Primary radiation diaphragm

摘要

A primary radiation diaphragm for use in a medical radiation application apparatus for gating the x-ray beam emitted by a radiation source onto a desired region has first and second diaphragm plates and an actuator for the diaphragm plates having two ranges of adjustment. The first diaphragm plate is adjusted within the first range of adjustment by movement of the actuator, and the second diaphragm rate is adjusted by moving the actuator within the second range of adjustment.