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Geometry calibration for x-ray equipment in radiation treatment devices

: Selby, Peter; Sakas, Georgios; Walter, Stefan; Stilla, Uwe

Tavares, J.M.R.S. ; European Community on Computational Methods in Applied Science -ECCOMAS-:
Computational Vision and Medical Image Processing, VipIMAGE 2007 : 1st ECCOMAS Thematic Conference on Computational Vision and Medical Image Processing, held in Porto, Portugal, on 17-19 October 2007
London: Taylor & Francis, 2008
ISBN: 0-415-45777-7
ISBN: 978-0-415-45777-4
Thematic Conference on Computational Vision and Medical Image Processing (VipIMAGE) <1, 2007, Porto>
Fraunhofer IGD ()
radiology; x-ray; matching; calibration; oncology

It is essential for radiological tumor treatment to position a patient very accurate in the treatment device. To avoid sub-millimetre misalignments for a patient in the treatment facility, X-ray images acquired from within the device can be compared to the planning CT. But as slight displacements of the treatment beam nozzle, the digital X-ray panels and the X-ray tubes may arise over time and with movements of the dynamic parts of the treatment device, the underlying geometry model for the patient set-up correction may become inaccurate. To solve this problem, an automatic calibration routine is proposed, which bases on the known geometry of a calibration phantom and X-ray images acquired during the calibration routine. The result from the registration of the X-ray projections of the phantom and its known geometry is used to update the geometric model of the respective beamlines to enable accurate alignment correction.