Exposure ch. 26

Because of the "anode heel effect," x-ray beam intensity A. is greater under the cathode side of the tube B. is greater under the anode side of the tube C. is equal across the beam D. changes with patient position

A

Which factor influences the average energy of photons reaching the IR? A. kVp B. mAs C. focal spot size D. mA

A

Focal spot blooming occurs with A. high kVp B. high mA exposures C. Large SIDs D. extreme tube angulation

B

The principal controlling factor of radiographic receptor exposure is A. kVp. B. mAs C. focal spot size D. filtration thickness

B

Which factor influences the number of photons reaching the IR? A. kVp B. mAs C. focal spot size D. exposure time

B

Which generator type produces the least amount of receptor exposure per mAs? A. three-phase, 6-pulse B. single-phase, 2-pulse C. three-phase, 12-pulse D. a high-frequency generator

B

Which statement is TRUE? A. As mAs increases, scatter decreases B. As mAs decreases, quantum noise can appear C. As mAs increases, remnant radiation decreases D. As mAs decreases, exposure increases logarithmically

B

The effect of mAs upon IR exposure is A. inverse B. inversely proportional C. directly proportional D. dependent upon kVp

C

The greatest factor in the production of scatter radiation is A. kVp B. mAs C. patient thickness D. patient position

C

The relationship between exposure and SID is A. directly proportional B. inversely proportional to the cube of the distance C. inversely proportional to the square of the distance D. directly proportional to the square of the distance

C

You have completed a chest radiograph using 3 mAs @ 110 kVp. The image shows obvious under penetration of the mediastinal anatomy. The professional radiographer would A. increase kVp by 3 kVp and repeat the exposure B. use the 15% Rule and reduce the kVp and increase the mAs C. increase the kVp to 120 kVp and repeat the exposure at the same mAs D. remove the beam filtration and repeat the exposure

C

Assessment of digital radiographic image quality includes A. looking at the window/level values on the monitor B. electronic masking the image to improve the exposure indicator value C. postprocessing the image to enhance image contrast D. referencing exposure indicators values for acceptance

D

The 15% rule will affect A. recorded detail B. distortion C. image brightness D. none of these

D

The brightness of the image on a viewing monitor is A. the result of receptor exposure B. the result of the tissue density C. the result of the tissue thickness D. a function of the monitor

D. a function of the monitor