How do you calculate the milliampere-seconds (mAs) when using 70 kVp, 300 mA, and a 0.1 second exposure time?

How do you calculate the milliampere-seconds (mAs) when using 70 kVp, 300 mA, and a 0.1 second exposure time?

• A. 4 mAs
• B. 7 mAs
• C. 30 mAs
• D. 370 mAs

Answer: (C)

To calculate the milliampere-seconds (mAs), you use the formula mAs = mA × time (in seconds). In this case, you have a current of 300 mA and an exposure time of 0.1 seconds. By applying the formula: mAs = 300 mA × 0.1 s mAs = 30 mAs. This result makes it clear that the correct calculation of milliampere-seconds for the given parameters is indeed 30 mAs. The units balance correctly, confirming that this is the intended measurement for the exposure factors involved in radiographic imaging, correlating directly with the technique used in the procedure.

To calculate the milliampere-seconds (mAs), you use the formula mAs = mA × time (in seconds). In this case, you have a current of 300 mA and an exposure time of 0.1 seconds.

By applying the formula:

mAs = 300 mA × 0.1 s

mAs = 30 mAs.

This result makes it clear that the correct calculation of milliampere-seconds for the given parameters is indeed 30 mAs. The units balance correctly, confirming that this is the intended measurement for the exposure factors involved in radiographic imaging, correlating directly with the technique used in the procedure.