Relationship between dosimetric leaf gap and dose calculation errors for high definition multi-leaf collimators in radiotherapy
نویسندگان
چکیده
منابع مشابه
Spatial variation of Dosimetric Leaf Gap and the impact in Dose delivery Our work evaluates the variation of Dosimetric Leaf Gap (DLG) along the travel path of each
Our work evaluates the variation of Dosimetric Leaf Gap (DLG) along the travel path of each Varian Millennium 120-MLC leaf pairs. Traditionally, the Treatment Planning Systems (TPS) utilize a single value of DLG measured under the middle leaf-pair. The TPS models the shape of the leaf tip as straight as opposed to rounded edge. To overcome this limitation, the TPS retracts each leaf tip by half...
متن کاملOn using the dosimetric leaf gap to model the rounded leaf ends in VMAT/RapidArc plans
Partial transmission through rounded leaf ends of Varian multileaf collimators (MLC) is accounted for with a parameter called the dosimetric leaf gap (DLG). Verification of the value of the DLG is needed when the dose delivery is accompanied by gantry rotation in VMAT plans. We compared the doses measured with GAFCHROMIC film and an ionization chamber to treatment planning system (TPS) calculat...
متن کاملEvaluation of fluence‐based dose delivery incorporating the spatial variation of dosimetric leaf gap (DLG)
The Eclipse treatment planning system uses a single dosimetric leaf gap (DLG) value to retract all multileaf collimator leaf positions during dose calculation to model the rounded leaf ends. This study evaluates the dosimetric impact of the 2D variation of DLG on clinical treatment plans based on their degree of fluence modulation. In-house software was developed to retrospectively apply the 2D...
متن کاملthe relationship between academic self-concept and academic achievement in english and general subjects of the students of high school
according to research, academic self-concept and academic achievement are mutually interdependent. in the present study, the aim was to determine the relationship between the academic self-concept and the academic achievement of students in english as a foreign language and general subjects. the participants were 320 students studying in 4th grade of high school in three cities of noor, nowshah...
Determining the optimal dosimetric leaf gap setting for rounded leaf‐end multileaf collimator systems by simple test fields
Individual QA for IMRT/VMAT plans is required by protocols. Sometimes plans cannot pass the institute's QA criteria. For the Eclipse treatment planning system (TPS) with rounded leaf-end multileaf collimator (MLC), one practical way to improve the agreement of planned and delivered doses is to tune the value of dosimetric leaf gap (DLG) in the TPS from the measured DLG. We propose that this ste...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics and Imaging in Radiation Oncology
سال: 2018
ISSN: 2405-6316
DOI: 10.1016/j.phro.2018.01.003