American Registry of Radiologic Technologists (ARRT) Practice Exam

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The use of high mAs results in what kind of production of photons?

Low number of photons

High number of photons

High mAs, which stands for milliamperes per second, directly correlates with the number of photons produced in an X-ray exposure. When the mAs is increased, it means that either the current (mA) or the time (s) of the exposure is increased, leading to a greater quantity of electrons being produced and subsequently being converted into X-ray photons.

This results in a higher output of X-ray photons, thus achieving better image quality, especially in areas where more detail or density is needed. High mAs can enhance the image density and improve the visibility of structures within the imaging area. However, it is essential to balance the mAs setting with other factors such as exposure time and patient safety to minimize the dose of radiation while still achieving the desired imaging quality.

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No photons

Variable number of photons

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