Useful island block geometries of a passive intensity modulator used for intensity-modulated bolus electron conformal therapy.

Journal of Applied Clinical Medical Physics
Erin L ChambersKenneth R Hogstrom

Abstract

This project determined the range of island block geometric configurations useful for the clinical utilization of intensity-modulated bolus electron conformal therapy (IM-BECT). Multiple half-beam island block geometries were studied for seven electron energies 7-20 MeV at 100 and 103 cm source-to-surface distance (SSD). We studied relative fluence distributions at 0.5 cm and 2.0 cm depths in water, resulting in 28 unique beam conditions. For each beam condition, we studied intensity reduction factor (IRF) values of 0.70, 0.75, 0.80, 0.85, 0.90, and 0.95, and hexagonal packing separations for the island blocks of 0.50, 0.75, 1.00, 1.25, and 1.50 cm, that is, 30 unique IM configurations and 840 unique beam-IM combinations. A combination was deemed acceptable if the average intensity downstream of the intensity modulator agreed within 2% of that intended and the variation in fluence was less than ±2%. For 100 cm SSD, and for 0.5 cm depth, results showed that beam energies above 13 MeV did not exhibit sufficient scatter to produce clinically acceptable fluence (intensity) distributions for all IRF values (0.70-0.95). In particular, 20 MeV fluence distributions were unacceptable for any values, and acceptable 16 MeV fluence distrib...Continue Reading

References

Jan 1, 1991·Medical Physics·A S Shiu, K R Hogstrom
May 1, 1981·Physics in Medicine and Biology·K R HogstromP R Almond
Dec 1, 1995·International Journal of Radiation Oncology, Biology, Physics·D A LowK R Hogstrom
Nov 13, 2001·International Journal of Radiation Oncology, Biology, Physics·G H PerkinsK R Hogstrom
Jul 4, 2002·International Journal of Radiation Oncology, Biology, Physics·Rajat J KudchadkerJohn A Antolak
Nov 8, 2003·Journal of Applied Clinical Medical Physics·R J KudchadkerK R Hogstrom
Apr 9, 2004·Medical Physics·Kenneth R HogstromJulian G Rosenman
Jun 23, 2006·Physics in Medicine and Biology·Kenneth R Hogstrom, Peter R Almond
Nov 18, 2006·Physics in Medicine and Biology·T GauerR Schmidt
Feb 19, 2011·Journal of Applied Clinical Medical Physics·Omar A ZeidanSanford L Meeks
Oct 8, 2011·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Michelle M KimGeorge H Perkins
Nov 10, 2013·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Dan OppEleanor E Harris
Sep 11, 2014·Journal of Applied Clinical Medical Physics·Shiqin SuJames L Robar
Sep 7, 2017·Journal of Applied Clinical Medical Physics·Kenneth R HogstromKevin Erhart

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