PMID: 2493432Feb 1, 1989Paper

Optimization of electron arc therapy doses by multi-vane collimator control

International Journal of Radiation Oncology, Biology, Physics
D D LeavittL Earley

Abstract

Retrospective computer simulations, based on clinical treatment planning data available from over 50 patients treated by electron arc radiotherapy to the chestwall following mastectomy, show that a dramatic improvement in dose uniformity can, in many clinical situations, be achieved by dynamic shaping of the electron arc collimator, under computer control, as a function of gantry angle and distance superior or inferior to the central plane. The greatest improvement in dose uniformity is seen in calculational planes in which the patient contour has the greatest departure from a circular shape. Dosimetric studies demonstrate this improvement. Indicators for use of variable-width multi-vane electron arc collimators include the following: (1) Mechanical constraints of the therapy equipment may limit the placement of isocenter to an inadequate depth which causes large variation in the SSD around the arc; (2) Out of the central plane, the shape of the chest wall may change dramatically across the limits of the arc, creating large variations in the dose distribution; (3) Clinical definition of the treatment surface to include surgical scars or other at-risk volume may create an irregularly shaped treatment surface, thereby changing th...Continue Reading

References

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Jun 1, 1988·International Journal of Radiation Oncology, Biology, Physics·L K McNeelyJ R Stewart
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Citations

Jan 1, 1995·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·M ToblerJ K Hayes
Nov 1, 1996·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·E E KleinD A Low
Jul 1, 1997·International Journal of Radiation Oncology, Biology, Physics·G A SandisonJ Morphis
Mar 1, 1993·The British Journal of Radiology·M R McKenzieE B Podgorsak
Jul 1, 1990·International Journal of Radiation Oncology, Biology, Physics·D D LeavittL Earley
Apr 2, 1993·International Journal of Radiation Oncology, Biology, Physics·L A NedziJ S Loeffler
Aug 11, 2006·Medical Physics·Pai-Chun M ChiJohn A Antolak
Apr 9, 2004·Medical Physics·Kenneth R HogstromJulian G Rosenman
Apr 13, 2005·Otolaryngologic Clinics of North America·Meisong DingDavid Raben
Jun 23, 2006·Physics in Medicine and Biology·Kenneth R Hogstrom, Peter R Almond
Dec 20, 2013·Physics in Medicine and Biology·Anna RodriguesQiuwen Wu
Jun 12, 1998·Physics in Medicine and Biology·M G KarlssonB Zackrisson
Jul 2, 2010·Journal of Applied Clinical Medical Physics·Ahmed Abdel Rahman EldibNader A Elsherbini

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