کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8248303 1533328 2017 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Identification of the suitable leaf margin for liver stereotactic body radiotherapy with flattening filter-free beams
ترجمه فارسی عنوان
شناسایی حاشیه برگ مناسب برای پرتودرمانی بدن استریوتاکتیک کبد با پرتوهای پر از فیلتر بدون پر شدن
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم تشعشع
چکیده انگلیسی
The purpose of this study is to identify the suitable leaf margin for liver stereotactic body radiotherapy (SBRT) with flattening filter-free (FFF) beams, as compared with that with flattening filter (FF) beams. SBRT treatment planning for 10 patients with liver cancer was performed using 10-MV FFF and FF beams obtained from a Varian TrueBeam (Varian Medical Systems, Palo Alto, CA) linear accelerator. Each plan was generated with the leaf margin to the planning target volume (PTV) ranging from −3 to 5 mm. The prescription dose at D95 (dose covering 95% of the volume) was 48 Gy in 4 fractions to the PTV. The following dosimetric parameters were evaluated quantitatively: homogeneity index (HI), conformity index (CI), gradient index (GI), the normal liver receiving a dose greater than or equal to 20 Gy (V20), and the mean normal liver dose. The HI for FFF and FF beams increased as the leaf margin decreased. The leaf margins that achieved the best CI and GI were 0.1 and −0.3 mm for FFF beams, and 0.1 and −0.9 mm for FF beams. The liver V20 and the mean liver dose reached their minimum values at leaf margins of −0.8 and 0.0 mm for FFF beams, and −0.8 and 0.0 mm for FF beams. The suitable leaf margin for SBRT planning did not differ significantly for FFF and FF beams. Our data showed that, for both FFF and FF beams, a leaf margin of 0 or −1 mm was optimal for liver SBRT planning in terms of both target coverage and normal tissue sparing.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Medical Dosimetry - Volume 42, Issue 4, Winter 2017, Pages 268-272
نویسندگان
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