Radiation therapy apparatus i.e. image guided radiation therapy apparatus, for irradiating tumor tissue of patient, has verification device arranged outside confinement device such that irradiation field is optically displayed on patient

摘要

The apparatus has an irradiation field confinement device comprising a multi-element collimator (MLC) for adjusting an irradiation field (BSF). A verification device visually verifies the irradiation field. The verification device is movably arranged outside the confinement device such that the irradiation field is optically displayed on a patient (P) depending on measurement data i.e. actual time data, where the patient is positioned at distance from an isocenter (IZ) of the apparatus. The verification device has a light-emitting system outputting a laser beam such as cross laser beam. An independent claim is also included for a method for verifying an irradiation field.