For which distance is the minimum SSD set at 30 cm according to FDA regulations?

The minimum source-to-skin distance (SSD) of 30 cm as stipulated by FDA regulations specifically applies to standard double-sized mobile fluoroscopic devices. This requirement is crucial because it helps to minimize radiation exposure to patients by ensuring that the radiation is delivered from a safe distance, thus reducing the intensity of the radiation that reaches the skin.

Standard double-sized mobile fluoroscopic devices are often used in a variety of clinical settings, and establishing a minimum SSD for them helps standardize practices and protect patients during procedures. The regulations aim to ensure consistent safety measures across facilities that utilize these devices, as the risk of radiation exposure is a significant concern in medical imaging.

Other types of devices, such as handheld imaging devices and mobile and portable fluoroscopic devices, may have different guidelines regarding SSD due to their unique operational characteristics, making them not aligned with this particular regulation.