| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus not requiring means for notifying that the apparatus is in a dangerous state where a rotary body is not under control, and improving workability of maintenance.SOLUTION: The X-ray CT apparatus includes a gantry, a rotary body, a wheel gear, a worm and a movement mechanism. The rotary body is set on the gantry so as to rotate around the body axis of a subject, and mounted with a unit for X-ray photography. The wheel gear has a tooth part continuously set to the outer periphery of the rotary body along its circumferential direction. The worm rotates the rotary body via the wheel gear by rotating while engaged with the wheel gear. The movement mechanism moves the worm to a maintenance position where the worm is restricted only in rotation via the wheel gear by engaging the worm with the wheel gear in maintenance time, or to an X-ray photography position where the restriction is cancelled by separating the worm from the gear wheel so that the rotary body is rotatable.</p> |
