Basic Medical Imaging Knowledge Past Exam Questions (34)-2020 Tianjin Medical Healthcare
1. Which is not a post-processing technique for helical CT:
A. Maximum Density Projection
B. Surface Masking Display
C. Multi-Planar Reconfiguration
D. Dynamic Enhanced scanning
E. CT simulation endoscopy
2. In the examination of the saddle region in the central nervous system, CT scanning post-processing techniques do not include:
A. If the density of the lesion and the surrounding tissues are close to each other, the window width can be appropriately narrowed
B. Flexible selection of the window width and the window position according to the different parts and lesions
C. If there are more artifacts or the local tissues need to be observed at rich levels, the window can be narrowed to the same width and window position
C. If there are more artifacts or it is necessary to observe the local tissues at rich levels, it can be used as the window width and window position. C. If there are more artifacts or if it is necessary to observe the rich layers of local tissues, the window position can be adjusted downward and the window width can be appropriately adjusted upward
D. If there are more artifacts or if it is necessary to observe the rich layers of local tissues, the window position can be adjusted upward and the window width can be appropriately narrowed
E. CT images of the saddle region are commonly used in the soft-tissue window and the bone window
3. Which one of the following is incorrect in the post-processing of CT vascular imaging:
A. VE can show calcification of the vessel wall
B. SSD is good for showing calcification of the vessel wall
C. MIP shows the most accurate vessel trajectory
D. MIP is good for showing smaller vessels
E. SSD can show the three-dimensional relationship of the vessels
4. The characteristic of electronic magnification in post-processing of CT images is:<
A. The number of pixels remains unchanged when the image is magnified
B. The number of pixels increases proportionally when the image is magnified
C. The number of pixels decreases proportionally when the image is magnified
D. The number of pixels increases 4 times when the image is magnified by 2 times
E. The number of pixels decreases 4 times when the image is magnified by 2 times
5. Regarding the post-processing technique of CT scans of the cranial brain, an incorrect description is given. Post-processing techniques, the incorrect description is:
A. Cranial CT images are commonly used for window photography
B. The window width of the brain window is 300-400 HU, and the window position is about 35 HU
C. Cranio-cerebral trauma and craniofacial lesions must be photographed in the bone window
D. The window width of the bone window is 1,000-1400 HU, and the window position is 300-500 HU
E. The window width of the bone window is 1,000-500 HU, and the window position is 1,000-500 HU
D. The window width of the bone window is 2,000-5,500 HU.
E. Subcutaneous soft-tissue lesions with soft-tissue window photography
6. Which of the following post-processing of CT images is not a three-dimensional display:
A. MIP
B. VR
C. CPR
D. VE
E. SSD
Reference Answer and Analysis
1. Reference Answer D. Analysis: Spiral CT, because of its volumetric scanning, faster scanning speed, large coverage, thin layer thickness, much higher resolution on the Z-axis, and isotropy in multiplanar reconstruction, is amenable to a wide range of image post-processing techniques, including, among others, multiplanar reorganization, surface masking displays, and maximal density projections, volumetric reproduction, and CT-simulated endoscopy.
2. Answer D. Explanation: If there are a lot of artifacts or you need to observe the richness of the local tissue, you can lower the window position
3. Answer B. Explanation: MIP is used for angiography, and the measurement of the vessel diameter is relatively reliable after the processing, which is currently used as a criterion for measuring vascular dilatation or stenosis, and it is also possible to observe vessels and vessel wall calcification at the same time, because of the ability to display the density of the different levels. and calcification of the vessel wall.
4. A. Resolution: Electronic magnification in post-processing is only a type of electronically enhanced magnification, which utilizes the software function of magnification and does not change the number of pixels.
5.Reference answer B. Analysis: The window width of the brain window is 80-100 HU, and the window position is about 35 HU. B is wrong.
6. Refer to Answer C. Ans: Three-dimensional post-processing of CT images includes Surface Masking Display (SSD), Maximum Density Projection (MIP), Volumetric Presentation (VR), and Simulated Endoscopy (VE).
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