Patent ID: 8989846
Filing Date: 2015-03-24
Classification: A61B,A61N,Y10S

Abstract:
1. An image-guided radiation treatment (IGRT) apparatus, comprising: a gantry frame including a ring member, the ring member being rotatable around a substantially horizontal, longitudinally extending central axis, said ring member having first and second horizontally opposing ends; a radiation treatment head coupled to said ring member in an outwardly movable manner by an arm member extending outwardly from said first end of said ring member in a direction away from said second end, said outward movability being characterized in that said radiation treatment head is movable in at least a longitudinal direction toward and away from said first end of said ring member; and a spoke structure fixably mounted within the ring member and rotatable therewith around the central axis, wherein said arm member couples to said ring member at a shoulder joint that is translatably movable along said spoke structure, whereby a source-axis distance between the radiation treatment head and the central axis is dynamically variable by translation of said shoulder joint along said spoke structure.