquisition board (a detection board, and the internal structure of the digital image acquisition board can be divided into a CCD (charge coupled device), amorphous silicon and amorphous selenium) and a special filter BUCKY digital image acquisition control X-ray photography system digital image workstation.
The working principle of the DR system is that in an amorphous silicon image plate, X-rays are converted into visible light through a fluorescent screen, then converted into electronic signals according to matrix pixels through a TFT thin film transistor circuit, and the electronic signals are transmitted to a computer, and an image is displayed through a monitor or transmitted into a PACS network. DR techniques can be classified into indirect conversion and direct conversion from the X-ray detector imaging principle. The first generation of indirect conversion employed an intensifying screen plus an optical lens coupled CCD (charge coupled device) to acquire digitized X-ray images. The second generation uses direct conversion technology, i.e. flat panel detectors.
Contrast ratio: contrast refers to the measurement of the different brightness levels between the brightest white and darkest black areas in an image, i.e. the magnitude of the gray contrast in an image. The ratio of black to white of a picture, i.e. the gradation from black to white. The larger the contrast is, the more gradation from black to white is, and thus the richer the color expression is, the stronger the resolving power is.
Fig. 1 is a perspective view of a dynamic contrast detection plate for X-ray imaging according to an embodiment of the present invention.
As shown in fig. 1, the X-ray imaging dynamic contrast detection plate provided by the present invention includes: a step phantom 1, an arc phantom 2 and a contrast sheet 3.
The stepped die body 1 is of a solid stepped structure. The stepped die body 1 comprises a plurality of steps 101, and a raised positioning key 102 is arranged at the same end of each step 101.
The arc-shaped die body 2 is of a solid right-angle trapezoidal structure with an inclined plane being an arc surface. The lower bottom surface of the arc-shaped die body 2 is provided with a concave positioning key groove 201 matched with the positioning key 102.
The arc-shaped die body 2 is detachably mounted on any step 101 of the step die body 1 through the positioning key groove 201 and the positioning key 102.
The contrast sheet 3 is horizontally fixed on any one of the steps 101 of the step mold body 1, and the contrast sheet 3 is parallel to the bottom surface of the step mold body 1.
Further, the X-ray imaging dynamic contrast detection plate also comprises a support frame.
The contrast thin plate 3 is horizontally fixed on any one step 101 of the step die body 1 through a support frame, and the contrast thin plate 3 is parallel to the bottom surface of the step die body 1.
The number of the contrast sheets 3 is one or more. The thickness of the contrast thin plate 3 is far smaller than the heights of the stepped die body 1 and the arc die body 2.
The stepped die body 1, the arc die body 2 and the contrast thin plate 3 are all made of aluminum alloy materials.
The arc-shaped die body 2 or/and the contrast sheet 3 are/is arranged on any step 101 of the step model 1.
FIG. 2 is a top view of an X-ray imaging dynamic contrast detector plate in accordance with an embodiment of the present invention.
As shown in FIG. 2, when the X-ray is irradiated, the X-ray firstly reaches the contrast sheet 3, and then sequentially reaches the arc mold body 2 and the step mold body 1, the length of the lower bottom surface of the arc mold body 2 is equal to the length of the long side L1 of the step 101, the width of the lower bottom surface of the arc mold body 2 is equal to the length of the short side L2 of the step 101, and the length and the width of the contrast sheet 3 are both smaller than the length of the long side L1 of the step 101.
FIG. 3 is an elevation view of an arc die body and step die body combination according to an embodiment of the present invention.
As shown in fig. 3, the positioning key 102 and the positioning key groove 201 are used to snap-fit the arc-shaped mold body 2 onto the stepped mold body 1. The arc-shaped die body 2 is detachably mounted on any step 101 of the step die body 1 through the positioning key groove 201 and the positioning key 102.
Fig. 4 is a perspective view of a stepped phantom of an X-ray imaging dynamic contrast detection plate according to an embodiment of the present invention.
As shown in fig. 4, the step mold body 1 includes steps 101 and a positioning key 102, the step mold body 1 is provided with 10 steps 101, the bottom surface of the step mold body 1 refers to a plane where projections of the steps 101 are located together, and the corresponding long side L1 of each step refers to that each step takes an outer long side or that each step takes an inner long side.
Fig. 5 is a front view of a stepped phantom of an X-ray imaging dynamic contrast detector plate in accordance with an embodiment of the present invention.
