In annual Gy/mAs testing, which devices are used?

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Multiple Choice

In annual Gy/mAs testing, which devices are used?

Explanation:
The key idea is measuring beam output in a way that mimics patient exposure. Gy per mAs testing determines how much dose the beam delivers for a given mA·s by exposing a phantom and reading the resulting dose at a reference location. If the phantom used for the test already has dosimeters embedded in it (or a built-in dosimetry readout), you can obtain the Gy/mAs reading from the phantom itself without handling a separate dosimeter. That’s why phantom alone is listed as the correct choice in this context. If the phantom doesn’t have embedded dosimetry, you’d need a separate dosimeter placed in the phantom to measure the dose, which would involve using both devices.

The key idea is measuring beam output in a way that mimics patient exposure. Gy per mAs testing determines how much dose the beam delivers for a given mA·s by exposing a phantom and reading the resulting dose at a reference location. If the phantom used for the test already has dosimeters embedded in it (or a built-in dosimetry readout), you can obtain the Gy/mAs reading from the phantom itself without handling a separate dosimeter. That’s why phantom alone is listed as the correct choice in this context. If the phantom doesn’t have embedded dosimetry, you’d need a separate dosimeter placed in the phantom to measure the dose, which would involve using both devices.

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