Agreement Between Institutional Measurements and Treatment Planning System Calculations for Basic Dosimetric Parameters as Measured by the Imaging and Radiation Oncology Core-Houston.
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 effor...
| Publicado en: | International Journal of Radiation Oncology, Biology, Physics Vol. 95; no. 5; pp. 1527 - 1535 |
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| Autores principales: | , , , , , , |
| Formato: | research Journal Article |
| Publicado: |
Pergamon Press - An Imprint of Elsevier Science
Aug2016
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=116842428&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 116842428 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 03603016 1ZQ jtl: International Journal of Radiation Oncology, Biology, Physics issn: 03603016 maglogo: N pubinfo: dt: Aug2016 vid: 95 iid: 5 pid: 2410 pub: Pergamon Press - An Imprint of Elsevier Science artinfo: ui: 116842428 116842428 NLM27315667 116842428 10.1016/j.ijrobp.2016.03.035 NLM27315667 116842428 ppf: 1527 ppct: 8 formats: tig: atl: Agreement Between Institutional Measurements and Treatment Planning System Calculations for Basic Dosimetric Parameters as Measured by the Imaging and Radiation Oncology Core-Houston. aug: au: Kerns, James R. Followill, David S. Lowenstein, Jessica Molineu, Andrea Alvarez, Paola Taylor, Paige A. Kry, Stephen F. affil: Department of Radiation Physics, The University of Texas Health Science Center-Houston, Houston, Texas sug: subj: Radiation Dosage Neoplasms Radiotherapy Algorithms Radiotherapy, Conformal Methods Radiotherapy, Computer-Assisted Methods Radiometry Methods Radiotherapy, Computer-Assisted Equipment and Supplies Texas Reproducibility of Results Sensitivity and Specificity Radiotherapy, Conformal Equipment and Supplies Radiometry Equipment and Supplies Validation Studies Comparative Studies Evaluation Research Multicenter Studies Funding Source ab: 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. pubtype: Academic Journal doctype: research Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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