METHOD OF CALIBRATION OF A STEREOSCOPIC CAMERA SYSTEM FOR USE WITH A RADIO THERAPY TREATMENT APPARATUS

摘要

The disclosed calibration method includes a calibration phantom positioned on an adjustable table on the surface of a mechanical couch, with the phantom's centre at an estimated location for the iso-centre of a radio therapy treatment apparatus. The calibration phantom is then irradiated using the apparatus, and the relative location of the center of the calibration phantom and the iso-centre of the apparatus is determined by analyzing images of the irradiation of the calibration phantom. The calibration phantom is then repositioned by the mechanical couch applying an offset corresponding to the determined relative location of the centre of the calibration phantom and the iso-centre of the apparatus to the calibration phantom. Images of the relocated calibration phantom are obtained, to which the offset has been applied, and the obtained images are processed to set the co-ordinate system of a stereoscopic camera system relative to the iso-centre of the apparatus.

主权项

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.