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Accounting for beta-particle energy loss to cortical bone via paired-image radiation transport (PIRT)
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10.1118/1.1898463
/content/aapm/journal/medphys/32/5/10.1118/1.1898463
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/32/5/10.1118/1.1898463

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the PIRT model constructed for the pelvis. Regions of spongiosa (interior) and cortical bone (exterior) are shown in the CT macroimage (upper right).

Image of FIG. 2.
FIG. 2.

Schematic of the PIRT model constructed for the cranium. Segmented regions of spongiosa are shown for the frontal, right parietal, left parietal, and occipital bones of the cranial cap.

Image of FIG. 3.
FIG. 3.

Schematic of the PIRT model constructed for the ribs.

Image of FIG. 4.
FIG. 4.

Electron absorbed fractions to active bone marrow within the pelvis for three source tissues—TAM, TBV, and TBS. Data shown by solid lines are from the PIRT model, while those given by dashed lines are from VBIST simulations. Two marrow cellularities are assumed: (a) 100% active marrow and (b) the ICRP reference cellularity of 48%.

Image of FIG. 5.
FIG. 5.

Electron absorbed fractions to active bone marrow within the cranium for three source tissues—TAM, TBV, and TBS. Data shown by solid lines are from the PIRT model, while those given by dashed lines are from VBIST simulations. Two marrow cellularities are assumed: (a) 100% active marrow and (b) the ICRP reference cellularity of 38%.

Image of FIG. 6.
FIG. 6.

Electron absorbed fractions to active bone marrow within the ribs for three source tissues—TAM, TBV, and TBS. Data shown by solid lines are from the PIRT model, while those given by dashed lines are from VBIST simulations. Two marrow cellularities are assumed: (a) 100% active marrow and (b) the ICRP reference cellularity of 70%.

Image of FIG. 7.
FIG. 7.

Electron absorbed fractions to the trabecular bone endosteum within (a) the pelvis, (b) the cranium, and (c) the ribs for three source tissues—TAM, TBV, and TBS. Data shown by solid lines are from the PIRT model, while those given by dashed lines are from VBIST simulations.

Tables

Generic image for table
TABLE I.

Tissue compositions (% by mass) and mass densities used in both the VBIST and PIRT models of skeletal dosimetry.

Generic image for table
TABLE II.

Tissues masses used in the paired-image radiation transport (PIRT) model (100% marrow cellularity). The marrow volume fractions are taken from the 3D microCT images of excised sections of spongiosa.

Generic image for table
TABLE III.

Ratio of the radionuclide value for an active marrow (TAM) target as given by the voxel-based infinite spongiosa transport (VBIST) model to that given by the paired-image radiation transport (PIRT) model.

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/content/aapm/journal/medphys/32/5/10.1118/1.1898463
2005-04-18
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Accounting for beta-particle energy loss to cortical bone via paired-image radiation transport (PIRT)
http://aip.metastore.ingenta.com/content/aapm/journal/medphys/32/5/10.1118/1.1898463
10.1118/1.1898463
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