As shown in fig. 5, the height difference Δ H1 between adjacent steps 101 is 5mm, the height H1 of the step die body 1 is the maximum thickness of the step die body 1, H11 is the height of one step of the carrier, H12 is the height of the other step of the carrier, and the bottom surface of the step die body 1 is the surface contacting with the ground. Fig. 6 is a top view of a stepped mold body of an X-ray imaging dynamic contrast detection plate according to an embodiment of the present invention, wherein the numbers in the stepped mold body correspond to those in fig. 4.
Fig. 7 is a front view of an arc-shaped phantom of an X-ray imaging dynamic contrast detection plate according to an embodiment of the present invention.
As shown in fig. 7, the arc-shaped mold body 2 includes a recessed positioning key groove 201. The height H2 of the arc-shaped mold body 2 is the maximum thickness of the arc-shaped mold body 2, and the positioning key groove 201 is arranged on the lower bottom surface corresponding to the maximum thickness end of the arc-shaped mold body 2. The longest vertical distance delta h2 between the arc surface and the lower bottom surface of the arc-shaped die body is 30 mm; the shortest vertical distance delta h3 between the arc surface and the lower bottom surface of the arc-shaped die body 2 is 1 mm. Fig. 8 is a top view of an arc-shaped mold body of an X-ray imaging dynamic contrast detection plate according to an embodiment of the present invention, wherein the numbers in the figure correspond to those in fig. 7.
The specific parameters of the step mold body, the arc mold body and the contrast sheet provided by the embodiment of the invention are as follows: :
(1) step mould body
The length of the bottom surface of the stepped die body is 200mm, the width of the bottom surface of the stepped die body is 220mm, the height of the stepped die body is 50mm, 10 steps are arranged on the stepped die body, the height difference of two adjacent steps is 5mm, the short sides of the steps are both 20mm, the long sides of the steps are both 220mm, the contrast height range provided by the stepped die body is 5 mm-50 mm, the contrast area is 20mm × 200mm, and the stepped die body is used for high contrast (10-step contrast).
The same end of each step is provided with a raised positioning key which is matched with the positioning key groove of the arc-shaped die body to realize positioning.
When the ladder die body is used, the side face can also be used as the bottom face, the length of the bottom face of the ladder die body is 50mm, the width of the bottom face of the ladder die body is 220mm, the height of the ladder die body is 200mm, and 10 same ladders are arranged on the ladder die body. The height difference between two adjacent steps is 20mm, and the step model is used for a step with higher contrast (contrast of 10 steps).
(2) Arc-shaped mould body
The length of the lower bottom surface of the arc-shaped die body is 220 mm; the width of the lower bottom surface of the arc-shaped die body is 20 mm; the length of the upper bottom surface of the arc-shaped die body is 20 mm; the width of the upper bottom surface of the arc-shaped die body is 20 mm; the radius of the cambered surface of the arc-shaped die body is 680 mm; the height of the arc-shaped die body is 30 mm. The bottom of the thickest end of the arc-shaped die body is provided with a positioning key groove which can be matched with a positioning key of the stepped die body to realize positioning.
The shortest vertical distance between the arc surface and the lower bottom surface of the arc-shaped die body is 1mm, the longest vertical distance between the arc surface and the lower bottom surface of the arc-shaped die body is 30mm, namely the arc-shaped die body is in a range of 200mm in the horizontal direction, the vertical height is continuously and gradually changed to be 1 mm-30 mm, the total height difference is 29mm, the contrast test is realized, the change range of the contrast height is 1 mm-30 mm, the gradually-changed area of the contrast is 20mm × 200mm, and the continuous change of the contrast is realized.
(3) Contrast sheet
The total of four contrast sheets are 100mm × 100mm with the same area size, and the thicknesses of 0.01mm, 0.008mm, 0.006mm and 0.002mm respectively.
Namely, the four contrast sheets are:
the area is 100mm × 100mm, and the thickness is 0.002 mm.
Area 100mm × 100mm, thickness 0.006 mm.
The area is 100mm × 100mm, and the thickness is 0.008 mm.
The area is 100mm × 100mm, and the thickness is 0.010 mm.
The four contrast sheets can be mutually overlapped for use, 16 combinations are formed, the thickness is discretely changed from 0.002mm to 0.026mm, and 16 contrasts are realized.
