16列MDCTにてStereotactic Body Frameを撮影した場合のアーチファクトとその対策(臨床技術)
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概要
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We found an artifact of the Stereotactic Body Frame's (SBF) indicators when we used diagnostic 16-row multi-detector computed tomography (MDCT) as a simulator. Stereotactic radiotherapy (SRT) requires the accuracy of each millimeter. However, a gap of 3mm at the maximum along the Z axis was caused by this artifact. We assessed the characteristics and cause of this artifact and searched for an imaging parameter to reduce the artifact in SRT. It was considered that the artifact was formed mainly by a stair-step artifact and cone-beam artifact. We can acquired accuracy, 1mm minimizing the beam width and pitch (10mm/0.5625). However, exposure time was extended because minimum pitch was selected. The influence on dose calculation was negligible. We decided to use a default parameter for treatment planning, and this parameter for determining the isocenter. We found the MDCT parameters to get acceptable positional accuracy for SRT with SBF.
- 公益社団法人日本放射線技術学会の論文
- 2006-08-20
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- 16列MDCTにてStereotactic Body Frameを撮影した場合のアーチファクトとその対策(臨床技術)