1. The spiral CT that completes whole-heart dynamic functional imaging in one lap scan is:
A. 16-slice
B. 32-slice
C. 640-slice
D. Dual-source CT
2. When intervertebral disc CT scanning, the tilt angle of scanning frame is based on:
A. Parallel to vertebral spine
B. Perpendicular to vertebral body
C. 15 degrees to vertebral body
3. p> B. Perpendicular to the vertebral body
C. 15?
D. 45?
3. CT scanning of the liver, the photo needs to lower the window position is:
A. Large amount of ascites
B. Liver abscess
C. Severe fatty liver disease
D. Cirrhosis
4. To differentiate hepatocellular carcinoma from hepatic hemangioma, the scanning method that can be used is:
A. Plain scanning
B. Thin-layer scanning
C. Target scanning
D. Enhancement scanning
5. With regard to CT perfusion, the incorrect description is:
A. CT perfusion imaging is a type of functional imaging
B. The data are collected in the contrast B. Data are acquired in the contrast first pass time window
C. It has simple scanning equipment and short imaging time
D. Intravenous injection of CT contrast is required
E. Red color in the perfusion map indicates low perfusion, and black color indicates high perfusion
6. Regarding the advantages of the clinical application of multislice helical CT, the incorrect statement is that:
A. Scanning speed is improved remarkably
B. Scanning speed is increased significantly
C. The scanning speed is increased significantly
D. The scanning time is decreased by the time window of the first pass time window of the first pass time of contrast
B. Improved spatial resolution of images
C. More accurate localization of CT fluoroscopy
D. More accurate multi-phase enhancement of scanning phase
E. Reduced utilization of X-rays
Reference Answer and Explanation
1. Reference Answer C. Explanation: temporal resolution is a key factor in cardiac The 640-slice dynamic volumetric scanning is a huge step forward in the history of CT development with its unique breakthrough technology that allows for whole-organ imaging, dynamic volumetric functional imaging, whole-organ perfusion, and cardiac acquisition in a single heartbeat.
2. Reference answer A. Analysis: When doing intervertebral disc scanning should be based on the angle of the intervertebral space, so that the frame tilted parallel to the intervertebral space scanned.
3. Answer C. Explanation: The CT window technique. Raise the window position, the image becomes black, lower the window position, the image becomes white; if the display part of the image density is low, can be adjusted to lower the window position, if the display part of the image density is high, can be adjusted to higher the window position; therefore, severe fatty liver CT shows that the density of the liver is uniformly lowered, in order to better display the lesion need to lower the window position to make the image white and thus a better formation of contrast and better observation of the lesion.
4. Reference answer D. Explanation: The differential diagnosis of hepatic cavernous hemangioma and hepatocellular carcinoma is examined. Contrast enhancement scan is the key to differentiate hepatic cavernous hemangioma from hepatocellular carcinoma. After enhancement scanning, all enhancement processes of hepatocellular carcinoma show ? fast in and fast out? and hepatic cavernous hemangioma showed the characteristics of "fast in and out". The enhancement process of hepatic cavernous hemangioma was characterized by "fast in and out". The results of this study are summarized in the following table.
5. Reference answer E. Analysis: CT perfusion imaging, CT perfusion imaging is the intravenous injection of contrast agent on the selected level of a number of consecutive dynamic scanning, in order to obtain the level of the time density of each pixel within the level of the time density curve (TDC), and then according to the curve of the use of different mathematical models calculated by the various parameters of the organization of the perfusion of the blood flow, and through the color gradient assigned to form perfusion images, in order to evaluate the organization of the organs and organs. CTPI can reflect the degree of vascularization and perfusion of tissues, and obtain hemodynamic information, which is functional imaging. The red color in the perfusion volume, tissue blood flow, and tissue blood volume graphs indicates high perfusion, and the black color indicates low perfusion.
6. Answer E. Explanation: The advantages of multislice CT in clinical application. Multi-slice CT is a spiral CT device with multiple rows of detectors, and the X-ray tube rotates every week to complete the acquisition of volumetric data and reconstruction of multiple levels of the image. The advantages of the clinical application of multilayer spiral CT are as follows: (1) scanning speed is significantly increased; (2) image spatial resolution is improved; (3) CT fluoroscopy positioning is more accurate; (4) improve the utilization of X-ray: compared with a single-layer spiral CT, to obtain the same quality of the image image, the multilayer spiral CT X-ray volume is reduced by about 40% to 66%. Therefore, choose E.
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