In digital imaging, as the size of the image matrix increases?

In digital imaging, as the size of the image matrix increases, the pixel size decreases, which in turn enhances spatial resolution. Increasing the size of the image matrix means there are more pixels available to represent the same area of the image. As each pixel represents a smaller portion of the overall image, this leads to improved detail and clarity, known as higher spatial resolution.

Although an increase in image matrix size typically corresponds with a larger field of view (FOV) depending on the imaging system and how it is set up for capturing images, the direct relationship that strengthens in this specific question is between the matrix size and the pixel size. A smaller pixel size contributes to greater spatial resolution because each pixel can capture finer details.

While it is true that an increase in matrix size can affect both FOV and pixel size, it's the direct decrease in pixel size, resulting from the increase in matrix size, that primarily governs the increase in spatial resolution, making this aspect the most pertinent in response to the question.