American Society of Radiologic Technologist (ASRT) Practice Exam 2025 – All-in-One Guide for Exam Success!

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The photomultiplier tube in a phosphor plate reader system converts:

Light to electrons.

The photomultiplier tube (PMT) in a phosphor plate reader system plays a crucial role in the detection process by converting light into an electrical signal. When a phosphor plate is exposed to ionizing radiation, it absorbs the energy and re-emits it as visible light. The PMT detects this emitted light and amplifies it, resulting in a stream of electrons proportional to the intensity of the light. This conversion is essential for digitizing the image and allows for further processing and analysis within the imaging system.

The role of the PMT is specific to the light emitted from the phosphor material and does not involve direct conversion of X-rays or digital data. Understanding this function clarifies why the focus is on the light signal produced by the phosphors in response to radiation exposure. Thus, the correct choice highlights the primary function of the photomultiplier tube in the reading and processing of data from the phosphor plate.

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X-rays to electrons.

Light to digital values.

X-rays to digital values.

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