Computed Tomography Technologist Practice Exam 2025 - Free CT Technologist Practice Questions and Study Guide

Question: 1 / 615

What effect does decreasing pixel size have on the number of detected x-ray photons per pixel?

It increases

It decreases

Decreasing pixel size impacts the number of detected x-ray photons per pixel by reducing the area over which the x-ray photons can be gathered. Each pixel in a CT image corresponds to a specific portion of the radiation data collected, and when the pixel size is smaller, each pixel captures fewer photons simply because it covers a smaller area.

As a result, smaller pixels can lead to a decrease in the overall number of x-ray photons detected within each pixel. This can compromise the signal-to-noise ratio, since fewer photons may lead to increased noise levels in the imaging process. On the other hand, smaller pixel sizes can enhance spatial resolution, but this gain comes at the cost of sensitivity, as there are fewer photons to contribute to the image quality within those reduced pixel areas. Therefore, the correct choice reflects a direct consequence of pixel size reduction in relation to x-ray photon detection.

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No effect

It varies based on equipment

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