Which statement is true regarding the relationship between matrix size and pixel size when the overall field of view is fixed?

Which statement is true regarding the relationship between matrix size and pixel size when the overall field of view is fixed?

• A. Pixel size increases
• B. Pixel size remains constant
• C. Pixel size decreases
• D. Pixel density decreases

Answer: (C)

When the overall field of view is fixed, increasing the matrix size means you have more pixels sampling the same scene. To cover the same view with more pixels, each pixel must represent a smaller portion of the scene, so the size of each pixel becomes smaller. At the same time, you’re packing more pixels into the same image area, so pixel density increases. Thus, the statement that pixel size decreases is the correct one. The other ideas would imply fewer samples or less detail, which isn’t the case when you add more pixels to a fixed view.

When the overall field of view is fixed, increasing the matrix size means you have more pixels sampling the same scene.

To cover the same view with more pixels, each pixel must represent a smaller portion of the scene, so the size of each pixel becomes smaller. At the same time, you’re packing more pixels into the same image area, so pixel density increases.

Thus, the statement that pixel size decreases is the correct one. The other ideas would imply fewer samples or less detail, which isn’t the case when you add more pixels to a fixed view.