Dose Course 2018_Flipping book

Other image possibilities

MRI images? ❑ MRI superior soft tissue contrast ❑ Lower intraobserver variation ❑ Smaller margins ❑ Bulk density assignment? ❑ Bone must be delineated on the scans ❑ Doses not as accurate as could be ❑ DRR’s difficult

Dowling IJROBP 83 (2012). Prostate

❑ Atlas-based electron density mapping method ❑ MRI atlas built up from number of patients ❑ Corresponding CT data sets ❑ Patient MRI mapped to atlas, same vectors applied to CT Atlas ❑ PseudoCT and planning CT dose differences 95% <2%/2mm. ❑ Full examination of uncertainties needed ❑ How similar is anatomy of patients?