نتایج جستجو برای: multileaf collimator

تعداد نتایج: 3034  

2016
Ae Ran Kim Hyeong Wook Park Woong Lee Jae Choon Lee Hyeli Park Heui-Kwan Lee Young-Nam Kang

223 This work was supported by the fusion research program of Korea research council for industrial science and technology (B551179-1208-00, Development of Convergent Radio Therapy Equipment with O-arm CT) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). Received 1 December 2015, Revised 28 December 2015, Accepted 28 December 2015 Correspondence: Young-Nam Kang (ynkang33@gmail...

Journal: :Physics in medicine and biology 2004
J D Fenwick W A Tomé H A Jaradat S K Hui J A James J P Balog C N DeSouza D B Lucas G H Olivera T R Mackie B R Paliwal

Helical tomotherapy has been developed at the University of Wisconsin, and 'Hi-Art II' clinical machines are now commercially manufactured. At the core of each machine lies a ring-gantry-mounted short linear accelerator which generates x-rays that are collimated into a fan beam of intensity-modulated radiation by a binary multileaf, the modulation being variable with gantry angle. Patients are ...

M. Allahverdi, M. Hoseini-Ghahfarokhi, M. Shahriari, M. Zabihzadeh, M.R. Ay, S.R. Mahdavi,

Background: During intensity modulated radiation therapy (IMRT) technique, theoretically, presence of flattening filter (FF) across the beamline of clinical linear accelerator (linac) is not essential to obtain uniform lateral profiles due to intensity modulation of photon beams by multileaf collimators (MLCs). The aim of this study was to investigate the dosimetrical properties of 18 MV photon...

Journal: :Physics in medicine and biology 2014
A Agnew C E Agnew M W D Grattan A R Hounsell C K McGarry

This work investigated the differences between multileaf collimator (MLC) positioning accuracy determined using either log files or electronic portal imaging devices (EPID) and then assessed the possibility of reducing patient specific quality control (QC) via phantom-less methodologies. In-house software was developed, and validated, to track MLC positional accuracy with the rotational and sta...

Journal: :Physics in medicine and biology 2006
Oleg N Vassiliev Uwe Titt Falk Pönisch Stephen F Kry Radhe Mohan Michael T Gillin

Basic dosimetric properties of 6 MV and 18 MV photon beams from a Varian Clinac 21EX accelerator operating without the flattening filter have been measured. These include dose rate data, depth dose dependencies and lateral profiles in a water phantom, total scatter factors and transmission factors of a multileaf collimator. The data are reviewed and compared with measurements for the flattened ...

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