Question

29 multiple choice 1 point the length of the exposure time (s) for a radiograph, is used to primarily control image contrast. motion distortion. radiographic image density. patient dose. 30 multiple choice 1 point you have taken a digital radiograph that yields an ei# of 75. the recommended target ei# for this projection is 125. when you repeat the image, you will achieve the desired results by decreasing the mas from 12 mas to 9 mas increasing the mas from 15 mas to 25 mas increasing your sid from 40\ to 44\ increasing you kvp from 85 kvp to 98 kvp with no mas compensation

Explanation:

1. For the first question, the exposure - time in radiography primarily controls the radiographic image density. Longer exposure times allow more x - rays to reach the image receptor, increasing density. Image contrast is mainly controlled by kVp, motion distortion by exposure time and patient movement, and patient dose is related to multiple factors but not the primary function of exposure time control.
2. For the second question, the Exposure Index (EI#) is related to the mAs (milliampere - seconds). EI# is proportional to mAs. The current EI# is 75 and the target is 125 (higher). Since EI# is proportional to mAs, increasing mAs will increase the EI#. Increasing mAs from 15 mAs to 25 mAs will increase the EI# towards the target value. Decreasing mAs will decrease EI#, increasing SID will decrease the radiation intensity reaching the detector (decreasing EI#), and increasing kVp without mAs compensation may not directly and proportionally increase EI# to the target value as effectively as changing mAs.

Answer:

1. radiographic image density
2. increasing the mAs from 15 mAs to 25 mAs