In the use process of the detection plate provided by the embodiment of the invention, the contrast thin plate is placed at the uppermost part, the step die body is placed at the lowermost part, and the arc die body can be placed on the steps of the step die body, so that the observation of gradient contrast in a certain contrast range can be realized. In addition, in order to observe contrast gradual change in different ranges, the arc-shaped phantom can be movably placed on different steps of the stepped phantom. Meanwhile, in order to observe extremely low contrast, the contrast change can be observed by adopting the combination of the contrast sheets.
The principle analysis of the detection board provided by the embodiment of the invention comprises the following steps:
FIG. 9 is a schematic diagram of contrast ratio testing according to an embodiment of the present inventionIntention is. As shown in fig. 9, S denotes a focal point of the X-ray machine, and the distance from S to the arc is 680mm, which ensures that the X-ray is perpendicularly incident on the arc interface of the arc mold body 2. SEiIndicating an angle of α from verticaliThe ith beam of X-rays of (1), the ray SEiPasses through the arc-shaped die body 2 and intersects with the arc surface at DiA step B from the step mold body 1jBottom surface is crossed with EiAn imaged unit PiAnd receiving. In fig. 9, CF is 1.00mm, and SC is R is SDiA certain step thickness FO ═ BjI detection units, through which the radiation passes by a thickness di＝DiEi. Then:
the following can be obtained:
wherein E isi(Pi) Is denoted as PiCoordinates of where, αi∈[0,17.1°]，diIs a monotonically increasing function and is an increasing function of increasing incremental changes.
The adjacent thickness difference can be obtained:
diis determined by the detector pixel size and the distance of the pixel from the point O, Δ di+1,iIs a monotonically increasing function. Such as: the total height of the arc-shaped die body is changed to 29mm, 200 detection units are distributed in the range of 200mm, and the average change is 29 mm/200-0.145 mm; if the detecting units are distributed in 1000, the average change is 29 mm/1000-0.029 mm. Because the cosine function is nonlinear, the actual variation will vary with the angle, and the smaller the angle, the smaller the variation, and the higher the thickness resolution.
For example, the step height of the step mold body is 20mm, αi∈[0,15.9°]，i∈[1,1000],Ei(Pi)∈[0,200]And then:
the following can be obtained:
Δd11,10＝d11-d10the thickness difference of the phantom body penetrated by the rays received by the adjacent imaging units becomes larger as i is increased, wherein the thickness difference is 0.0006 mm; as i decreases, the difference in phantom thickness through which radiation received by adjacent imaging units passes becomes smaller, less than 0.0006 mm. Thus, the thickness variation can be as small as 0.001 mm.
In the existing CR/DR of a hospital, the resolution is generally 2-5 lines/mm, namely 2-5 pixels/mm, the number of pixels in the range of 200mm is 400-1000, and the contrast change formed by an arc-shaped die body can reach 0.001 mm.
The technical effects realized by the detection board provided by the embodiment of the invention are as follows:
1. the wide contrast range is realized, and the gray scale range of X-ray imaging is detected.
The contrast of the existing phantom is generally analyzed in the range of less than 20%. The contrast of the detection board provided by the embodiment of the invention is as follows:
contrast sheet 16 steps: 0.002 mm-0.026 mm.
10 steps of the stepped die body: 5 mm-50 mm, 5.0mm apart; 20 mm-200 mm, and the interval is 20 mm.
The arc of the arc-shaped die body gradually changes: the thickness of the arc is changed by 1 mm-30 mm, and the extension length is gradually changed by 200 mm.
The three contrast components can be combined to generate contrast with a wider range, the combined contrast range is 0.002 mm-80 mm, the contrast can be expanded to 200mm, and the contrast can be gradually changed in a 100% range.
2. And meanwhile, high and low contrast ratios are realized, and the gray scale range of X-ray imaging is detected.
The single combination of the arc-shaped die body and the stepped die body simultaneously realizes high and low contrast, the contrast range is 1 mm-80 mm, and the contrast change is 0.145mm in the vertical direction caused by every millimeter of horizontal direction change.
The contrast of the participating combinations is:
10 steps of the stepped die body: 5 mm-50 mm, 5.0mm apart; 20 mm-200 mm, and the interval is 20 mm.
The arc of the arc-shaped die body gradually changes: the thickness of the arc is changed by 1 mm-30 mm, and the extension length is gradually changed by 200 mm.
