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Title: Multiparametric fit method in reconstruction of Fletcher-Suit-Delclos applicator

Abstract

In our institution we have introduced the variable angle reconstruction method with a nonisocentric C-arm as brachytherapy localizer in gynecological treatments. The main advantage of this method is that on the posterior oblique images the ovoids of the Fletcher-Suit-Delclos (FSD) applicator are clearly separated. The main problem with the nonisocentric machine is that the magnification factor is not known exactly and varies with the C-arm angle. For generation of treatment plans with a commercial brachytherapy planning system the magnification factors of the reconstruction images have to be determined previously. We present a multiparametric fit method (MPF) that is suitable for reconstruction of FSD applicators and that utilizes pairs of posterior-anterior and lateral or preferably posterior oblique reconstruction images obtained by a C-arm. The MPF reconstruction relies on the known geometry of the tandem and the ovoid. The actual FSD insertion is reconstructed by adaptation of the geometry of tandem and ovoid by translations and rotations. The fixation mechanism limits the possible excursions of the FSD applicator's parts. The limited freedom of excursions and the determination of the magnification factors are also incorporated.

Authors:
 [1]
  1. A. Petz County Teaching Hospital, Gyor, Zrinyi str. 13, H-9002 Gyor, Pf. 92 (Hungary)
Publication Date:
OSTI Identifier:
20774987
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 33; Journal Issue: 1; Other Information: DOI: 10.1118/1.2138012; (c) 2006 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; BRACHYTHERAPY; EXCURSIONS; GEOMETRY; GYNECOLOGY; IMAGE PROCESSING; IMAGES; PLANNING

Citation Formats

Palvolgyi, Jeno. Multiparametric fit method in reconstruction of Fletcher-Suit-Delclos applicator. United States: N. p., 2006. Web. doi:10.1118/1.2138012.
Palvolgyi, Jeno. Multiparametric fit method in reconstruction of Fletcher-Suit-Delclos applicator. United States. doi:10.1118/1.2138012.
Palvolgyi, Jeno. Sun . "Multiparametric fit method in reconstruction of Fletcher-Suit-Delclos applicator". United States. doi:10.1118/1.2138012.
@article{osti_20774987,
title = {Multiparametric fit method in reconstruction of Fletcher-Suit-Delclos applicator},
author = {Palvolgyi, Jeno},
abstractNote = {In our institution we have introduced the variable angle reconstruction method with a nonisocentric C-arm as brachytherapy localizer in gynecological treatments. The main advantage of this method is that on the posterior oblique images the ovoids of the Fletcher-Suit-Delclos (FSD) applicator are clearly separated. The main problem with the nonisocentric machine is that the magnification factor is not known exactly and varies with the C-arm angle. For generation of treatment plans with a commercial brachytherapy planning system the magnification factors of the reconstruction images have to be determined previously. We present a multiparametric fit method (MPF) that is suitable for reconstruction of FSD applicators and that utilizes pairs of posterior-anterior and lateral or preferably posterior oblique reconstruction images obtained by a C-arm. The MPF reconstruction relies on the known geometry of the tandem and the ovoid. The actual FSD insertion is reconstructed by adaptation of the geometry of tandem and ovoid by translations and rotations. The fixation mechanism limits the possible excursions of the FSD applicator's parts. The limited freedom of excursions and the determination of the magnification factors are also incorporated.},
doi = {10.1118/1.2138012},
journal = {Medical Physics},
number = 1,
volume = 33,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}