Patent Document ID: 20160129283
Application ID: 14899112
Patent Status: 0

Claim One:
1. A method of calibrating a stereoscopic camera system for use with a radio therapy treatment apparatus, the method comprising: positioning a calibration phantom with the phantom's centre at an estimated location for the iso-centre of a radio therapy treatment apparatus; irradiating the calibration phantom using the radio therapy treatment apparatus and determining the relative location of the centre of the calibration phantom and the iso-centre of the radio therapy treatment apparatus by analysing images of the irradiation of the calibration phantom; applying an offset corresponding to the determined relative location of the centre of the calibration phantom and the iso-centre of the radio therapy treatment apparatus to the calibration phantom; utilising a stereoscopic camera system to obtain images of the relocated calibration phantom to which the offset has been applied; and processing the obtained images to set the co-ordinate system of the stereoscopic camera system relative to the iso-centre of the radio therapy treatment apparatus.