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Comparison of outcomes between overlapping structure-based and non-overlapping structure-based optimization for simultaneous integrated boost IMRT for malignant gliomas.

Abstract：

BACKGROUND:Intensity-modulated radiotherapy (IMRT) can deliver different doses to two target volumes with high conformity. The purpose of the present study was to compare outcomes provided by two different optimization methods, overlapping structure-based and non-overlapping structure-based methods, for simultaneous integrated boost (SIB)-IMRT for malignant gliomas. METHODS:Treatment plans for three glioblastomas and one anaplastic astrocytoma were analyzed in the present study. The planning protocol was to deliver 70 Gy/28 fractions (fr) to the gross tumor volume (GTV) and 56 Gy/28 fr to the surrounding edema. Two different optimization methods were tested for optimizing dose distribution to the GTVand the surrounding edema. One method was the "including method", an overlapping structure-based (GTV and the clinical target volume [CTV]) optimization method. The other method was the "annulus method", a non-overlapping structure-based (GTV and the subtracted volume) optimization method. Dosimetric indexes derived from dose-volume histograms (DVHs) were used for the analysis. RESULTS:There was no significant difference between the two methods in the mean doses of the target volumes and the doses delivered to the 5% or 95% target volumes (D05 or D95). The mean dose to the brain by the including method was significantly higher than that delivered by the annulus method (P = 0.0001). The D05 of the brain showed no significant difference between the two methods. CONCLUSION:The two optimization methods provided comparable dose distributions within the target volumes and normal brain.

journal_name

Int J Clin Oncol

journal_title

International journal of clinical oncology

authors

Suzuki M,Nakamatsu K,Kanamori S,Okajima K,Okumura M,Nishimura Y

doi

10.1007/s10147-004-0433-1

subject

Has Abstract

pub_date

2004-12-01 00:00:00

pages

491-7

issue

6

eissn

1341-9625

issn

1437-7772

journal_volume

9

pub_type

临床试验,杂志文章

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