Dosimetric studies in breast external beam radiotherapy treatments with the presence of the tissue expander with metallic valve.

Lamia D., Iacoviello G., Abbate B.F., D'Alia F., Cespuglio D., Greco E., Tomasello F., Caputo V.

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V - Biofisica e fisica medica
Aula 32C-2 - Giovedì 20 h 09:00 - 13:00
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In a surgical mastectomy the surgeon may implant a temporary tissue expander subcutaneously. Many patients undergo radiotherapy treatments before the permanent breast reconstruction. The steel valve in the tissue expander causes cold spots and an average dose reduction in the treatment plan. A statistical study was performed to analyze isodose curves and Dose-Volume Histograms. We carried out in-vivo dosimetric measurements and also in anthropomorphic and solid phantoms with and without the tissue expander. A selected underdosed area was analyzed and dose profiles were obtained. A comparison between the experimental results and ones calculated by the software was carried out.

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