MULTI-RADIATION SOURCE X-RAY CT APPARATUS

摘要

A multi-radiation source X-ray CT apparatus comprises a sensor array consisting of sensors arranged fixedly, a vacuum chamber arranged fixedly, a nd an X-ray generating unit provided inside the vacuum chamber. The X-ray generating unit comprises a cathode so arranged fixedly in the vacuum chambe r in such a way as to surround the sensor array to emit an electron beam, an anode arranged fixedly in the vacuum chamber in such a way as to surround th e sensor array to emit X rays upon reception of the electron beams, a gate arr ay consisting of grid electrodes which are densely arranged fixedly between the cathode and the anode and having holes to allow the passage of the electron beams, a power source for impressing a bias voltage to the grid electrodes o f the gate arrays, and a control means for selecting a grid electrode suitable for imaging out of the gate array depending on an imaging part of subject, a nd for controlling the power feed from the power source so as to cancel the bia s voltage impressed on the selected grid electrode.