By applying robust aluminum alloy casting to each component of the equipment, any distortion and any torsion is prevented and enhanced performance is secured during whole ARM rotation. In addition, by applying unique and high level technology on sides of X-ray Tube Head of ARM Assembly and FPD(Flat Panel Detector), wobbling of rotation shaft(precession movement) is prevented. ?Precession Movement is a phenomenon that the axis of a rotating object deflects as it draws a circle. ?Rotation might be 270°according to condition of patient positioning. quality2 Compact design easy to introduce Alioth Series is a compact CT equipment of which size is the same as conventional panoramic radiograph. The necessary installation space for Alioth is W1480 x D1480 x H2300 (mm) and the equipment weight is 280 kg, which is about the half (1/2) of our conventional CT models. A compact design which does not require any large scale modification of existing X-ray room is realized.