When the x-ray source is positioned below the patient, where is the majority of scatter radiation directed?

When the x-ray source is positioned below the patient, such as during specific fluoroscopic procedures, most of the scatter radiation is directed toward the floor. This phenomenon occurs because the primary x-ray beam travels upwards through the patient and interacts with tissues, resulting in scatter radiation.

As the scatter is produced, it radiates in various directions; however, due to the geometry of the setup, much of this scatter will be directed downward. This is critical to understanding radiation safety and protection protocols, as personnel standing in the vicinity must be aware that they can be exposed to scatter that is primarily directed toward the floor. Consequently, protective measures must be taken to shield against this scatter, especially for those operating the equipment or assisting with the procedure.

The awareness of scatter radiation directionality helps inform the design of protective barriers and safety protocols to minimize exposure during fluoroscopic imaging.