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Title: Adaptation of telecobalt unit for stereotactic irradiation

Abstract

We investigated the feasibility of using an isocentric telecobalt unit for advanced treatment techniques, such as stereotactic radiotherapy. To adapt the telecobalt unit (Th780 C) for stereotactic irradiation, collimator inserts of various sizes, collimator mount, and a couch mount suitable for the telecobalt unit were developed, and the characteristics of the narrow beams of Cobalt-60 ({sup 60}Co) were studied. Comparative study was carried out between the stereotactic radiotherapy plans of 6 MV and {sup 60}Co beams using a 3-dimensional (3D) treatment planning system. The beam penumbra of {sup 60}Co beams was found to be larger than those of 6 MV beams. The dose-volume histograms (DVH) obtained from the {sup 60}Co beam plan were comparable to those obtained from the 6 MV plan. The DVH of nontarget tissue obtained from the plans of the 2 beams were found to be in good agreement to each other. The difference in equivalent fall-off distance (EFOD) for all 3 cases was found insignificant; hence, it can be concluded that the fall-off dose in the dose distribution of the {sup 60}Co stereotactic plan is as good as that of the 6 MV stereotactic plan. In all 3 cases for which the treatment plans were comparedmore » between {sup 60}Co and 6 MV beams, it was observed that the fall-off doses outside the target were similar; therefore, considering {sup 60}Co with 5-mm margin is a cost effective alternative for the linac-based stereotactic radiotherapy.« less

Authors:
 [1];  [2];  [3]
  1. Department of Radiotherapy, Christian Medical College, Vellore, 632004 (India). E-mail: rabiraja@cmcvellore.ac.in
  2. Department of Radiotherapy, Christian Medical College, Vellore, 632004 (India)
  3. Department of Radiation Oncology, University of Nebraska Medical Center, Omaha, NE (United States)
Publication Date:
OSTI Identifier:
20975202
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Dosimetry; Journal Volume: 32; Journal Issue: 1; Other Information: DOI: 10.1016/j.meddos.2006.11.001; PII: S0958-3947(06)00173-7; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; BEAMS; COBALT 60; COLLIMATORS; IRRADIATION; LINEAR ACCELERATORS; PLANNING; RADIATION DOSE DISTRIBUTIONS; RADIATION DOSES; RADIOTHERAPY

Citation Formats

Singh, I. Rabi Raja, Ravindran, B. Paul, and Ayyangar, K.M. Adaptation of telecobalt unit for stereotactic irradiation. United States: N. p., 2007. Web. doi:10.1016/j.meddos.2006.11.001.
Singh, I. Rabi Raja, Ravindran, B. Paul, & Ayyangar, K.M. Adaptation of telecobalt unit for stereotactic irradiation. United States. doi:10.1016/j.meddos.2006.11.001.
Singh, I. Rabi Raja, Ravindran, B. Paul, and Ayyangar, K.M. Sun . "Adaptation of telecobalt unit for stereotactic irradiation". United States. doi:10.1016/j.meddos.2006.11.001.
@article{osti_20975202,
title = {Adaptation of telecobalt unit for stereotactic irradiation},
author = {Singh, I. Rabi Raja and Ravindran, B. Paul and Ayyangar, K.M.},
abstractNote = {We investigated the feasibility of using an isocentric telecobalt unit for advanced treatment techniques, such as stereotactic radiotherapy. To adapt the telecobalt unit (Th780 C) for stereotactic irradiation, collimator inserts of various sizes, collimator mount, and a couch mount suitable for the telecobalt unit were developed, and the characteristics of the narrow beams of Cobalt-60 ({sup 60}Co) were studied. Comparative study was carried out between the stereotactic radiotherapy plans of 6 MV and {sup 60}Co beams using a 3-dimensional (3D) treatment planning system. The beam penumbra of {sup 60}Co beams was found to be larger than those of 6 MV beams. The dose-volume histograms (DVH) obtained from the {sup 60}Co beam plan were comparable to those obtained from the 6 MV plan. The DVH of nontarget tissue obtained from the plans of the 2 beams were found to be in good agreement to each other. The difference in equivalent fall-off distance (EFOD) for all 3 cases was found insignificant; hence, it can be concluded that the fall-off dose in the dose distribution of the {sup 60}Co stereotactic plan is as good as that of the 6 MV stereotactic plan. In all 3 cases for which the treatment plans were compared between {sup 60}Co and 6 MV beams, it was observed that the fall-off doses outside the target were similar; therefore, considering {sup 60}Co with 5-mm margin is a cost effective alternative for the linac-based stereotactic radiotherapy.},
doi = {10.1016/j.meddos.2006.11.001},
journal = {Medical Dosimetry},
number = 1,
volume = 32,
place = {United States},
year = {Sun Apr 01 00:00:00 EDT 2007},
month = {Sun Apr 01 00:00:00 EDT 2007}
}