3D stereoscopic camera monitoring system and method of calibrating a camera monitoring system for monitoring a patient in a bore of a medical system for radiation treatment

A camera monitoring system for a bore based medical apparatus having at least one of an imaging apparatus configured to record diagnostic images of a patient and a treatment apparatus integrated into the bore based medical apparatus, the camera monitoring system comprising:

• one or more 3D cameras, each comprising:
• a first image sensor and a second image sensor mounted on a circuit board, wherein the first and second image sensors are mounted on opposing surfaces of the circuit board, the circuit board is contained within a housing which also contains a first mirror and a second mirror positioned within the housing wherein the first image sensor is presented with a first view of an object to be imaged via the first mirror and second image sensor is presented with a second view of an object to be imaged via the second mirror, and
• wherein the camera furthermore, comprises a projector configured to project light on the surface of an object to be imaged by the first and second image sensors,
• a first lens arrangement positioned between the first image sensor and the first mirror, wherein the first image sensor is presented with a first view of an object to be imaged via the first lens arrangement and the first mirror, and
• a second lens arrangement positioned between the second image sensor and the second mirror, wherein the second image sensor is presented with a second view of an object to be imaged via the second lens arrangement and the second mirror;
• and
• a processor configured to process images obtained by the image sensors of the one or more 3D cameras and to generate a 3D model of the surface of an imaged object, and wherein at least one of the more or more 3D cameras is configured to be integrated or extend into a bore of the bore based medical apparatus, where a camera field of view covers an internal part of the bore of the medical apparatus.