In diagnostic imaging, what is the relationship between pixel size and matrix size?

• A. As matrix size increases, pixel size increases
• B. As matrix size increases, pixel size decreases
• C. Pixel size remains constant as matrix size changes
• D. Matrix size has no effect on pixel size

Answer: (B)

In diagnostic imaging, the relationship between matrix size and pixel size is inversely proportional. When the matrix size increases, it means that there are more pixels in the same imaging area. Because the number of pixels must fit into the same physical dimensions of the image, each individual pixel must become smaller. Therefore, as the matrix size increases, pixel size decreases.

A larger matrix provides greater spatial resolution, as smaller pixels enable more detail to be captured in an image. This is critical in diagnostic imaging where clarity and accuracy are vital for proper interpretation. Smaller pixels allow for finer details to be resolved, leading to improved image quality. Thus, the correct answer reflects this fundamental understanding of how image resolution is dependent on the relationship between matrix size and pixel size.