Patient set-up in radiotherapy

PID/DRR data fusion for patient set-up in radiotherapy

External radiotherapy requires repositioning each day the patient relatively to the radiation machine. We have developed a method based registration of data acquired on the treatment machine (high intensity X-ray PID images) to data corresponding to the ideal set-up computed from the CT scan (DRR radiograph simulation). Because automatic processing of PID images is very difficult, we have developed a voxel-based method avoiding segmentation. Differents similarity measures and optimization algorithms have been evaluated. 2D/2D and 3D/3D registration have been tested.


- LeVerre C., Troccaz J., Artignan X., Bolla M. Intensity-based registration of portal images for patient positioning in radiotherapy. In Proceedings of Surgetica’2005, Troccaz J., Merloz P. (Eds), Sauramps Medical, 2005, pp429-436 (PDF)

- Le Verre C. Méthodes de recalage par function de similarité. Application au repositionnement de patients en radiothérapie. Ph.D. Thesis (in french), ED ISCE (MIMB), UJF, 2004

Collaborations: Grenoble University Hospital (Pr Bolla, Dr Artignan – Radiotherapy Dept.)

Status: Pre-clinical evaluation of the 2D/2D method; experimental work on patients data as regards 2D/3D; one PhD thesis defended in 2004


Laboratoire TIMC-IMAG, Domaine de la Merci, 38706 La Tronche Cedex

Grenoble INP
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