Patent ID: 9468416
Filing Date: 2016-10-18
CPC Classification: A61B,A61N,G09B

Claim Text:
1. A quality-control jig for use with an image-guided radiotherapy apparatus, comprising: a. an elongated stylus having a proximal end and a distal end; b. a three-axis positioner operatively secured to the proximal end of the stylus; c. a first ball bearing having a center; d. a first ball bearing cap secured to the ball bearing and adapted to fit over the distal end of the stylus to detachably mount the first ball bearing thereto; e. a pointer having a distal tip; f. a pointer cap secured to the pointer and adapted to fit over the distal end of the stylus to detachably mount the pointer thereto, the first ball bearing, the first ball bearing cap, the pointer, and the pointer cap being dimensioned such that when the pointer cap is mounted to the distal end of the stylus, the distal tip of the pointer has the same location as does the center of the first ball bearing when the first ball bearing cap is mounted to the distal end of the stylus; g. a flat plate; and means for fixing the plate to the stylus in such a manner that the pointer will cast a shadow on the plate when light is directed onto the pointer.