Test object for quality control apparatus radiotherapy treatment and methods of manufacture and use of said test object

摘要

The object has a spherical ball (9) placed at center of filled sphere (8) to form a test-object. The ball and the sphere have diameters respectively ranging between 5 and 6 mm, and 80 and 200 mm and formed from materials with electronic densities whose ratio is greater than or equal to 1.1. The sphere carries a visual alignment unit formed by visible equatorial lines, orthogonal in pairs, on outer surface to allow positioning of the object. The sphere has thread securing positioning units formed of a metal rod (13) and a plate (14) of the object on radiotherapy treatment apparatus. Independent claims are also included for the following: (1) a method for manufacturing a test-object (2) a method for verifying coincidence, orthogonality and position in a space of treatment room of marking unit of isocenter of radiotherapy treatment apparatus (3) a method for searching isocenter of radiotheraphy treatment apparatus by using test object.