What formula is used to determine pixel size?

• A. FOV multiplied by matrix size
• B. Matrix size divided by FOV
• C. FOV divided by matrix size
• D. Matrix size plus FOV

Answer: (C)

To determine pixel size in digital imaging, the correct approach involves dividing the Field of View (FOV) by the matrix size. The FOV represents the physical area that is being imaged, while the matrix size indicates the number of pixels available in that area. Thus, to calculate the size of an individual pixel, the total area (FOV) is divided by the number of pixels (matrix size). This calculation provides the dimensions of a single pixel, which is essential in understanding spatial resolution in radiographic images. By knowing pixel size, radiologists can make informed decisions about image quality and diagnostic capabilities.