1. The significance of CTA in the diagnosis of arterial entrapment is incorrectly:
A. Determination of orifice location
B. Staging diagnosis
C. Interventional therapy
D. Blood supply vessels of major organs
E. Qualitative diagnosis
2. The following image post-processing methods belong to the 2D reorganization and display:
A.SSD
B.MPR
C.MIP
D.VP
E.VR
3. The one that does not belong to the indications for CT scanning of the spine is:
A.Herniated intervertebral discs
B.Spinal canal stenosis
C.Tuberculosis of the spine
D .Spondylitis
E.Congenital variant
4. The clinical advantages of dual-source CT are incorrect:
A. Increased radiation dose for cardiac examination
B. Dual-energy CT data can be obtained
C. Time-resolution up to 66 milliseconds
D. Characterization of the substances in target site can be performed
E. Time resolution is increased
5. Narrowing the window width changes the CT image by:
A. Image layers decrease, tissue contrast remains the same
B. Density resolution increases, image is clearer
C. Image layers increase, tissue contrast decreases
D. Spatial resolution increases, image is clearer
E. Decrease in image layers and increase in tissue contrast
6. The most widely used intravenous injection method for CT enhancement is:
A. Drip infusion method
B. Drip-high-dose rapid injection method
C. Single-high-dose rapid injection method
D. High-dose rapid injection-drip method
E. Multiple high dose rapid Injections
Reference Answer and Analysis
1. Answer C. Analysis: CTA of aortic coarctation can detect the endothelial calcification and internal migration, and can determine the location of the rupture and define the type of classification, but CTA can not realize the interventional treatment of arterial coarctation.
2. Reference answer B. Analysis: the examination of CT image post-processing technology. CT image post-processing technology: mainly refers to the use of volumetric data for 2D or 3D image reorganization processing. Commonly used are multi-planar reorganization (MPR), multi-layer volume reproduction (MPVR), surface masking display (SSD), volume reproduction (VR), simulated endoscopy (VE), vascular probe technology (VP), etc. Among them, multi-planar reorganization (MPR), multi-layer volume reproduction (MPVR), surface masking display (SSD), volume reproduction (VR), simulated endoscopy (VE), vascular probe technology (VP) and so on. Among them, multiplanar reorganization (MPR) and curved surface reorganization (CPR) belong to 2D image post-processing techniques.
3. In the examination of spinal diseases, CT examination can be used to diagnose spinal tuberculosis, intervertebral space narrowing, intervertebral disc herniation, and congenital variations of the spine, etc. Because of the limited diagnostic value of CT on the spinal cord and other soft tissues, so it is often not used in the diagnosis of myelitis.
4. Dual-source CT is a scanner frame with two X-ray tubes and two detector systems placed at 90 degrees to each other. Dual-source CT has the following advantages: (1) improved time resolution; (2) dual-energy CT data can be obtained; (3) lower radiation dose for cardiac examinations.
5. Refer to answer E. Explanation: The knowledge of window width. Window width refers to the CT value range included in the 16 gray scale on the image, the density difference between normal tissue and lesion tissue is large, the need to use a wide window width to show the difference in density between the two lesions; smaller, the application of a narrow window width in order to show the lesion. Increase the width of the window, the image level increases, the tissue contrast decreases, the details show poor; narrow the window width, the image level decreases, the tissue contrast increases.
6.Reference answer C. Analysis: the common method of contrast injection for CT enhancement examination, the most widely used intravenous injection method for CT enhancement examination is the single large-dose rapid injection method (intravenous regiment injection method).
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