Title: Multicentre treatment planning study of MRI-guided brachytherapy for cervical cancer: Comparison between tandem-ovoid applicator users
Authors: Nomden, Christel N ×
de Leeuw, Astrid A C
Van Limbergen, Erik
De Brabandere, Marisol
Nulens, An
Nout, Remi A
Laman, Mirjam
Ketelaars, Martijn
Lutgens, Ludovicus
Reniers, Brigitte
Jürgenliemk-Schulz, Ina Maria #
Issue Date: Apr-2013
Publisher: Elsevier Science Publishers
Series Title: Radiotherapy and Oncology vol:107 issue:1 pages:82-7
Article number: S0167-8140(12)00445-8
Abstract: BACKGROUND AND PURPOSE: To compare MRI-guided treatment planning approaches between four centres that use tandem-ovoid applicators. MATERIAL AND METHODS: Four centres generated three treatment plans for four patients: standard, optimised intracavitary, and optimised intracavitary/interstitial. Prescribed D90 High-Risk CTV (HR-CTV) was 85Gy EQD2 (external-beam radiotherapy and brachytherapy), while the D(2cc) OAR limit was 90Gy EQD2 for bladder and 75Gy EQD2 for rectum, sigmoid, and bowel, respectively. DVH-parameters, source loading patterns and spatial dose distributions of the three treatment plans were compared. RESULTS: The standard plans of the different centres were comparable with respect to the D90 HR-CTV, but differed in OAR doses. MRI-guided intracavitary optimisation resulted in organ sparing and smaller variation in DVH parameters between the centres. Adding interstitial needles led to target dose escalation while respecting the OAR constraints. However, substantial differences in relative weights of the applicator parts resulted in an increased variation in DVH parameters and locations of high dose regions. CONCLUSIONS: MRI-guided brachytherapy treatment planning optimisation provides the possibility to increase the dose to the HR-CTV and spare the OARs. Depending on the degree of conformity the centres make different choices in relative weighting of applicator parts, leading to different dose distributions.
ISSN: 0167-8140
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory of Experimental Radiotherapy
× corresponding author
# (joint) last author

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