tailieunhanh - Báo cáo khoa học: "Rotational IMRT techniques compared to fixed gantry IMRT and Tomotherapy: multi-institutional planning study for head-and-neck cases"

Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: Rotational IMRT techniques compared to fixed gantry IMRT and Tomotherapy: multi-institutional planning study for head-and-neck cases. | Wiezorek et al. Radiation Oncology 2011 6 20 http content 6 1 20 RADIATION ONCOLOGY RESEARCH Open Access Rotational IMRT techniques compared to fixed gantry IMRT and Tomotherapy multi-institutional planning study for head-and-neck cases Til - . A i - -7z- .r -Jz1Ti D -Pr A Í-Í--71 - r 2 E ịs D I I 3 I k s2 I_I p. I 5 A A F p I r IX r S-. I- m f V4 IIIQ wiezoreK Tim Brachwitz Dietmar Georg tycK BlanK Irina round Gregor Habl Matthias Kretschmer Gerd Lutters6 Henning Saiz1 Kai Schubert5 Daniela Wagner7 Thomas G Wendt1 Abstract Background Recent developments enable to deliver rotational IMRT with standard C-arm gantry based linear accelerators. This upcoming treatment technique was benchmarked in a multi-center treatment planning study against static gantry IMRT and rotational IMRT based on a ring gantry for a complex parotid gland sparing head-and-necK technique. Methods Treatment plans were created for 10 patients with head-and-necK tumours oropharynx hypopharynx larynx using the following treatment planning systems TPS for rotational IMRT Monaco ELEKTA VMAT solution Eclipse Varian RapidArc solution and HiArt for the helical tomotherapy Tomotherapy . Planning of static gantry IMRT was performed with KonRad Pinnacle and Panther DAO based on step shoot IMRT delivery and Eclipse for sliding window IMRT. The prescribed doses for the high dose PTVs were or and for the low dose PTVs or dependend on resection status. Plan evaluation was based on target coverage conformity and homogeneity DVHs of OARs and the volume of normal tissue receiving more than 5Gy V5Gy . Additionally the cumulative monitor units MUs and treatment times of the different technologies were compared. All evaluation parameters were averaged over all 10 patients for each technique and planning modality. Results Depending on IMRT technique and TPS the mean CI values of all patients ranged from to and mean HI values varied from to . The mean

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