American Registry of Radiologic Technologists (ARRT) Practice Exam

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What effect does larger pixel size have on resolution?

Improves it

Decreases it

Larger pixel size decreases resolution because resolution refers to the amount of detail in an image, which is largely determined by the size of the individual pixels that compose it. When pixel sizes increase, each pixel can capture more light and detail; however, because there are fewer pixels in a given area, the overall ability to provide fine detail diminishes.

In imaging modalities, smaller pixels allow for finer resolution and more detailed images since each pixel can represent a smaller portion of the subject being imaged. Conversely, larger pixels lead to a situation where larger areas are being averaged out, hindering the ability to discern smaller structures or subtle differences in density within the image. Therefore, the relationship between pixel size and resolution is inverse, making larger pixels detrimental to achieving higher resolution images.

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No effect

Makes it inconsistent

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