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If no CT (US and MRI)
➢
Use contoured organs with recommended tissue
compositions
▪
For
192
Ir, water is a good approximation for soft tissues
only.
▪
Air, lung, bone, … should be assigned correctly
o
Could potentially be generated on MRI (Yu et al., IJROBP, In
press; DOI: 10.1016/j.ijrobp.2014.03.028)
➢
Use accurate source and applicators geometry and
composition
Recommendations