Abstract
Relevance: This article examines the effect of the presence or absence of an ImAR filter on the calibration curve for converting X-ray tomography (CT) data to relative electron density (CT-to-ED) values for the abdominal region and head. On CT images this results in distortion of Hounsfield Units (HU) values. The latter, in turn, can lead to inaccuracies in the CT-to-ED calibration curve. Conclusions: If the filters are set up correctly and applied according to the planning system manufacturer's recommendations, changes in the CT-to-Ed curve should be negligible. CT-to-ED curves are an important tool for improving the accuracy and quality of radiation therapy for cancer
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