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Neoplasma Vol.51, p.390-394, 2004 |
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Title: Experimental lens-sparing optimization in therapeutic orbital irradiation with electron beams | ||
Author: K., OYSUL ; B., DIRICAN ; M., BEYZADEOGLU ; S., SURENKOK ; Y., PAK ; | ||
Abstract: There has been a number of approaches in the literature for
therapeutic malignant and benign orbital irradiation. All
techniques intend to deliver a homogenous dose to the orbital and
retroorbital target volume while sparing the lens of excessive
dose. In this experimental lens-sparing study, 4 MeV and 12 MeV
anterior electron irradiation has been used with cerrobend
shielding circular blocks of varying diameter and thickness placed
on a thin Mylar at the distal tip of the electron applicator to
spare the lens. The first phase of the study in water phantom has
been designed to determine the shield thickness and diameter
constant for 4 MeV and 12 MeV electron beams. After optimizing the
lens dose by water phantom, the second phase of our study has been
designed to measure doses at lens and other specific localizations
in randophantom under same conditions with 4 MeV and 12 MeV
electron beams. By this technique lens accumulated 18.56% of
prescribed dose and lateral aspects of the lens received 44.59% of
the prescribed dose in 4 MeV electron irradiation, whereas this
was 13.86% and 44.80%, respectively in 12 MeV electron
irradiation. The technique used is found to be an extremely simple
and effective technique allowing an easier setup with excellent
dose distribution characteristics with lens sparing applicable to
orbital irradiation practice.
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Keywords: orbital irradiation, cataract, lens | ||
Year: 2004, Volume: 51, Issue: | Page From: 390, Page To: 394 | |
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