Basic knowledge of medical imaging over the years (34)-Tianjin medical and health in 2020

Basic knowledge of medical imaging over the years (34)-Tianjin medical and health in 2020

1. Which is not the post-processing technology of spiral CT?

A. Maximum density projection

B. Surface masking display

C. Multiplane recombination

D. Dynamic enhanced scanning

E.CT virtual endoscope

2. The post-processing technology of CT scanning in the examination of sellar region of central nervous system does not include:

A. If the density of the lesion is close to the surrounding tissue, the width of the window can be appropriately reduced.

B. Flexible selection of window width and window position according to different parts and lesions.

C. If there are many artifacts or you need to observe the rich layers of local tissues, you can lower the window level and widen the window width appropriately.

D. If there are many artifacts or the rich layers of local tissues need to be observed, the window level can be increased and the window width can be appropriately reduced.

E. soft tissue window and bone window are commonly used in CT images of sellar region.

3. Post-processing of 3.CT angiography, which of the following is incorrect:

A.VE can show calcification of blood vessel wall.

B.SSD is helpful to show calcification of blood vessel wall.

C.MIP shows the most accurate blood vessel diameter.

D.MIP is beneficial to display smaller blood vessels.

E.SSD can display the stereoscopic relationship of blood vessels.

4. The characteristics of electronic amplification in 4.CT image post-processing are:

A. enlarge the image with the same number of pixels.

B. Enlarge the image and increase the number of pixels in proportion.

C. enlarge the image and reduce the number of pixels proportionally.

D. Enlarge the image by 2 times and increase the pixels by 4 times.

E. Enlarge the image by 2 times and reduce the pixels by 4 times.

5. About the post-processing technology of brain CT scanning, the incorrect description is:

A. brain window photography is often used for brain CT images.

B the window width of brain window is 300 ~ 400 Hu, and the window position is about 35HU.

C. Craniocerebral trauma and skull lesions must be added with bone window.

D bone window width 1000 ~ 1400 Hu, window position 300 ~ 500 Hu.

E. shoot the soft tissue lesions under the scalp with the soft tissue window.

6. Which of the following CT image post-processing methods does not belong to 3D display:

A. Malleable Iron Pipe

B. Virtual reality

C. Cardiopulmonary resuscitation

D. have

E. (same as solid-statedisk) solid-state (magnetic) disk

Reference answer and analysis

1. Reference answer D. Analysis: Spiral CT adopts volume scanning, which has the advantages of faster scanning speed, wider coverage, thinner slice thickness, greatly improved resolution on Z axis, and isotropic multi-plane reconstruction, so it can carry out various image post-processing technologies, mainly including multi-plane reconstruction, surface masking display, maximum density projection, volume reconstruction and CT virtual endoscope.

2. Reference answer D. Analysis: If there are many artifacts or you need to observe the rich levels of local tissues, you can lower the window level.

3. Reference answer B. Analysis: MIP is mostly used for blood vessel imaging, and the processed blood vessel diameter is relatively reliable. At present, it is often used as a standard to measure vascular dilatation or stenosis, and because it can display different degrees of density, it can simultaneously observe calcification of blood vessels and blood vessel walls.

4. Reference answer A. Analysis: The electronic amplification in post-processing is only an electronic enhancement amplification, and the number of pixels cannot be changed by using the function of the software.

5. Reference answer B. Analysis: the window width of the brain window is 80 ~ 100 Hu, and the window level is about 35HU. B error.

6. Reference answer C. Analysis: The three-dimensional post-processing methods of CT images include surface shadow display (SSD), maximum density projection (MIP), volume demonstration (VR) and virtual endoscope (VE).

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