Question

Which CR orientation is recommended for a radiographic image of the contrast-filled urinary bladder with the patient in the supine position?

A. 2 inches inferior to the pubic symphysis with a 10 to 15 degree cephalad angle
B. 2 inches superior to the pubic symphysis with a 10 to 15 degree caudad angle
C. 1 inch proximal to the tip of the coccyx with a 10 to 15 degree cephalad angle
D. 1 inch distal to the tip of the coccyx with a 10 to 15 degree caudad angle

Answer 1

The correct Central Ray orientation for a radiograph of the contrast-filled urinary bladder in the supine position is 2 inches inferior to the pubic symphysis with a 10 to 15 degree cephalad angle.

Step-by-step explanation:

The recommended Central Ray (CR) orientation for a radiographic image of a contrast-filled urinary bladder with the patient in the supine position is option A, which is 2 inches inferior to the pubic symphysis with a 10 to 15 degree cephalad angle. This particular CR orientation is chosen to ensure the x-ray beam is properly aligned with the bladder, considering the anatomy of the pelvis and the position of the bladder within the true pelvis or lesser pelvic cavity. To achieve the best radiographic image, it is vital to consider the pelvic brim and pelvic outlet, as well as the angle of the pelvis which tilts anteriorly.