3. The dynamic observation of the low-contrast gradual change situation in different contrast ranges is realized.
The arc-shaped die body and the stepped die body are combined for many times, and the position of the arc-shaped die body on the stepped die body is moved, so that the low contrast gradual change is observed in different contrast ranges.
The contrast of the participating combinations is:
10 steps of the stepped die body: 5 mm-50 mm, 5.0mm apart.
The arc of the arc-shaped die body gradually changes: the thickness of the arc is changed by 1 mm-30 mm, and the extension length is gradually changed by 200 mm.
4. An observation of extremely low contrast is achieved.
The contrast thin plate, the arc-shaped die body and the stepped die body are combined for multiple times, the position of the arc-shaped die body on the stepped die body is moved, the contrast thin plate is combined, and the extremely low contrast is observed in different contrast ranges.
The combined contrast is:
contrast sheet 16 steps: 0.002 mm-0.026 mm.
Gradual contrast ratio of the arc-shaped die body: 1 mm-30 mm.
10 steps of the stepped die body: 5 mm-50 mm, 5.0mm apart; 20 mm-200 mm, and the interval is 20 mm.
To summarize:
the arc-shaped die body and the step die body are combined to form different contrasts, and the contrast gradient in a certain contrast range can be observed.
And moving the position of the arc-shaped die body on the stepped die body to form different contrasts in different contrast ranges, observing the gradual change of the contrasts in the different contrast ranges, and observing the contrast change linearity.
The contrast thin plate is combined with the arc mold body and the step mold body to form extremely low contrast and test the resolution capability of the contrast.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. An X-ray imaging dynamic contrast detection plate is characterized by comprising a step die body and an arc die body;
the step die body is of a solid step structure; the step die body comprises a plurality of steps, and a raised positioning key is arranged at the same end of each step;
the arc-shaped die body is of a solid right-angle trapezoidal structure with an inclined plane being an arc surface; a concave positioning key groove matched with the positioning key is formed in the lower bottom surface of the arc-shaped die body;
the arc-shaped die body is detachably arranged on any step of the step die body through the positioning key groove and the positioning key.
2. The X-ray imaging dynamic contrast detection plate according to claim 1, wherein the shortest vertical distance between the arc surface and the lower bottom surface of the arc-shaped die body is 1 mm; the longest vertical distance between the cambered surface and the lower bottom surface of the arc-shaped die body is 30 mm.
3. An X-ray imaging dynamic contrast detection plate according to claim 1, characterized in that the number of steps of said step phantom is 10 and the height difference between adjacent said steps is 5 mm.
4. An X-ray imaging dynamic contrast detection plate according to claim 3, characterized in that the short sides of the steps are each 20mm in length; the length of the long edge of the ladder is 220 mm.
5. The X-ray imaging dynamic contrast detection plate of claim 4, wherein the X-ray imaging dynamic contrast detection plate further comprises a contrast sheet; the contrast thin plate is horizontally fixed above any one step of the step die body and is parallel to the bottom surface of the step die body; the bottom surface of the step die body is a plane where all the step projections are located together.
6. The X-ray imaging dynamic contrast detection plate of claim 5, further comprising a support frame; the contrast sheet is horizontally fixed on any step of the step mold body through the support frame.
7. The X-ray imaging dynamic contrast detection plate according to claim 5, wherein the materials of the step mold body, the arc mold body and the contrast thin plate are all aluminum alloy materials.
8. The X-ray imaging dynamic contrast detection plate of claim 5, wherein the number of the contrast sheets is one or more.
9. The X-ray imaging dynamic contrast detection plate of claim 5, wherein the number of the contrast sheets is 4; the thicknesses of the 4 contrast thin plates are 0.01mm, 0.008mm, 0.006mm and 0.002mm respectively; the length and width of the 4 contrast sheets are both less than the length of the long side of the step, and the length of the 4 contrast sheets and the width of the 4 contrast sheets are equal.
10. The X-ray imaging dynamic contrast detection plate according to claim 1, wherein the length of the lower bottom surface of the arc-shaped mold body is 220 mm; the width of the lower bottom surface of the arc-shaped die body is 20 mm; the length of the upper bottom surface of the arc-shaped die body is 20 mm; the width of the upper bottom surface of the arc-shaped die body is 20 mm; the radius of the cambered surface of the arc-shaped die body is 680 mm; the height of the arc-shaped die body is 30 mm.
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| CN201259534Y (en) * | 2008-09-23 | 2009-06-17 | 邱建峰 | Magnetic resonance quality control integrated test phantom |
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