
Proceedings Paper
Linearity between CT number and iodine concentration and application to improving accuracy of CT number in slow kV-switching dual energy CTFormat | Member Price | Non-Member Price |
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Paper Abstract
The linearity between CT numbers and iodine concentrations is proved analytically provided the correlations between
the atoms are negligible. This relationship is applied to correct the CT numbers in the ICA regions in monochromatic
images of dual energy CT with the slow kV-switching technique where one scan with a low/high tube voltage follows by
another scan with a high/low voltage. The iodine concentration may change significantly during the kV-switching. The
resultant CT numbers in ICA regions may not be meaningful in the monochromatic images from pre-reconstruction
decompositions because the data with the low/high voltages are not consistent. Using the linearity between CT numbers
and iodine concentrations, the CT numbers in ICA regions can be corrected by referring to the CT numbers in the
polychromatic images with the low/high voltages. A numerical simulation and a phantom study are performed to
examine the linearity between CT numbers and iodine concentrations. The CT number correction by use of the linearity
is tested in the numerical simulation study in slow kV-switching dual energy CT. The results show that the corrected CT
numbers by use of the linearity are accurate.
Paper Details
Date Published: 13 March 2009
PDF: 8 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72583Z (13 March 2009); doi: 10.1117/12.811709
Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)
PDF: 8 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72583Z (13 March 2009); doi: 10.1117/12.811709
Show Author Affiliations
Yu Zou, Toshiba Medical Research Institute USA (United States)
Michael D. Silver, Toshiba Medical Research Institute USA (United States)
Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)
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