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http://dx.doi.org/10.14316/pmp.2015.26.4.223

Evaluation of Dosimetric Characteristics of a Double-focused Dynamic Micro-Multileaf Collimator (DMLC)  

Kim, Ae Ran (Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea)
Seo, Jae-Hyuk (Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea)
Shin, Hun-Joo (Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea)
Park, Hyeong Wook (Department of Medical Physics, Kyonggi University of Korea)
Lee, Ki Woong (Department of Medical Physics, Kyonggi University of Korea)
Lee, Jae Choon (Department of Medical Physics, Kyonggi University of Korea)
Kim, Shin-Wook (Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea)
Kim, Ji Na (Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea)
Park, Hyeli (Department of Radiation Oncology, Presbyterian Medical Center of Korea)
Lee, Heui-Kwan (Department of Radiation Oncology, Presbyterian Medical Center of Korea)
Kang, Young-Nam (Department of Radiation Oncology, Seoul St. Mary's Hospital, The Catholic University of Korea)
Publication Information
Progress in Medical Physics / v.26, no.4, 2015 , pp. 223-228 More about this Journal
Abstract
Double-focused micro-Multileaf Collimator (${\mu}MLC$) is able to create radiation fields having sharper dose gradients at the field edges than common MLC. Therefore, ${\mu}MLC$ has been used for the stereotactic radiosurgery (SRS) and Stereotactic Radiotherapy (SRT). We evaluated the dosimetric characteristics of a doublefocused Dynamic-${\mu}MLC$ (DMLC) attached to the Elekta Synergy linear accelerator. For this study, the dosimetric parameters including, Percent Depth Dose (PDD), Leaf leakage and penumbra, have been measured by using of the radiochromic films (GafChromic EBT2), EDGE diode detector and three-dimensional water phantom. All datas were measured on 6 MV x-ray. As a result, The DMLC shows transmission below to 1% and because of double-focused construction of the DMLC, the penumbras of fields with DMLC are independent from the field sizes. In this paper, the resulting dosimetric evaluations proved the applicability of the DMLC attached to the Elekta Synergy linear accelerator.
Keywords
Dynamic micro-Multileaf Collimator; PDD; Leaf transmission; Penumbra;
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