Question

a radiograph acquired on a non - compliant patient demonstrates appropriate exposure but significant motion blur. if the original technique was 100 milliamperes (ma) and 0.5 seconds (s), what new technique will decrease motion artifact while maintaining the same total exposure?
○ 50 ma and 1.0 s
○ 250 ma and 0.5 s
○ 500 ma and 0.1 s
○ 500 ma and 0.5 s

Explanation:

Step1: Recall exposure formula

Exposure (in mAs) is \( \text{mA} \times \text{time (s)} \). Original exposure: \( 100 \, \text{mA} \times 0.5 \, \text{s} = 50 \, \text{mAs} \).

Step2: Check each option

• 50 mA × 1.0 s = 50 mAs (same exposure, but time increased—worse motion).
• 250 mA × 0.5 s = 125 mAs (too much exposure).
• 500 mA × 0.1 s = 50 mAs (same exposure, time decreased—reduces motion).
• 500 mA × 0.5 s = 250 mAs (too much exposure).

Answer:

500 mA and 0.1 s