The WEK-DSA phantom is used to evaluate the digital function of the DSA system; the phantom adopts a new design, which greatly improves the quality of subtraction angiography. Contrast range, resolution, linearity, consistency, amplifier dynamic range, matching accuracy and subtraction effectiveness can be checked, and quantitative measurements can be made to measure high and low contrast spatial resolution. Easy-to-understand results are provided.
WEK-DSA phantom complies with the Association of Physicists in Medicine (AAPM) Report No. 15, IEC61223-3-1, and CE certification.
WEK-DSA phantom is a Digital Subtraction Angiography QA Test Phantom
A.1. Simulated arterial minimum resolution size and motion artifact detection module
Contrast agent concentration: 150mg/mL, 300mg/mL, three simulated blood vessels, width and thickness are 1.0, 2.0 and 4.0mm respectively, each tube has simulated arterial stenosis and aneurysm, the width is 1/4, 1/2 and 3/4 of the width of a single artery, the module size is 300x150x25mm, as shown in Figure A.2.
Figure A.2 Simulate the minimum resolution size of arterial vessels and motion artifact detection module
A.2. Low-contrast iodine line pair test plug-in
The module has 3 groups of iodine contrast agent test line groups, each group of lines consists of 4 lines with different diameters,0.5, 1.0, 2.0 and 4.0 mm respectively. The iodine contrast agent concentrations of the 3 groups of lines are 2.5, 5.0 and 10.0 mg/cc respectively.
The module size is 300x150x25mm, as shown in Figure A.3.

Figure A.3 Low-contrast iodine line pair test plug-in
A.3. High contrast resolution test plug-in
Used with line pair cards, there are grooves for line pair cards on the test board, which can support horizontal, vertical and 45-degree rotation of line pair cards. The size of the line pair card is 50x50mm. The module size is 200x150x25mm.

A.4. Image linearity test plug-in
There are six 19mm test areas distributed in a circle on the test board, with different iodine thickness and triiodine concentration, 20.0, 10.0, 4.0, 2.0, 1.0, 0.5mg/cm³, and the size is 200x150x25mm, as shown in Figure A.5.

Figure A.5 Image linearity test plug-in
A.5. Bone simulation test block
Contains three types of PTFE strips simulating bones, with a width of 25mm and thicknesses of 5, 10, and 15mm. The size is 200x200x25mm, as shown in Figure A.6.

Figure A.6 Bone simulation test block
A.6. Blank insert
A plexiglass module of uniform material with dimensions of 200x150x25mm, as shown in Figure A.7.

Figure A.7 Blank Insert
A.7. Step wedge test block
Six step blocks (each 25.5 mm high) form a module. When the top three and the bottom three are "folded", they can become a module of 200x200x76.5 mm in size. See Figure A.8.

Figure A.8 Step wedge test Block
A.8. Matching plate
Made of aluminum, full of 3.2mm holes, size: 200x200x2mm
A.9. Slot block (phantom base)
The phantom has an opening that can be used to fix and position other modules, and to place different modules to achieve different parameter measurements. Module outer dimensions: 200x200x77mm, slot dimensions: 200x150x25mm.

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