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CT reconstruction from portal images acquired during volumetric-modulated arc therapy.

Poludniowski, G, Thomas, MD, Evans, PM and Webb, S (2010) CT reconstruction from portal images acquired during volumetric-modulated arc therapy. Phys Med Biol, 55 (19). pp. 5635-5651.

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Volumetric-modulated arc therapy (VMAT), a form of intensity-modulated arc therapy (IMAT), has become a topic of research and clinical activity in recent years. As a form of arc therapy, portal images acquired during the treatment fraction form a (partial) Radon transform of the patient. We show that these portal images, when used in a modified global cone-beam filtered backprojection (FBP) algorithm, allow a surprisingly recognizable CT-volume to be reconstructed. The possibility of distinguishing anatomy in such VMAT-CT reconstructions suggests that this could prove to be a valuable treatment position-verification tool. Further, some potential for local-tomography techniques to improve image quality is shown.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Vision Speech and Signal Processing
Authors :
Poludniowski, G
Thomas, MD
Evans, PM
Webb, S
Date : 7 October 2010
DOI : 10.1088/0031-9155/55/19/002
Uncontrolled Keywords : Esophageal Neoplasms, Humans, Image Processing, Computer-Assisted, Radiotherapy, Computer-Assisted, Radiotherapy, Intensity-Modulated, Tomography, X-Ray Computed
Additional Information : Copyright 2010 Institute of Physics. This is the author's accepted manuscript.
Depositing User : Symplectic Elements
Date Deposited : 05 Feb 2013 11:21
Last Modified : 31 Oct 2017 14:52

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