What is the recommended cassette size for an AP/PA coccyx projection?

The recommended cassette size for an anteroposterior (AP) or posteroanterior (PA) coccyx projection is 8" x 10". This size is ideal for focusing on the coccyx while minimizing unnecessary exposure of surrounding tissues. The smaller cassette provides a more concentrated field of view, which is particularly important for films that require careful positioning and detail in small body areas such as the coccyx.

Using a size like 8" x 10" allows for adequate image receptor coverage while maintaining optimal detail and sharpness in the region of interest. Additionally, this size is well-suited for patient comfort and efficient use of film or digital imaging resources. Larger sizes such as 10" x 12" or 14" x 17" could lead to unnecessary radiation exposure and may result in less focused images of the coccyx, making them less ideal for this particular projection. The 5" x 7" size may be too small to capture sufficient detail and anatomy for accurate diagnostic interpretation in this context.