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An electron density calibration phantom for CT‐based treatment planning computers
Author(s) -
Constantinou Chris,
Harrington James C.,
DeWerd Larry A.
Publication year - 1992
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.596862
Subject(s) - hounsfield scale , imaging phantom , voxel , calibration , scanner , radiation treatment planning , computation , nuclear medicine , computer science , medical physics , computed tomography , algorithm , mathematics , physics , artificial intelligence , medicine , radiology , statistics , radiation therapy
In order to correct for tissue heterogeneities on a voxel‐by‐voxel basis during CT‐based treatment planning, the relationship between the correction factor (CF) and the CT number in Hounsfield units (HU) for the scanner in use must be established. Since the relationship between CF and electron density (ρ e ) of various materials is well documented, the ρ e vs HU is required for direct computation of the correction factors by treatment planning computers. A CT phantom with 18 different tissue substitutes has been used to establish the ρ e vs HU relationship. A description of the phantom and its contents is given and the calibration of the CT function of the planning computer is discussed.