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Comparison of effective target volume between MammoSite
and 3D CRT
Problem: different cavity expansion used depending on technique, MammoSite
1.0 cm, 3D CRT 1.5 cm. Previously stated that this is effectively equivalent.
But is that true?
10 pts treated with MammoSite, CT scan before and after balloon implantation
Deformable registration was used to deform the MammoSite CTV onto the
balloonless CT scan. This takes into account asymmetric cavity and that
tissue around the MammoSite is stretched during inflation of balloon
Shaitelman et al, IJROBP, 2012
MammoSite with CTV, 1.0cm margin
Effective CTV generated by deforming the MammoSite
CTV onto the pre-MammoSite CT. Arrows indicate
anatomical features for accuracy
CTV effective