What is the function of a 'dead man' switch in fluoroscopy?

The function of a 'dead man' switch in fluoroscopy is to stop exposure when pressure is released. This safety mechanism is designed to minimize patient and operator radiation dose by ensuring that the exposure can only occur while the switch is actively pressed. If the operator becomes incapacitated or inadvertently lets go of the switch, the fluoroscopy equipment will immediately cease radiation exposure, thereby preventing unintended or prolonged exposure.

This feature is critical for maintaining a safe working environment in fluoroscopic procedures, as it provides a fail-safe against both accidental and continuous radiation delivery. By ensuring that the exposure is contingent upon the operator's deliberate action, the 'dead man' switch reinforces the principle of operator control in potentially hazardous situations.