Which of the following imaging examinations does not require radiation protection (辐射防护) for the patients? （）
A. magnetic resonance imaging (MRI)
B. plain CT scan
C. digital radiography （DR）
D. enhancement CT scan
E. soft X-ray radiography
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Which of the following imaging examinations does not use X-ray? （）
A. computed radiography (CR)
B. digital radiography (DR)
C. plain CT scan
D. enhancement CT scan
E. magnetic resonance imaging (MRI)
For different imaging techniques and their clinical application, which of the following statements is correct? ()
A. X-ray imaging is suitable for all parts of human body
B. X-ray contrast examination is suitable for the digestive tract
C. MRI can completely replace CT Examination
D. CT is superior to MRI for displaying soft tissue
E. When both MRI and CT can be used, CT should be the first choice.
解释四句口诀：“三颠倒，找基极；PN结，定管型；顺箭头，偏转大；测不准，动嘴巴。”
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