Dergiler / Uluslararası Hematoloji-Onkoloji Dergisi / 2018 / Cilt: 28 - Sayı: 4

The Feasibility of Sparing the Hippocampus and Hypothalamic -Hypophysial Axis During Whole Brain Radiotherapy: A Dosimetric Study

Tüm Beyin Radyoterapisi Esnasında Hipokampüs ve Hipotalamo-Hipofizer Aksın Korunabilirliği: Dozimetrik Çalışma

Sayfa
208–216
DOI
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⚡ TL;DR(1 Cümlede Hızlı Çıkarım)

This study demonstrated the feasibility of sparing the hippocampus and HHA simultaneously during WBRT with helical tomotherapy regarding target dose coverage and dose constraints suggested by the literature.

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Amaç & Hipotez:We aimed to investigate the feasibility of simultaneously sparing the hippocampus and hypothalamic-hypophysial axis (HHA) during whole brain radiotherapy (WBRT) using helical tomotherapy.
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Temel Bulgular & Veri:Images of totally 12 patients were analyzed.
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Sonuç & Katkı:This study demonstrated the feasibility of sparing the hippocampus and HHA simultaneously during WBRT with helical tomotherapy regarding target dose coverage and dose constraints suggested by the literature.
🔬Tür:Araştırma Makalesi
📍Kapsam:Genişletilmiş Akademik Örneklem
⚙️Değişkenler:Alan Parametreleri

Özet

We aimed to investigate the feasibility of simultaneously sparing the hippocampus and hypothalamic-hypophysial axis (HHA) during whole brain radiotherapy (WBRT) using helical tomotherapy. Images of totally 12 patients were analyzed. Hippocampi and HHA were delineated according to available guidelines. First, radiotherapy plans were analyzed according to dose constraints of the Radiation Therapy Oncology Group-0933 for 30 Gy (3 Gy/fr). Second, dose constraints were decreased by 1/6 to simulate the 25 Gy prophylactic cranial irradiation practice. The mean D98% and D2% was 25.9±0.85 Gy and 35.0±1.32 Gy, and 21.4±0.40 Gy and 30.5±1.33 Gy for planning target volumes in the original and modified protocol plans, respectively. The D100% and Dmax for the hippocampus was 8.1±0.47 Gy and 15.7±0.84 Gy in the original and 7.1±0.68 Gy and 13.2±1.08 Gy in the modified protocol, respectively. The mean doses for the hypothalamus and hypophysis was 12.6±0.76 Gy and 11.4±1.22 Gy in the original and 10.8±1.38 Gy and 9.8±1.50 Gy in the modified plans, respectively. This study demonstrated the feasibility of sparing the hippocampus and HHA simultaneously during WBRT with helical tomotherapy regarding target dose coverage and dose constraints suggested by the literature.

Abstract

Tüm beyin radyoterapisi (TBR) esnasında hipokampüs ve hipotalamo-hipofizer aksın (HHA) eşzamanlı olarak helikal tomoterapi yardımıyla korunabilirliğini araştırmayı amaçladık. Toplam 12 hastanın görüntüleri analiz edilmiştir. Hipokampüs ve HHA mevcut rehberlere göre konturlanmıştır. İlk olarak hastalar 30 Gy (3 Gy/fr) için Radiation Therapy Oncology Group-0933 doz sınırlamalarına göre analiz edilmiştir. İkinci olarak ise doz kısıtlamaları 1/6 oranında azaltılarak 25 Gy’lik proflaktik kranial radyoterapi pratiği simüle edilmiştir. Orjinal ve modifiye edilen protokollerde ortalama D%98 ve D%2 sırasıyla 25.9±0.85 Gy ve 35.0±1.32 Gy; 21.4±0.40 Gy ve 30.5±1.33 Gy olarak bulunmuştur. Orjinal planda hipokampüs için D100% ve Dmax sırasıyla 8.1±0.47 Gy ve 15.7±0.84 Gy iken modifiye planda 7.1±0.68 Gy ve 13.2±1.08 Gy olarak tespit edilmiştir. Orjinal plandaki ortalama hipotalamus ve hipofiz dozları 12.6±0.76 Gy ve 11.4±1.22 Gy; modifiye planda ise 10.8±1.38 Gy ve 9.8±1.50 Gy olarak bulunmuştur. Bu çalışma literatür tarafından önerilen doz sınırlamaları ve hedef doz sarımı açısından helical tomoterapiyle hipokampüs ve HHA’ın aynı anda korunabilir olduğunu gösterir niteliktedir.

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Bu Makaleye Atıf Yap

OZDEMIR, Y., ACIBUCI, İ., TOPKAN, E. (2018). The Feasibility of Sparing the Hippocampus and Hypothalamic -Hypophysial Axis During Whole Brain Radiotherapy: A Dosimetric Study. Uluslararası Hematoloji-Onkoloji Dergisi, Cilt: 28 - Sayı: 4, 208–216. https://ajindex.com/articles/322784

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