Sol Meme Kanseri Radyoterapisi SimülasyonundaPron pozisyon mu Supin pozisyon mu ?

Amaç : Bu çalışmanın amacı meme koruyucu cerrahi sonrası adjuvant radyoterapi uygulanmış sol meme kanseri tanısı olan hastalarda pron ve supin radyoterapi pozisyonlarının hedef hakim ve kritik organ dozları açısından karşılaştırılmasıdır. Gereç ve Yöntem : Hedef hakim ve kritik organ dozları doz-hacim histogramları kullanılarak değerlendirildi. Bulgular : Ortalama kalp dozu pron pozisyonda düşük bulundu ( pron ve supin pozisyon için sırasıyla 656 cGy ve 933 cGy ( p=0.01) bulundu.Pron ve supin pozisyonlar için ortalama akciğer dozları sırasıyla 396 cGy ve 1032 cGy (p=0.01); akciğer V5 %13 ve %33 (p=0.01); akciğer V10 %8 ve %25 (p=0.01); akciğer akciğer V20 %5 ve %17 (p=0.01) olarak tespit edildi. Sonuç: Kritik organlardaki düşük dozlar değerlendirildiğinde sol meme kanseri radyoterapisinde prone poziyonun tercih edilebileceği söylenebilir.

In Left-Sided Breast Cancer Radiotherapy Simulation; Prone or Supine position?

Aim: The aim of this study was to compare radiation doses of target volumes and critical organs among prone and supine positions for left-sided breast cancer patients who were treated with breast-conserving surgery and adjuvant radiotherapy. Materials and Methods: The doses of critical organs and target volumes were evaluated by using dose-volume histograms on the new radiotherapy plans of twenty patients. Results: The mean heart dose was lower in the prone position (mean heart doses 656cGy and 933cGy respectively p = 0.01). Mean lung doses for prone and supine positions were 396 cGy and 1032 cGy (p =0.01); lung V5 13% and 33% (p =0.01); lung V10 8% and 25% (p =0.01); lung V20 5% and 17% (p =0.01). Conclusion: Considering that lower doses of normal structures may reduce side effects, prone position may be preferred in patients with left breast cancer.

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