Vision Rt Limited

Ivan Daniel Meir

Norman Ronald Smith

Gideon Matthew Hale

Martin Allen

Edward William Mead

Robert Howe

Kathryn Cooper

Anthony Ruto

Adrian Roger William Barrett

Todd Pawlicki

Michael James Tallhamer

James Mathew Hughes, Ii

Robert Edward Howe

James O Turner

James Mathew Hughes Ii

Anthony Christopher Ruto

Antony Christopher Ruto

A method of calibrating a monitoring system () is described in which a calibration phantom () is located with its center located approximately at the isocenter of a treatment room through which a treatment apparatus () is arranged to direct radiation, wherein the surface of the calibration phantom () closest to an image capture device () of the monitoring system () is inclined approximately 45° relative to the camera plane of an image capture device of the monitoring system. Images of the calibration phantom () are then captured using the image capture device () and the images are processed to generate a model of the imaged surface of the calibration phantom. The generated model of the imaged surface of the calibration phantom () is then utilized to identify the relative location of the center of the calibration phantom () and the camera plane of the image capture device () which is then utilized to determine the relative location of the camera plane of the image capture device and the isocenter of a treatment room.

Method of calibrating a patient monitoring system for use with a radiotherapy treatment apparatus

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.

Calibration of a stereoscopic camera system for use with a radio therapy treatment apparatus

Method of calibration of a stereoscopic camera system for use with a radio therapy treatment apparatus

Images obtained by a camera system () arranged to obtain images of a patient () undergoing radio-therapy are processed by a modeling unit () which generates a model of the surface of a patient () being monitored. Additionally the patient monitoring system processes image data not utilized to generate a model of the surface of a patient being monitored to determine further information concerning the treatment of the patient (). Such additional data can comprise data identifying the relative location of the patient and a treatment apparatus (). This can be facilitated by providing a number or retro-reflective markers (-) on a treatment apparatus () and a mechanical couch () used to position the patient () relative to the treatment apparatus () and monitoring the presence and location of the markers in the portions of the images obtained by the stereoscopic camera ().

Patient monitor

Some embodiments are directed to an image director of a patient monitoring system to obtain calibration images of a calibration sheet or other calibration object at various orientations and locations. The images are then stored and processed to calculate camera parameters defining the location and orientation of the image detector and identifying internal characteristics of the image detector, and the information are stored. The patient monitoring system can be re-calibrated by using the image detector to obtain an additional image of a calibration sheet or calibration object. The additional image and the stored camera parameters are then used to detect any apparent change in the internal characteristics of the image detector ()(S-).

A method of calibrating a monitoring system () is described in which a calibration phantom () is located with its center located approximately at the isocenter of a treatment room through which a treatment apparatus () is arranged to direct radiation, wherein the surface of the calibration phantom () closest to an image capture device () of the monitoring system () is inclined approximately 45&#xb0; relative to the camera plane of an image capture device of the monitoring system. Images of the calibration phantom () are then captured using the image capture device () and the images are processed to generate a model of the imaged surface of the calibration phantom. The generated model of the imaged surface of the calibration phantom () is then utilized to identify the relative location of the center of the calibration phantom () and the camera plane of the image capture device () which is then utilized to determine the relative location of the camera plane of the image capture device and the isocenter of a treatment room.

A patient monitor is disclosed for detecting patient movement or abnormal breathing. Images of a patient are obtained by a stereoscopic camera. These images are then processed by a 3D position determination module which determines measurements indicative of positions of at least part of a patient. The obtained measurements are then passed to a model generation module which generates a breathing model of the variation in position of the at least part of a patient during a breathing cycle. Subsequently abnormal breathing or patient movement can be detected by processing further images obtained by the stereoscopic camera to determine more measurements indicative of positions of at least part of a patient. These measurements are then compared with a stored breathing model by a comparison module. If abnormal breathing or patient movement is detected the comparison module sends a signal to a treatment apparatus to interrupt treatment until normal breathing resumes or alternatively to a mechanical couch to reposition the patient to account for the detected movement.

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London, United Kingdom

Ivan Daniel Meir