Evaluation of dosimetric effect of leaf position in a radiation field of an 80-leaf multileaf collimator fitted to the LINAC head as a tertiary collimator
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چکیده
منابع مشابه
Evaluation of dosimetric effect of leaf position in a radiation field of an 80‐leaf multileaf collimator fitted to the LINAC head as a tertiary collimator
This study evaluates changes in the dosimetric characteristics of a Varian Millennium 80-leaf multileaf collimator (MLC) in a radiation field. In this study, dose rate, scatter factor, percentage depth dose, surface dose and dose in the buildup region, beam profile, flatness and symmetry, and penumbra width measurements were made for 6-MV and 15-MV photon beams. Analysis of widths between 50% d...
متن کاملRounded leaf end effect of multileaf collimator on penumbra width and radiation field offset: an analytical and numerical study
BACKGROUND Penumbra characteristics play a significant role in dose delivery accuracy for radiation therapy. For treatment planning, penumbra width and radiation field offset strongly influence target dose conformity and organ at risk sparing. METHODS In this study, we present an analytical and numerical approach for evaluation of the rounded leaf end effect on penumbra characteristics. Based...
متن کاملOptimal Multileaf Collimator Leaf Sequencing in IMRT Treatment Planning
We consider a problem dealing with the efficient delivery of Intensity Modulated Radiation Therapy (IMRT) to individual patients. IMRT treatment planning is usually performed in three phases. The first phase determines a set of beam angles through which radiation is delivered, followed by a second phase that determines an optimal radiation intensity profile (or fluence map). This intensity prof...
متن کاملDetermining 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...
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ژورنال
عنوان ژورنال: Journal of Applied Clinical Medical Physics
سال: 2006
ISSN: 1526-9914
DOI: 10.1120/jacmp.v7i3.2310