PMID: 11929023Apr 4, 2002Paper

Communication and sampling rate limitations in IMRT delivery with a dynamic multileaf collimator system

Medical Physics
Ping XiaLynn J Verhey

Abstract

The delivery of an intensity modulated radiation field with a dynamic multileaf collimator (MLC) requires precise correlation between MLC positions and cumulative monitor units (MUs). The purpose of this study is to investigate the precision of this correlation as a function of delivered MUs and dose rate. A semi-Gaussian shaped intensity profile and a simple geometric intensity pattern consisting of four square segments were designed to deliver a total of 1, 4, 16, 64, and 100 MUs at three different dose rates of 100, 400, and 600 MU/min. The semi-Gaussian intensity pattern was delivered using both sliding window and step and shoot techniques. The dose profiles of this intensity pattern were measured with films. The four square intensity pattern was delivered using step and shoot and conventional delivery techniques for comparison. Because of geometrical symmetry, the dose to each segment in this intensity pattern is expected to be the same when the same MU is assigned to each segment. An ionization chamber was used to measure the dose in the center of each of the four square segments. For the semi-Gaussian shaped profile, significant artifacts were observed when the profile was delivered with small MUs and/or at a high dose r...Continue Reading

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Citations

Feb 4, 2012·Australasian Physical & Engineering Sciences in Medicine·S A YoganathanShaleen Kumar
Aug 24, 2012·Journal of Radiation Research·Shimpei HashimotoHidetoshi Saitoh
Oct 9, 2012·Medical Physics·Pejman RowshanfarzadPeter B Greer
May 16, 2006·Medical Physics·V Y Kuperman, W C Lam
Nov 4, 2011·Medical Physics·Richard A Popple, Ivan A Brezovich
Aug 14, 2009·Medical Physics·Alejandra Rangel, Peter Dunscombe
Feb 7, 2007·Medical Physics·Dale W LitzenbergIndrin J Chetty
Aug 11, 2006·Medical Physics·Wei LuoChang-Ming Ma
Dec 20, 2011·Seminars in Radiation Oncology·Benedick A Fraass, Jean M Moran
Sep 8, 2010·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·Mike OliverWayne Beckham
May 24, 2008·International Journal of Radiation Oncology, Biology, Physics·Thomas Losasso
Jan 22, 2008·International Journal of Radiation Oncology, Biology, Physics·Louis LeeLei Xing
Apr 4, 2006·Hematology/oncology Clinics of North America·Joseph Y Ting, Todd J Scarbrough
Aug 30, 2003·Medical Physics·Jun DuanPrem N Pareek
May 30, 2003·Medical Physics·Jonathan G LiJatinder R Palta
Jun 26, 2018·Physics in Medicine and Biology·Cheukkai HuiWilliam Watkins
Aug 17, 2006·Physics in Medicine and Biology·James C L Chow, Grigor N Grigorov
Jan 21, 2006·Physics in Medicine and Biology·Grigor N GrigorovRob B Barnett
Jul 28, 2016·Journal of Applied Clinical Medical Physics·Heming ZhenArnold Pompos
May 12, 2016·Journal of Applied Clinical Medical Physics·Long HuangPing Xia
Mar 9, 2005·Journal of Applied Clinical Medical Physics·Sha X ChangJulian G Rosenman

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