Abstract
Purpose/Objective: The introduction of CT/LINAC combinations, where the CT scanner and LINAC share the same patient couch, and of kilovoltage cone-beam CT systems attached to the LINAC gantry, means that CT-guided localization of the prostate may soon become a clinical reality. The daily setup error achieved with these new systems will probably be dominated by the precision with which the prostate position in the daily CT images can be compared with its position in the treatment plan. The aim of this study was to investigate the intra- and inter-user variations that can be expected for a manual alignment technique similar to that used in a commercial ultrasound-based system (BAT, NOMOS Corp), where the user manually aligns GTV contours with the daily images.
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