What happens to pixel size when the display field-of-view is decreased?

What happens to pixel size when the display field-of-view is decreased?

• A. Increases
• B. Decreases
• C. Remains constant
• D. Varies with patient size

Answer: (B)

When the display field-of-view (FOV) is decreased, the pixel size decreases as well. The relationship between FOV and pixel size is inversely proportional; this means that as the size of the area being displayed on the screen becomes smaller, each pixel covers a smaller portion of that area. In CT imaging, the pixel size is determined by the display FOV divided by the matrix size. When the FOV decreases and the matrix size remains constant, each pixel must become smaller to accommodate the reduced area, resulting in a higher spatial resolution. This enhanced resolution allows for more detailed images, which can be critical in accurately diagnosing conditions. Thus, decreasing the display FOV results in smaller pixels, leading to finer detail in the images produced.

When the display field-of-view (FOV) is decreased, the pixel size decreases as well. The relationship between FOV and pixel size is inversely proportional; this means that as the size of the area being displayed on the screen becomes smaller, each pixel covers a smaller portion of that area.

In CT imaging, the pixel size is determined by the display FOV divided by the matrix size. When the FOV decreases and the matrix size remains constant, each pixel must become smaller to accommodate the reduced area, resulting in a higher spatial resolution. This enhanced resolution allows for more detailed images, which can be critical in accurately diagnosing conditions.

Thus, decreasing the display FOV results in smaller pixels, leading to finer detail in the images produced.