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放射科學研究所醫學影像原理

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中臺科技大學 98 學年度研究所碩士在職專班甄試入學試題卷

Choose any 5 of following questions to answer

1. Make a definition for each of the following terms (20%) (1) Compton effect

(2) Hard-copy (3) Grid ratio

(4) Positive beam limiting (PBL) (5) distortion

2. How much tissue will be imaged with a 5-mm beam width, a pitch of 1.6:1, and a 20-s image time at a gantry rotation time of 2 s? (20%)

3. Diagram the various layers of a CR imaging plate. (20%)

4. Explain how slip-ring technology contributed to the development of spiral CT? (20%)

5. A 64-slice examination is performed with a 32-mm x-ray beam width, and a 20-s examination at 0.5 s per revolution. What z-axis coverage is obtained?

The patient couch translates 32 mm each revolution. (20%) 6. Please describe the factors affecting scatter radiation (20%)

7. Diagram a procedure to describe the heel effect and give at least one example?

(20%)

8. Describe the factors affect x-ray quantity? (20%)

9. The exposure from an x-ray tube operated at 70 kVp, 200 mAs is 400 mR at 90cm. What will the exposure be at 180cm?

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