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16 February 2025 |
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Article overview
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Relationship between mass density, electron density, and elemental composition of body tissues for Monte Carlo simulation in radiation treatment planning | Nobuyuki Kanematsu
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2 Aug 2015 | Abstract: | Purpose: For Monte Carlo simulation of radiotherapy, x-ray CT number of every
system needs to be calibrated and converted to mass density and elemental
composition. This study aims to formulate material properties of body tissues
for practical two-step conversion from CT number. Methods: We used the latest
compilation on body tissues that constitute reference adult male and female. We
formulated the relations among mass, electron, and elemental densities into
polylines to connect representative tissues, for which we took mass-weighted
mean for the tissues in limited density regions. We compared the polyline
functions of mass density with a bi-line for electron density and broken lines
for elemental densities, which were derived from preceding studies. Results:
There was generally high correlation between mass density and the other
densities except of C, N, and O for light spongiosa tissues occupying 1% of
body mass. The polylines fitted to the dominant tissues and were generally
consistent with the bi-line and the broken lines. Conclusions: We have
formulated the invariant relations between mass and electron densities and from
mass to elemental densities for body tissues. The formulation enables Monte
Carlo simulation in treatment planning practice without additional burden with
CT-number calibration. | Source: | arXiv, 1508.0226 | Services: | Forum | Review | PDF | Favorites |
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