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

Title:

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

Document Type and Number:

WIPO Patent Application WO/2015/008040

Kind Code:

A3

Abstract:

A method of calibration of a stereoscopic camera system (10,12) for use with a radio therapy treatment apparatus (14) is provided. Initially a calibration phantom (18) is positioned on an adjustable table (20) on the surface of a mechanical couch (16) with the phantom's centre at an estimated location for the iso-centre of a radio therapy treatment apparatus (14). The calibration phantom (18) is then irradiated using the radio therapy treatment apparatus (14) and the relative location of the centre of the calibration phantom and the iso-centre of the radio therapy treatment is determined by analysing images of the irradiation of the calibration phantom (18). The calibration phantom (18) is then repositioned by the mechanical couch (16) 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 (14) to the calibration phantom (18). The stereoscopic camera system (10,12) then proceeds to obtain images of the relocated calibration phantom (18) to which the offset has been applied and processes the obtained images to set the co-ordinate system of the stereoscopic camera system (10,12) relative to the iso-centre of the radio therapy treatment apparatus (14).

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Inventors:

MEIR IVAN (GB)
ALLEN MARTIN (GB)
HALE GIDEON (GB)
SMITH NORMAN (GB)
HOWE ROBERT (GB)

Application Number:

PCT/GB2014/052125

Publication Date:

May 21, 2015

Filing Date:

July 11, 2014

Export Citation:

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Assignee:

VISION RT LTD (GB)

International Classes:

A61N5/10; A61B6/00; G06T7/00

Foreign References:

US7889906B2	2011-02-15
EP1380262A1	2004-01-14

Other References:

TIDEMAN ARP DENNIS ET AL: "x-ray and beam isocenters-What's the dif", MEDICAL PHYSICS, AIP, MELVILLE, NY, US, vol. 39, no. 3, 1 March 2012 (2012-03-01), pages 1418 - 1423, XP012160894, ISSN: 0094-2405, [retrieved on 20120223], DOI: 10.1118/1.3685581