Representative vertebral images used in the voxel-based transport model. A reconstruction of a microCT image of spongiosa is given as well as a transverse slice through the data set showing bone trabecula (black) and bone marrow (white).
Electron absorbed fractions to the active bone marrow within the (a) lumbar vertebra, (b) cervical vertebra, (c) ilium, and (d) cranium of the UF male. Two simulation methods are compared: voxel-based (solid lines) and chord-based (dashed lines) simulations, along with their respective convergence values.
Electron absorbed fractions the trabecular endosteum within the (a) ilium and (b) ribs of the UF male. Two simulation methods are compared: voxel-based (solid lines) and chord-based (dashed lines) simulations, along with their respective convergence values.
Illustration of external (-random) chord lengths traversing a spherical marrow cavity lined with a endosteal layer. Large marrow cavity chords are associated with small endosteal chords ( and ) and vice versa.
Acronyms and terms used in the present study.
Mean values of trabecular and marrow cavity chord lengths as given by the present UF study and those published from the University of Leeds Ref. 12. Values of mean chord lengths across the endosteal layer and the marrow space (which in combination define the marrow cavity) are shown as well based upon the CBIST algorithm presented in this study. Values for source-independent absorbed fractions at high electron energies (convergence limits) are given for TBE, TMS, and TBV targets in both the Leeds and UF bone sites. At the bottom of the table, corresponding values of convergence limits under VBIST simulations are shown.
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