What is the maximum collimation size for the AP/PA sacrum projection?

The maximum collimation size for the AP/PA sacrum projection is 9" x 11". This specific measurement is important in radiography as it helps to limit the area of radiation exposure to the patient while ensuring that the necessary anatomy is included in the image.

Valid collimation is essential for both patient safety and image quality. By using the appropriate collimation size for this projection, radiographers can focus on the area of interest, in this case, the sacrum, while minimizing the exposure to surrounding tissues.

Larger collimation sizes would be unnecessary for the AP/PA sacrum projection, as they could increase the patient exposure without contributing to diagnostic information, meaning the narrower dimensions effectively meet clinical needs while adhering to the principles of radiation protection. Thus, the 9" x 11" collimation size is both recommended and practical for this specific radiographic view.