RETROSPEVTİVE STUDY OF TARGET VOLUME AND CRİTİCAL ORGAN DOSES USİNG THREE VOLUMETRİC ARC THERAPY (VMAT) TECNİQUES İN HEAD AND NECK CANCER (H&N) RADİOTHERAPY

Öz

The aim of this study is the target volüme dose and critical organ doses in three different radiotherapy plans reported with the volumetric arc therapy (VMAT) teqniques in head and neck cancer (H&N) radiotherapy

            In radiotherapy plans, with 8 H&N patients; the form of double rotation 1 arc (sVMAT), double ark (dVMAT) and 15⁰ collimator angles (cVMAT) plans have been prepared.

            In three methods, the prescribed dose of the target volüme could be given in the desired way. No significant difference was abserved in the values of the left and right parotid D_mean, however, the sVMAT tecnique for the right parotid was found lower dose value.

In three different plans, sVAMT dose was provided in the desired way and organ doses could be kept within the desired limits. However the low dose value obtanied from the parotid gland and the brain stem has made sVMAT tecnique superior to other tecniques.

Anahtar Kelimeler

• Colimator Angle,Head and Neck Cancer (H&N),Monaco,VMAT

Baş Boyun Kanseri (H&N) Radyoterapisinde Üç Farklı Hacimsel Ayarlı Ark Terapi (VMAT) Tekniği İle Hedef Hacim ve Kritik Organ Dozlarının Retrospektif İncelenmesi

Öz

Baş boyun kanseri (H&N) radyoterapisinde hacimsel ayarlı ark terapi (VMAT) tekniği ile hazırlanan üç farklı radyoterapi planında, hedef hacim dozu ve kritik organ dozlarını incelemesi hedeflenmiştir.

Çalışmada 8 baş boyun kanseri (H&N) tanılı olgu değerlendirildi. Radyoterapi planlarında; çift rotasyon şeklinde 1 ark (sVMAT), çift ark (dVMAT) ve 15⁰ kolimatör açılı olacak şekilde (cVMAT) planları hazırlandı.

Üç yöntemde hedef hacme reçete edilen doz istenilen şekilde verilebilmiştir. Sağ ve sol parotis D_mean değerlerinde anlamlı fark gözlenmemiş ancak sağ parotis için sVMAT tekniği daha düşük doz aldığı görülmüştür.

Üç farklı planda tümör dozu istenilen şekilde sağlanmıştır ve organ dozlarımız istenilen sınırlar içerisinde tutulabilmiştir. Ancak parotis bezi ve beyin sapında elde edilen düşük doz değeri sVMAT tekniğini diğer tekniklere göre üstün kılmıştır.

Anahtar Kelimeler

• Baş Boyun Kanseri,Kolimatör açısı,Monaco,VMAT

Kaynakça

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