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Journal Articles Cancer/Radiothérapie Year : 2008

A phantom study of the accuracy of CT, MR and PET image registrations with a block matching-based algorithm

Abstract

PURPOSE: The aim of the present study was to quantitatively assess the performance of a block matching-based automatic registration algorithm integrated within the commercial treatment planning system designated ISOgray from Dosisoft. The accuracy of the process was evaluated by a phantom study on computed tomography (CT), magnetic resonance (MR) and positron emission tomography (PET) images. MATERIALS AND METHODS: Two phantoms were used to carry out this study: the cylindrical Jaszczak phantom and the anthropomorphic Liqui-Phil Head Phantom (the Phantom Laboratory), containing fillable spheres. External fiducial markers were used to quantify the accuracy of 41 CT/CT, MR/CT and PET/CT automatic registrations with images of the rotated and tilted phantoms. RESULTS: The study first showed that a cylindrical phantom was not adapted for the evaluation of the performance of a block matching-based registration software. Secondly, the Liqui-Phil Head Phantom study showed that the algorithm was able to perform automatic registrations of CT/CT and MR/CT images with differences of up to 40 degrees in phantom rotation and of up to 20-30 degrees for PET/CT with accuracy below the image voxel size. CONCLUSION: The study showed that the block matching-based automatic registration software under investigation was robust, reliable and yielded very satisfactory results. This phantom-based test can be integrated into a periodical quality assurance process and used for any commissioning of image registration software for radiation therapy.

Dates and versions

inria-00616066 , version 1 (19-08-2011)

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Cite

Aurélie Isambert, Guillaume Bonniaud, F. Lavielle, Grégoire Malandain, Dimitri Lefkopoulos. A phantom study of the accuracy of CT, MR and PET image registrations with a block matching-based algorithm. Cancer/Radiothérapie, 2008, 12 (8), pp.800-8. ⟨10.1016/j.canrad.2008.04.009⟩. ⟨inria-00616066⟩
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