PORTAL IMAGING DEVICE

摘要

A surface mountable apparatus is provided for positioning an imaging device (3) relative to the gantry (1) of a radiation therapy apparatus. The apparat us comprises a mounting device (11) for mounting the apparatus on the gantry surface a telescopically extendable arm (13, 14) which is pivotally connecte d to the mounting device (11) and a holder (17) for holding an imaging device (3) the holder (17) being connected to the distal portion (14) of the telescopically extendable arm. The apparatus is mechanically simple and relatively inexpensive to manufacture. The apparatus when assembled to a radiation therapy apparatus provides an accurate and lightweight means of positioning and stowing an imaging device.