Correction of megavoltage cone-beam CT images for dose calculation in the head and neck region.

Correction of megavoltage cone-beam CT images for dose calculation in the head and neck region. Research Abstract Details 

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Correction of megavoltage cone-beam CT images for dose calculation in the head and neck region. Abstract Text:

Megavoltage cone-beam computed tomography (MVCBCT) imaging systems are now available for image-guided radiation therapy delivery and verification. In order to use the three-dimensional anatomical information for dose calculation, the MVCBCT image must provide accurate electron density. This work proposes a new method that has been developed to correct for the cupping and missing data artifacts seen on MVCBCT images of the head and neck region. It uses a conventional kilovoltage CT (kVCT) image as a reference for electron density and rigid registration with a MVCBCT image to obtain correction factors. Dose calculations performed on MVCBCT images corrected with the proposed method agree with calculations done on kVCT images within +/- 1% on phantoms. With patients images the agreement is within +/- 13% above the shoulders and +/- 5% below the shoulder line. This level of dose calculation accuracy allows the use of MVCBCT images for dose verification purposes.

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Correction of megavoltage cone-beam CT images for dose calculation in the head and neck region. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Medical physics

VOLUME: 35

Page Numbers: 900-7

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ISSN: 0094-2405

DAY: 14

MONTH: Mar

YEAR: 2008

Correction of megavoltage cone-beam CT images for dose calculation in the head and neck region. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Correction of megavoltage cone-beam CT images for dose calculation in the head and neck region.

AFFILIATION: Department of Radiation Oncology, University of California San Francisco, 1600 Divisadero Street, Suite H1031, San Francisco, California 94143, USA. ambryjt@rodone.usef.edu

Country: United States

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MEDLINETA: Med Phys

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