What mAs value results from exposure factors of 300 mA, 0.017 second, and 72 kVp?

What mAs value results from exposure factors of 300 mA, 0.017 second, and 72 kVp?

• A. 5
• B. 50
• C. 500
• D. 5000

Answer: (A)

To calculate the mAs (milliampere-seconds) value, you multiply the current in milliamperes (mA) by the time in seconds (s). In this case, you have 300 mA and 0.017 seconds. The formula is: mAs = mA × time (in seconds) Substituting the given values: mAs = 300 mA × 0.017 s mAs = 5.1 When rounded, this yields an mAs value of approximately 5. The context of this calculation is important in radiography, as the mAs value directly affects the exposure of the image, influencing factors like image density and contrast. The correct choice aligns with this calculation, reinforcing the understanding that the mAs is a product of the tube current and the duration of the exposure in the imaging process.

To calculate the mAs (milliampere-seconds) value, you multiply the current in milliamperes (mA) by the time in seconds (s). In this case, you have 300 mA and 0.017 seconds.

The formula is:

mAs = mA × time (in seconds)

Substituting the given values:

mAs = 300 mA × 0.017 s

mAs = 5.1

When rounded, this yields an mAs value of approximately 5. The context of this calculation is important in radiography, as the mAs value directly affects the exposure of the image, influencing factors like image density and contrast.

The correct choice aligns with this calculation, reinforcing the understanding that the mAs is a product of the tube current and the duration of the exposure in the imaging process.