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Erschienen in: Journal of Digital Imaging 6/2011

01.12.2011

DRR and Portal Image Registration for Automatic Patient Positioning in Radiotherapy Treatment

verfasst von: Ma Consuelo Bastida-Jumilla, Jorge Larrey-Ruiz, Rafael Verdú-Monedero, Juan Morales-Sánchez, José-Luis Sancho-Gómez

Erschienen in: Journal of Imaging Informatics in Medicine | Ausgabe 6/2011

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Abstract

Image processing turns out to be essential in the planning and verification of radiotherapy treatments. Before applying a radiotherapy treatment, a dosimetry planning must be performed. Usually, the planning is done by means of an X-ray volumetric analysis using computerized tomography, where the area to be radiated is marked out. During the treatment phase, it is necessary to place the patient under the particle accelerator exactly as considered in the dosimetry stage. Coarse alignment is achieved using fiduciary markers placed over the patient’s skin as external references. Later, fine alignment is provided by comparing a digitally reconstructed radiography (DRR) from the planning stage and a portal image captured by the accelerator in the treatment stage. The preprocessing of DRR and portal images, as well as the minimization of the non-shared information between both kinds of images, is mandatory for the correct operation of the image registration algorithm. With this purpose, mathematical morphology and image processing techniques have been used. The present work describes a fully automatic method to calculate more accurately the necessary displacement of the couch to place the patient exactly at the planned position. The proposed method to achieve the correct positioning of the patient is based on advanced image registration techniques. Preliminary results show a perfect match with the displacement estimated by the physician.
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Metadaten
Titel
DRR and Portal Image Registration for Automatic Patient Positioning in Radiotherapy Treatment
verfasst von
Ma Consuelo Bastida-Jumilla
Jorge Larrey-Ruiz
Rafael Verdú-Monedero
Juan Morales-Sánchez
José-Luis Sancho-Gómez
Publikationsdatum
01.12.2011
Verlag
Springer-Verlag
Erschienen in
Journal of Imaging Informatics in Medicine / Ausgabe 6/2011
Print ISSN: 2948-2925
Elektronische ISSN: 2948-2933
DOI
https://doi.org/10.1007/s10278-011-9376-z

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