The SSD in mobile fluoroscopy must be at least how many centimeters?

The SSD in mobile fluoroscopy must be at least how many centimeters?

• A. 28 centimeters
• B. 30 centimeters
• C. 38 centimeters
• D. 1 meter

Answer: (B)

The minimum Source-to-Skin Distance for mobile fluoroscopy is 30 cm. This requirement helps keep the skin dose within safe limits, since the dose rate drops with distance (inverse square law). When a mobile C-arm is used close to the patient, a 30 cm SSD ensures the tube isn’t too close to the skin, balancing image quality with safety. The other options don’t meet the standard minimum (28 cm is below the requirement), exceed the minimum without being the stated standard (38 cm), or are unnecessarily large (1 meter) for this context.

The minimum Source-to-Skin Distance for mobile fluoroscopy is 30 cm. This requirement helps keep the skin dose within safe limits, since the dose rate drops with distance (inverse square law). When a mobile C-arm is used close to the patient, a 30 cm SSD ensures the tube isn’t too close to the skin, balancing image quality with safety. The other options don’t meet the standard minimum (28 cm is below the requirement), exceed the minimum without being the stated standard (38 cm), or are unnecessarily large (1 meter) for this context.