Test Bank For Radiologic Science for Technologists, 11th Edition by Stewart C. Bushong

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Test Bank For Radiologic Science for Technologists, 11th Edition by Stewart C. Bushong

The inverse square law has the same effect on optical density and x-ray . a. b. c. d. intensity exposure quantity all of the above ANS: D The inverse square law has the same effect on x-ray intensity, x-ray exposure, x-ray quantity, and optical density. DIF: Moderate REF: page 139 OBJ: List and discuss the factors affecting the intensity of the x-ray beam. 11. An increase of 15% in kVp is equivalent to increasing mAs . a. 15% b. 30% c. 50% d. 100% ANS: D An increase of 15% in kVp is equivalent to increasing mAs 100%. DIF: Moderate REF: page 139 OBJ: Calculate changes in the factors affecting the intensity of the xray beam. 12. If the intensity of a 70 kVp exposure at 20 mAsis 1.0 mGya , what would it be at 5 mAs? a. 0.25 mGya b. 0.5 mGya c. 2.0 mGya d. 4.0 mGya ANS: A If the intensity of a 70 kVp exposure at 20 mAs is 1.0 mGya, it would be 0.25 mGya at 5 mAs because exposure is proportional to mAs. DIF: Moderate/Difficult REF: page 138 OBJ: Calculate changes in the factors affecting the intensity of the x- If an exposure is 0.5 mGya at an SID of 40 inches, what would the exposure be at an SID of 60 inches? a. 0.22.2 mGya b. 0.333 mGya c. 0.75 mGya d. 1.125 mGya ANS: A If an exposure is 0.5 mGya at an SID of 40 inches, it would be at 0.222 mGya at an SID of 60 inches because of the inverse square law. DIF: Difficult REF: page 139 OBJ: List and discuss the factors affecting the intensity of the x-ray beam. 14. X-ray intensity is proportional to . a. distance b. kVp c. kVp2 d. filtration ANS: C X-ray intensity is proportional to kVp2. DIF: Moderate REF: page 138 OBJ: List and discuss the factors affecting the intensity of the x-ray beam. 15. The penetrability of an x-ray beam is called x-ray . a. quantity b. quality c. intensity d. all of the above ANS: B The penetrability of an x-ray beam is called x-ray quality. DIF: Moderate REF: page 140 OBJ: Explain x-ray quality and penetrability

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