![]() ![]() However, the downsizing effect of the MLC leaf width decreased with the use of a more precise RT technique and a more sophisticated grade of the same technique. Regarding the target coverage, there were dosimetric benefits of a smaller MLC leaf width. TVC improved by 0.66% and 0.43%, and CI also improved by 0.93%, and 0.52% in 1-arc and 2-arc VMAT, respectively. The TVC and CI improved by 1.68% and 1.67% in IMRT, respectively, and by 0.54% and 0.72% in VMAT, respectively. Upon replacing the 5-mm MLC with the 2.5-mm MLC, TVC and CI improved by 1.30% and 1.36%, respectively, in total plans. The downsizing effects of MLC leaf width were analyzed using target volume coverage (TVC), conformity index (CI), dose gradient index (GI), and normal tissue difference 70% isodose line and 50% isodose line. The treatment plans were performed according to the size of the MLC (5-mm and 2.5-mm MLC), the type of technique (IMRT and VMAT), and the sophisticated grades of each technique (5-field, 9-field, 13-field, 17-field technique in IMRT and 1-arc and 2-arc techniques in VMAT). ![]() Nineteen patients with pituitary adenomas were selected for this study. We analyzed the difference in the dosimetric effect between 5-mm and 2.5-mm multileaf collimator (MLC) leaf width according to the sophisticated grades of intensity-modulated radiotherapy (IMRT) and volumetric-modulated arc therapy (VMAT). Received: AugAccepted: OctoPublished: October 28, 2016 Seok Hyun Son, email: multi-leaf collimator, radiosurgery, intensity-modulated radiotherapy, volumetric modulated arc therapy ![]() Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea Soo-Min Chae 1, Ki Woong Lee 1, Seok Hyun Son 2ġDepartment of Radiation Oncology, Cheju Halla General Hospital, Jeju, KoreaĢDepartment of Radiation Oncology, Incheon St. ![]()
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