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Contrast enhancement of EPID images via difference imaging : a feasibility study

Kairn, Tanya, Khoei, Shadi, Markwell, Tim, Fielding, Andrew L., & Trapp, Jamie (2010) Contrast enhancement of EPID images via difference imaging : a feasibility study. Physics in Medicine and Biology, 55(22), N533-N545.

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Abstract

In this study, the feasibility of difference imaging for improving the contrast of electronic portal imaging device (EPID) images is investigated. The difference imaging technique consists of the acquisition of two EPID images (with and without the placement of an additional layer of attenuating medium on the surface of the EPID)and the subtraction of one of these images from the other. The resulting difference image shows improved contrast, compared to a standard EPID image, since it is generated by lower-energy photons. Results of this study show that, ¯rstly, this method can produce images exhibiting greater contrast than is seen in standard megavoltage EPID images and that, secondly, the optimal thickness of attenuating material for producing a maximum contrast enhancement may vary with phantom thickness and composition. Further studies of the possibilities and limitations of the di®erence imaging technique, and the physics behind it, are therefore recommended.

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ID Code: 37799
Item Type: Journal Article
Keywords: EPID, Electronic Portal Imaging, Radiotherapy, Contrast, Image quality, Difference imaging, Image subtraction
DOI: 10.1088/0031-9155/55/22/N02
ISSN: 1361-6560
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OTHER PHYSICAL SCIENCES (029900) > Medical Physics (029903)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Past > Schools > Physics
Copyright Owner: Copyright 2010 Institute of Physics
Deposited On: 08 Oct 2010 09:57
Last Modified: 01 Mar 2012 00:28

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