Ace Radiology Physics 2025 – Radiate Confidence and Test Your Skills!

The minimum source to skin distance (SSD) for fixed fluoroscopy units is set at 15 inches. This regulation is essential in minimizing radiation exposure to patients during fluoroscopic procedures. By maintaining a sufficient distance from the X-ray source to the skin, the intensity of radiation that reaches the patient is significantly reduced, following the inverse square law of radiation. This law states that as the distance from the source increases, the radiation dose decreases.

In clinical practice, the 15-inch minimum is a standard established to balance effective imaging quality with necessary safety measures. This standard helps protect patients from excessive radiation exposure, which can have detrimental effects on tissue and overall health. Furthermore, fixed fluoroscopy units are prevalent in numerous medical settings, making adherence to these guidelines crucial for patient safety.

Other distances provided in the options do not meet regulatory standards for fixed fluoroscopy and would not adequately protect patients from radiation exposure.