Within a digital radiography image matrix, 1024 x 1024 refers to the:

• A. Size of pixels in the matrix
• B. Number of brightness level displayed in the matrix
• C. Physical measurement of the matrix
• D. Number of pixels in the matrix

Answer: (D)

In digital radiography, the image matrix defines how many picture elements are used to form the image. The two numbers show how many pixels exist across the width and down the height. So a 1024 x 1024 matrix means there are 1024 pixels along each dimension, totaling 1,048,576 pixels for the whole image. This reflects the resolution capability: more pixels generally allow finer detail, assuming the field of view is set accordingly. The actual pixel size depends on both the field of view and the matrix size, since pixel size equals the field of view divided by the number of pixels across. This isn’t about brightness levels (that’s determined by bit depth) or a physical measurement of the matrix; it specifically describes how many pixels make up the image.