Question

25 multiple choice 1 point all factors remaining constant, which of the following set of exposure conditions would yield the greatest image receptor exposure? 100 ma, .75 sec, 40\ sid 300 ma, .25 sec, 44\ sid 600 ma, 125 ms, 40\ sid 400 ma, 200 ms, 40\ sid 26 multiple choice 1 point all factors remaining constant, which of the following set of exposure conditions would yield an image with the highest image receptor (ir) exposure? 100 ma, .75 sec, 40\ sid, 70 kvp 150 ma, .25 sec, 44\ sid, 80 kvp 300 ma, 125 ms, 40\ sid, 70 kvp 400 ma, 187 ms, 56\ sid, 88 kvp

Explanation:

Step1: Recall the relationship for image - receptor exposure

Image - receptor exposure is proportional to the product of mA (milliamperes) and time (s or ms). First, convert all time units to seconds if necessary.

Step2: Calculate the product for each option in question 25

Option 1:

$100\ mA\times0.75\ s = 75\ mAs$

Option 2:

$300\ mA\times0.25\ s=75\ mAs$

Option 3:

$600\ mA\times0.125\ s = 75\ mAs$

Option 4:

$400\ mA\times0.2\ s=80\ mAs$

Step3: Calculate the product for each option in question 26

Option 1:

$100\ mA\times0.75\ s = 75\ mAs$

Option 2:

$150\ mA\times0.25\ s = 37.5\ mAs$

Option 3:

$300\ mA\times0.125\ s=37.5\ mAs$

Option 4:

$400\ mA\times0.187\ s = 74.8\ mAs$

Answer:

Question 25: 400 mA, 200 ms, 40" SID
Question 26: 100 mA, .75 sec, 40" SID, 70 kVp