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Balloon-based techniques: MammoSite, Axxent, Contura
MammoSite
Placed during surgery or US-guided through scar or small insertion
Ct scan for planning
Important:
-balloon conformance to the lumpectomy cavity
-distance from surface of balloon to skin surface, minimum 5 mm, optimal
>7 mm
-symmetry of the balloon in relation to the central catheter
Treatment planning parameters are:
-the diameter of the inflated balloon
-PTV (adequate conformance of balloon to cavity is considered when less
than 10% of PTV is composed of fluid or air)
-dose distribution