Final answer:
For a radiographic image of the contrast-filled urinary bladder with the patient in the supine position, an AP projection with the CR perpendicular to the film and centered at the pubic symphysis is recommended.
Step-by-step explanation:
The question pertains to the recommended Central Ray (CR) position for a radiographic imaging of a contrast-filled urinary bladder when the patient is in a supine position. For this procedure, an AP (anterior-posterior) projection is generally recommended.
The CR should be perpendicular to the film, entering the midline of the body at the level of the pubic symphysis. This ensures that the urinary bladder is captured squarely in the image for effective diagnosis and treatment planning. Proper collimation and centering are essential to obtain the best radiographic results while reducing patient exposure to radiation.