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Validation of a method for "dose of the day" calculation in head-neck tomotherapy by using planning ct-to-MVCT deformable image registration.
Branchini, M; Fiorino, C; Dell'Oca, I; Belli, M L; Perna, L; Di Muzio, N; Calandrino, R; Broggi, S.
Afiliação
  • Branchini M; Medical Physics Department, San Raffaele Scientific Institute, Milano, Italy.
  • Fiorino C; Medical Physics Department, San Raffaele Scientific Institute, Milano, Italy.
  • Dell'Oca I; Radiotherapy Department, San Raffaele Scientific Institute, Milano, Italy.
  • Belli ML; Medical Physics Department, San Raffaele Scientific Institute, Milano, Italy.
  • Perna L; Medical Physics Department, San Raffaele Scientific Institute, Milano, Italy.
  • Di Muzio N; Radiotherapy Department, San Raffaele Scientific Institute, Milano, Italy.
  • Calandrino R; Medical Physics Department, San Raffaele Scientific Institute, Milano, Italy.
  • Broggi S; Medical Physics Department, San Raffaele Scientific Institute, Milano, Italy. Electronic address: broggi.sara@hsr.it.
Phys Med ; 39: 73-79, 2017 Jul.
Article em En | MEDLINE | ID: mdl-28619289
ABSTRACT

PURPOSE:

The aim of this study was to test the feasibility and dosimetric accuracy of a method that employs planning CT-to-MVCT deformable image registration (DIR) for calculation of the daily dose for head and neck (HN) patients treated with Helical Tomotherapy (HT).

METHODS:

For each patient, the planning kVCT (CTplan) was deformably registered to the MVCT acquired at the 15th therapy session (MV15) with a B-Spline Free Form algorithm using Mattes mutual information (open-source software 3D Slicer), resulting in a deformed CT (CTdef). On the same day as MVCT15, a kVCT was acquired with the patient in the same treatment position (CT15). The original HT plans were recalculated both on CTdef and CT15, and the corresponding dose distributions were compared; local dose differences <2% of the prescribed dose (DD2%) and 2D/3D gamma-index values (2%-2mm) were assessed respectively with Mapcheck SNC Patient software (Sun Nuclear) and with 3D-Slicer.

RESULTS:

On average, 87.9%±1.2% of voxels were found for DD2% (on average 27 slices available for each patient) and 94.6%±0.8% of points passed the 2D gamma analysis test while the 3D gamma test was satisfied in 94.8%±0.8% of body's voxels.

CONCLUSIONS:

This study represents the first demonstration of the dosimetric accuracy of kVCT-to-MVCT DIR for dose of the day computations. The suggested method is sufficiently fast and reliable to be used for daily delivered dose evaluations in clinical strategies for adaptive Tomotherapy of HN cancer.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Doses de Radiação / Planejamento da Radioterapia Assistida por Computador / Tomografia Computadorizada por Raios X / Radioterapia de Intensidade Modulada / Neoplasias de Cabeça e Pescoço Limite: Humans Idioma: En Ano de publicação: 2017 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Doses de Radiação / Planejamento da Radioterapia Assistida por Computador / Tomografia Computadorizada por Raios X / Radioterapia de Intensidade Modulada / Neoplasias de Cabeça e Pescoço Limite: Humans Idioma: En Ano de publicação: 2017 Tipo de documento: Article