Important implementation details
All calculation settings are preset!
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user specifies D output grid (affects t) and resolution (affects t &
accuracy)
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D calculation grid is automatically defined as the D output grid +10
cm in all directions, unless CT image boundary is reached
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Density is HU based through a user editable calibration
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Material assignment is based on a density lookup table and data
from ICRP 23 (1975)