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Title: Technique for routine output verification of Leipzig applicators with a well chamber

Abstract

The H-type Leipzig applicators are accessories of the microSelectron-HDR system (Nucletron, Veenendaal, The Netherlands) for treatment of superficial malignancies. Recently, the dose rate distributions in liquid water for the whole set of applicators using both source models available for the microSelectron-HDR afterloaders have been obtained by means of the experimentally validated Monte Carlo (MC) code GEANT4. Also an output table (cGy/hU) at 3 mm depth on the applicator central axis was provided. The output verification of these applicators by the user, prior to their clinical use, present practical problems: small detectors such as thermoluminescent dosimeters or parallel-plate ionization chambers are not easily used for verification in a clinical environment as they require a rigid setup with the Leipzig applicator and a phantom. In contrast, well-type ionization chambers are readily available in radiotherapy departments. This study presents a technique based on the HDR1000Plus well chamber (Standar Imaging) measurements with a special insert, which allows the output verification of the H-type Leipzig applicators on a routine basis. This technique defines correspondence factors (CF) between the in water dose rate output of the Leipzig applicators (cGy/hU) obtained with MC and the reading on the well chamber with the special insert, normalized to themore » HDR calibration factor with the HDR insert and to the source strength. To commission the applicators (with the well chamber and the special insert used), the physicist should check if the CF value agrees with its tabulated values presented in this work. If the differences are within 5% the tabulated output values can be used in clinical dosimetry. This technique allows the output validation of the Leipzig applicators with a well chamber widely used for HDR Ir-192 source strength measurements. It can easily be adapted to other types of well chambers for HDR source output verification.« less

Authors:
; ; ; ;  [1];  [2];  [2];  [3]
  1. Physics Section, Radiation Oncology Department. 'La Fe' University Hospital, Avda Campanar 21, E46009 Valencia (Spain) and ITIC, Clinica Benidorm, Avda. Alfonso Puchades 8, E03500 Benidorm (Spain)
  2. (Spain)
  3. (Netherlands)
Publication Date:
OSTI Identifier:
20774970
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 33; Journal Issue: 1; Other Information: DOI: 10.1118/1.2138008; (c) 2006 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
61 RADIATION PROTECTION AND DOSIMETRY; BRACHYTHERAPY; DOSE RATES; DOSIMETRY; GAMMA DETECTION; IONIZATION CHAMBERS; IRIDIUM 192; MONTE CARLO METHOD; NEOPLASMS; NETHERLANDS; PHANTOMS; PRODUCTION; THERMOLUMINESCENT DOSEMETERS; VALIDATION; VERIFICATION

Citation Formats

Perez-Calatayud, J., Granero, D., Ballester, F., Crispin, V., Laarse, R. van der, Department of Atomic, Molecular and Nuclear Physics and IFIC, University of Valencia-CSIC, Dr. Moliner 50, E46100 Burjassot, FIVO, Fundacion Instituto Valenciano de Oncologia, Beltran Baguena 9, E46009 Valencia, and Nucletron BV, Waardgelder 1, 3905 TH Veenendaal. Technique for routine output verification of Leipzig applicators with a well chamber. United States: N. p., 2006. Web. doi:10.1118/1.2138008.
Perez-Calatayud, J., Granero, D., Ballester, F., Crispin, V., Laarse, R. van der, Department of Atomic, Molecular and Nuclear Physics and IFIC, University of Valencia-CSIC, Dr. Moliner 50, E46100 Burjassot, FIVO, Fundacion Instituto Valenciano de Oncologia, Beltran Baguena 9, E46009 Valencia, & Nucletron BV, Waardgelder 1, 3905 TH Veenendaal. Technique for routine output verification of Leipzig applicators with a well chamber. United States. doi:10.1118/1.2138008.
Perez-Calatayud, J., Granero, D., Ballester, F., Crispin, V., Laarse, R. van der, Department of Atomic, Molecular and Nuclear Physics and IFIC, University of Valencia-CSIC, Dr. Moliner 50, E46100 Burjassot, FIVO, Fundacion Instituto Valenciano de Oncologia, Beltran Baguena 9, E46009 Valencia, and Nucletron BV, Waardgelder 1, 3905 TH Veenendaal. Sun . "Technique for routine output verification of Leipzig applicators with a well chamber". United States. doi:10.1118/1.2138008.
@article{osti_20774970,
title = {Technique for routine output verification of Leipzig applicators with a well chamber},
author = {Perez-Calatayud, J. and Granero, D. and Ballester, F. and Crispin, V. and Laarse, R. van der and Department of Atomic, Molecular and Nuclear Physics and IFIC, University of Valencia-CSIC, Dr. Moliner 50, E46100 Burjassot and FIVO, Fundacion Instituto Valenciano de Oncologia, Beltran Baguena 9, E46009 Valencia and Nucletron BV, Waardgelder 1, 3905 TH Veenendaal},
abstractNote = {The H-type Leipzig applicators are accessories of the microSelectron-HDR system (Nucletron, Veenendaal, The Netherlands) for treatment of superficial malignancies. Recently, the dose rate distributions in liquid water for the whole set of applicators using both source models available for the microSelectron-HDR afterloaders have been obtained by means of the experimentally validated Monte Carlo (MC) code GEANT4. Also an output table (cGy/hU) at 3 mm depth on the applicator central axis was provided. The output verification of these applicators by the user, prior to their clinical use, present practical problems: small detectors such as thermoluminescent dosimeters or parallel-plate ionization chambers are not easily used for verification in a clinical environment as they require a rigid setup with the Leipzig applicator and a phantom. In contrast, well-type ionization chambers are readily available in radiotherapy departments. This study presents a technique based on the HDR1000Plus well chamber (Standar Imaging) measurements with a special insert, which allows the output verification of the H-type Leipzig applicators on a routine basis. This technique defines correspondence factors (CF) between the in water dose rate output of the Leipzig applicators (cGy/hU) obtained with MC and the reading on the well chamber with the special insert, normalized to the HDR calibration factor with the HDR insert and to the source strength. To commission the applicators (with the well chamber and the special insert used), the physicist should check if the CF value agrees with its tabulated values presented in this work. If the differences are within 5% the tabulated output values can be used in clinical dosimetry. This technique allows the output validation of the Leipzig applicators with a well chamber widely used for HDR Ir-192 source strength measurements. It can easily be adapted to other types of well chambers for HDR source output verification.},
doi = {10.1118/1.2138008},
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}
}