Within a digital radiography matrix, what does 1024 x 1024 refer to in imaging terms?

• A. The number of pixels in the matrix
• B. The size of pixels in the matrix
• C. The number of brightness levels displayed in the matrix
• D. The physical measurement of the matrix

Answer: (A)

In a digital radiography matrix, 1024 x 1024 refers to the grid size—the number of sampling points in each dimension. It means there are 1024 pixels across and 1024 pixels down, for a total of 1,048,576 pixels in the image. This tells you how finely the image is sampled, not how bright each pixel is or how large the pixels physically are. Pixel size (pitch) depends on the field of view and the matrix dimensions, while the number of brightness levels depends on the bit depth (how many gray shades the system can display). So this specification is about the count of pixels in the matrix, not brightness levels or physical dimensions.