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Proceedings Paper

Improvements in medical CT image reconstruction accuracy in the presence of metal objects by using x-rays up to 1 MeV
Author(s): James Clayton; Gary Virshup; Ming Yang; Radhe Mohan; Lei Dong
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Paper Abstract

The use of flat panels based on amorphous silicon technology (a-Si) for digital radiography has been accepted by the medical community as having advantages over film-based systems. Radiation treatment planning employs computed tomographic (CT) data sets and projection images to delineate tumor targets and normal structures that are to be spared from radiation treatment. The accuracy of CT numbers is crucial for radiotherapy dose calculations in general but is even more important for charged particle therapy. Conventional CT scanners operating at kilovoltage X-ray energies typically exhibit significant image reconstruction artifacts in the presence of metal implants in human body. We demonstrate a significant improvement in metal artifact reductions and electron density measurements using an amorphous silicon a-Si imager obtained with an X-ray source that can operate at energies up to 1 MeV. The data collected with the higher energy system will be compared and contrasted to CT results obtained at standard kilovoltage energies.

Paper Details

Date Published: 8 April 2009
PDF: 11 pages
Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 72951P (8 April 2009); doi: 10.1117/12.817401
Show Author Affiliations
James Clayton, Varian Medical Systems (United States)
Gary Virshup, Varian Medical Systems (United States)
Ming Yang, M.D. Anderson Cancer Ctr. (United States)
Radhe Mohan, M.D. Anderson Cancer Ctr. (United States)
Lei Dong, M.D. Anderson Cancer Ctr. of Houston (United States)

Published in SPIE Proceedings Vol. 7295:
Health Monitoring of Structural and Biological Systems 2009
Tribikram Kundu, Editor(s)

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