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Title: Agreement Between Institutional Measurements and Treatment Planning System Calculations for Basic Dosimetric Parameters as Measured by the Imaging and Radiation Oncology Core-Houston

Abstract

Purpose: To compare radiation machine measurement data collected by the Imaging and Radiation Oncology Core at Houston (IROC-H) with institutional treatment planning system (TPS) values, to identify parameters with large differences in agreement; the findings will help institutions focus their efforts to improve the accuracy of their TPS models. Methods and Materials: Between 2000 and 2014, IROC-H visited more than 250 institutions and conducted independent measurements of machine dosimetric data points, including percentage depth dose, output factors, off-axis factors, multileaf collimator small fields, and wedge data. We compared these data with the institutional TPS values for the same points by energy, class, and parameter to identify differences and similarities using criteria involving both the medians and standard deviations for Varian linear accelerators. Distributions of differences between machine measurements and institutional TPS values were generated for basic dosimetric parameters. Results: On average, intensity modulated radiation therapy–style and stereotactic body radiation therapy–style output factors and upper physical wedge output factors were the most problematic. Percentage depth dose, jaw output factors, and enhanced dynamic wedge output factors agreed best between the IROC-H measurements and the TPS values. Although small differences were shown between 2 common TPS systems, neither was superior to the other.more » Parameter agreement was constant over time from 2000 to 2014. Conclusions: Differences in basic dosimetric parameters between machine measurements and TPS values vary widely depending on the parameter, although agreement does not seem to vary by TPS and has not changed over time. Intensity modulated radiation therapy–style output factors, stereotactic body radiation therapy–style output factors, and upper physical wedge output factors had the largest disagreement and should be carefully modeled to ensure accuracy.« less

Authors:
;  [1];  [2];  [2]; ; ; ;  [1];  [2];  [1];  [2];  [2]
  1. Department of Radiation Physics, The University of Texas Health Science Center-Houston, Houston, Texas (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
22648773
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Radiation Oncology, Biology and Physics; Journal Volume: 95; Journal Issue: 5; Other Information: Copyright (c) 2016 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; BIOMEDICAL RADIOGRAPHY; DEPTH DOSE DISTRIBUTIONS; DOSIMETRY; LINEAR ACCELERATORS; RADIOTHERAPY

Citation Formats

Kerns, James R., Followill, David S., Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas, Graduate School of Biomedical Sciences, The University of Texas Health Science Center-Houston, Houston, Texas, Lowenstein, Jessica, Molineu, Andrea, Alvarez, Paola, Taylor, Paige A., Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas, Kry, Stephen F., E-mail: sfkry@mdanderson.org, Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas, and Graduate School of Biomedical Sciences, The University of Texas Health Science Center-Houston, Houston, Texas. Agreement Between Institutional Measurements and Treatment Planning System Calculations for Basic Dosimetric Parameters as Measured by the Imaging and Radiation Oncology Core-Houston. United States: N. p., 2016. Web. doi:10.1016/J.IJROBP.2016.03.035.
Kerns, James R., Followill, David S., Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas, Graduate School of Biomedical Sciences, The University of Texas Health Science Center-Houston, Houston, Texas, Lowenstein, Jessica, Molineu, Andrea, Alvarez, Paola, Taylor, Paige A., Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas, Kry, Stephen F., E-mail: sfkry@mdanderson.org, Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas, & Graduate School of Biomedical Sciences, The University of Texas Health Science Center-Houston, Houston, Texas. Agreement Between Institutional Measurements and Treatment Planning System Calculations for Basic Dosimetric Parameters as Measured by the Imaging and Radiation Oncology Core-Houston. United States. doi:10.1016/J.IJROBP.2016.03.035.
Kerns, James R., Followill, David S., Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas, Graduate School of Biomedical Sciences, The University of Texas Health Science Center-Houston, Houston, Texas, Lowenstein, Jessica, Molineu, Andrea, Alvarez, Paola, Taylor, Paige A., Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas, Kry, Stephen F., E-mail: sfkry@mdanderson.org, Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas, and Graduate School of Biomedical Sciences, The University of Texas Health Science Center-Houston, Houston, Texas. Mon . "Agreement Between Institutional Measurements and Treatment Planning System Calculations for Basic Dosimetric Parameters as Measured by the Imaging and Radiation Oncology Core-Houston". United States. doi:10.1016/J.IJROBP.2016.03.035.
@article{osti_22648773,
title = {Agreement Between Institutional Measurements and Treatment Planning System Calculations for Basic Dosimetric Parameters as Measured by the Imaging and Radiation Oncology Core-Houston},
author = {Kerns, James R. and Followill, David S. and Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas and Graduate School of Biomedical Sciences, The University of Texas Health Science Center-Houston, Houston, Texas and Lowenstein, Jessica and Molineu, Andrea and Alvarez, Paola and Taylor, Paige A. and Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas and Kry, Stephen F., E-mail: sfkry@mdanderson.org and Imaging and Radiation Oncology Core-Houston, The University of Texas Health Science Center-Houston, Houston, Texas and Graduate School of Biomedical Sciences, The University of Texas Health Science Center-Houston, Houston, Texas},
abstractNote = {Purpose: To compare radiation machine measurement data collected by the Imaging and Radiation Oncology Core at Houston (IROC-H) with institutional treatment planning system (TPS) values, to identify parameters with large differences in agreement; the findings will help institutions focus their efforts to improve the accuracy of their TPS models. Methods and Materials: Between 2000 and 2014, IROC-H visited more than 250 institutions and conducted independent measurements of machine dosimetric data points, including percentage depth dose, output factors, off-axis factors, multileaf collimator small fields, and wedge data. We compared these data with the institutional TPS values for the same points by energy, class, and parameter to identify differences and similarities using criteria involving both the medians and standard deviations for Varian linear accelerators. Distributions of differences between machine measurements and institutional TPS values were generated for basic dosimetric parameters. Results: On average, intensity modulated radiation therapy–style and stereotactic body radiation therapy–style output factors and upper physical wedge output factors were the most problematic. Percentage depth dose, jaw output factors, and enhanced dynamic wedge output factors agreed best between the IROC-H measurements and the TPS values. Although small differences were shown between 2 common TPS systems, neither was superior to the other. Parameter agreement was constant over time from 2000 to 2014. Conclusions: Differences in basic dosimetric parameters between machine measurements and TPS values vary widely depending on the parameter, although agreement does not seem to vary by TPS and has not changed over time. Intensity modulated radiation therapy–style output factors, stereotactic body radiation therapy–style output factors, and upper physical wedge output factors had the largest disagreement and should be carefully modeled to ensure accuracy.},
doi = {10.1016/J.IJROBP.2016.03.035},
journal = {International Journal of Radiation Oncology, Biology and Physics},
number = 5,
volume = 95,
place = {United States},
year = {Mon Aug 01 00:00:00 EDT 2016},
month = {Mon Aug 01 00:00:00 EDT 2016}
}