当前位置： SCI文献检索 > Journal of Cancer Research and Therapeutics期刊下所有文献 > Which is the most optimal technique to spare hippocampus?-Dosimetric comparisons of SCRT, IMRT, and tomotherapy.

Which is the most optimal technique to spare hippocampus?-Dosimetric comparisons of SCRT, IMRT, and tomotherapy.

Abstract：

AIMS:To evaluate current focal high precision radiotherapy (RT) techniques to spare hippocampi most optimally, in view of mounting clinical evidence to preserve neurocognition. MATERIALS AND METHODS:Computed tomography/magnetic resonance imaging (CT/MRI) datasets of 10 patients with benign/low-grade brain tumors, treated with focal conformal RT were replanned with helical tomotherapy (Tomo), intensity-modulated radiotherapy (IMRT) with high definition multileaf collimator (HD-MLC), and forward planning stereotactic conformal radiotherapy (SCRT). The primary planning objective was to encompass 99% of planning target volume (PTV) by 95% of prescribed dose (54 Gy/30#). Assessments included target coverage (TC), homogeneity index (HI), and maximum (max) and minimum (min) dose. Hippocampal dose was assessed with mean, maximum, minimum, median dosem and various dose levels. RESULTS:Mean V 95 for PTV coverage in Tomo, IMRT, and SCRT were 99.7, 99.4, and 98.3%, respectively. PTV coverage was significantly better in Tomo and IMRT compared to SCRT (P = 0.03). Tomotherapy (HI ≤ 0.06) and IMRT (HI ≤ 0.06) plans were more homogenous than SCRT (HI > 0.7) (P = 0.00). Right hippocampus mean dose with Tomo (20Gy) was 18.5% less than SCRT (30 Gy); but for left hippocampus, difference decreased to 3.3% (Tomo-32.2Gy and SCRT-34Gy). At 30% dose level, 9% more volume of right hippocampus was treated in IMRT and 20% in SCRT when compared to Tomo plan. At 80% dose, 6 and 12% more volumes were treated with IMRT and SCRT, respectively, in comparison to Tomo plan. For left hippocampus all three techniques were comparable. CONCLUSION:Tomotherapy and Linear accelerator (LINAC)-based IMRT achieved significantly better PTV coverage than forward planned SCRT. Tomo as compared to SCRT and IMRT plans showed trend towards significant sparing of the contralateral hippocampus, in eccentrically located tumors.

journal_name

J Cancer Res Ther

journal_title

Journal of cancer research and therapeutics

authors

Kothavade V,Jamema SV,Gupta T,Pungavkar S,Upasani M,Juvekar S,Jalali R

doi

10.4103/0973-1482.157310

subject

Has Abstract

pub_date

2015-04-01 00:00:00

pages

358-63

issue

eissn

0973-1482

issn

1998-4138

pii

JCanResTher_2015_11_2_358_157310

journal_volume

pub_type

杂志文章

在线工具

Which is the most optimal technique to spare hippocampus?-Dosimetric comparisons of SCRT, IMRT, and tomotherapy.