What does "mAs" stand for in radiology?

Question

Question

Answer 1

Correct Answer: Milliampere-seconds

Rationale:

In radiology, "mAs" stands for milliampere-seconds. It is a unit of measurement that reflects the total amount of electrical current passing through the X-ray tube over a specified period of time.
Milliampere-seconds (mAs) are crucial in determining the quantity of X-ray photons produced during an exposure, which directly affects the image quality and patient dose.
The formula for mAs is: mA (milliamperes) × exposure time (seconds) = mAs. This means that both the tube current and the exposure time contribute to the total mAs value.

Explanation of Other Options:

Mass and Absorption Spectrum

Rationale: This option is incorrect as it does not relate to the standard terminology used in radiology. "Mass and Absorption Spectrum" is not a recognized term in the context of X-ray technology or imaging parameters.

Milliamperes per second

Rationale: While this option might seem plausible, it is incorrect. The correct term is milliampere-seconds (mAs), which combines the tube current (measured in milliamperes) with the exposure time (measured in seconds).

Milliamperes per shot

Rationale: This option is incorrect. "Milliamperes per shot" is not a standard term in radiology. The correct term, milliampere-seconds (mAs), encompasses the entire exposure duration rather than per shot.

Conclusion:

Milliampere-seconds (mAs) are a fundamental parameter in radiology, affecting both the quality of the X-ray image and the radiation dose to the patient. Understanding the correct definition and usage of mAs is essential for accurate imaging and patient safety.