Vision Rt Limited

Other

Glaxo Group Limited

Norman Ronald Smith

Ivan Daniel Meir

Gideon Matthew Hale

Martin Allen

Robert Howe

Kathryn Cooper

Anthony Ruto

Peter Geoffrey Lawton

Robert Edward Howe

Richard I Kitney

Stephen J Douglas

Colin R Heppenstall

Dana M Dawson

Umar M Baharom

Anthony Christopher Ruto

Antony Christopher Ruto

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

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.

The disclosed calibration method includes a calibration phantom positioned on an adjustable table on the surface of a mechanical couch, with the phantom's center at an estimated location for the iso-center 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-center 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 center of the calibration phantom and the iso-center 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-center of the apparatus.

Images obtained by a camera system () arranged to obtain stereoscopic 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 ().

Some embodiments are directed to a calibration method including a calibration phantom positioned on an adjustable table on the surface of a mechanical couch, with the phantom's center at an estimated location for the iso-center 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-center of the apparatus is determined by analyzing images of the irradiation. The calibration phantom is then repositioned by the mechanical couch applying an offset corresponding to the determined relative location of the center of the calibration phantom and the iso-center of the apparatus to the calibration phantom. Images of the relocated calibration phantom are obtained, and the images are processed to set the co-ordinate system of a 3D camera system relative to the iso-center of the apparatus.

A head positioning device for use in radio therapy is described for positioning a patient's head. The head positioning device comprises a head plate for supporting a patient's head; a base plate for connection to a mechanical couch; and a head plate adjustment assembly connecting the head plate to the base plate wherein the head plate adjustment assembly is arranged to vary the relative pitch, yaw and roll of the head plate relative to the base plate. The head positioning device is arranged to be attached to a mechanical couch with the head plate and the head plate adjustment assembly cantilevered off the end of the couch and the head plate adjustment assembly suspended beneath the head plate and the base plate.

Growing community of inventors

London, United Kingdom

Norman Ronald Smith