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      Global availability of dosimetry audits in radiotherapy: The IAEA dosimetry audit networks database

      brief-report
      Author(s): * , 1 ,
      Publication date (Electronic):
      Journal: Physics and Imaging in Radiation Oncology
      Publisher: Elsevier

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          Abstract

          The International Atomic Energy Agency (IAEA) has established a database describing activities of dosimetry audit networks (DAN) in radiotherapy. Since 2010 the data on different aspects of the dosimetry audit have been collected. This information has allowed for the analysis and comparison of current practices in dosimetry auditing activities worldwide. Overall, 79 organizations in 58 countries confirmed that they offer dosimetry audit services for radiotherapy; however, access of radiotherapy centres to the audit remains insufficient. Increased availability of audits is necessary to improve dosimetry practices, reduce the likelihood of errors and the consequences that would result for patients’ health.

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          Institutional patient-specific IMRT QA does not predict unacceptable plan delivery.

          Jackie Tonigan, Stephen Kry, Andrea Molineu … (2014)
          To determine whether in-house patient-specific intensity modulated radiation therapy quality assurance (IMRT QA) results predict Imaging and Radiation Oncology Core (IROC)-Houston phantom results.
          Article 0 comments Cited 41 times – based on 0 reviews     Review now
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            The Radiological Physics Center's standard dataset for small field size output factors

            David Followill, Stephen Kry, Lihong Qin … (2012)
            Delivery of accurate intensity‐modulated radiation therapy (IMRT) or stereotactic radiotherapy depends on a multitude of steps in the treatment delivery process. These steps range from imaging of the patient to dose calculation to machine delivery of the treatment plan. Within the treatment planning system's (TPS) dose calculation algorithm, various unique small field dosimetry parameters are essential, such as multileaf collimator modeling and field size dependence of the output. One of the largest challenges in this process is determining accurate small field size output factors. The Radiological Physics Center (RPC), as part of its mission to ensure that institutions deliver comparable and consistent radiation doses to their patients, conducts on‐site dosimetry review visits to institutions. As a part of the on‐site audit, the RPC measures the small field size output factors as might be used in IMRT treatments, and compares the resulting field size dependent output factors to values calculated by the institution's treatment planning system (TPS). The RPC has gathered multiple small field size output factor datasets for X‐ray energies ranging from 6 to 18 MV from Varian, Siemens and Elekta linear accelerators. These datasets were measured at 10 cm depth and ranged from 10 × 10   cm 2 to 2 × 2   cm 2 . The field sizes were defined by the MLC and for the Varian machines the secondary jaws were maintained at a 10 × 10   cm 2 . The RPC measurements were made with a micro‐ion chamber whose volume was small enough to gather a full ionization reading even for the 2 × 2   cm 2 field size. The RPC measured output factors are tabulated and are reproducible with standard deviations (SD) ranging from 0.1% to 2.4%, while the institutions' calculated values had a much larger SD range, ranging up to 7.9%. The absolute average percent differences were greater for the 2 × 2   cm 2 than for the other field sizes. The RPC's measured small field output factors provide institutions with a standard dataset against which to compare their TPS calculated values. Any discrepancies noted between the standard dataset and calculated values should be investigated with careful measurements and with attention to the specific beam model. PACS number: 87.53.Bn
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              A multi-institutional dosimetry audit of rotational intensity-modulated radiotherapy.

              Catharine H. Clark, Mohammad Fouad Hussein, Yatman Tsang … (2014)
              Rotational IMRT (VMAT and Tomotherapy) has now been implemented in many radiotherapy centres. An audit to verify treatment planning system modelling and treatment delivery has been undertaken to ensure accurate clinical implementation.
              Article 0 comments Cited 9 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Joanna Izewska
                Journal
                Journal ID (nlm-ta): Phys Imaging Radiat Oncol
                Journal ID (iso-abbrev): Phys Imaging Radiat Oncol
                Title: Physics and Imaging in Radiation Oncology
                Publisher: Elsevier
                ISSN (Electronic): 2405-6316
                Publication date PMC-release: 10 January 2018
                Publication date Collection: January 2018
                Publication date (Electronic): 10 January 2018
                Volume: 5
                Pages: 1-4
                Affiliations
                International Atomic Energy Agency, Vienna International Centre, PO Box 100, A-1400 Vienna, Austria
                Author notes
                [* ]Corresponding author. j.izewska@ 123456iaea.org
                [1]

                Present address: Medical University of Vienna, Spitalgasse 23, 1090 Vienna, Austria and Christian Doppler Laboratory for Medical Radiation Research for Radiation Oncology, Währingergürtel 18-20, 1090 Wien Vienna, Austria.

                Article
                Publisher Item ID: S2405-6316(17)30055-6
                DOI: 10.1016/j.phro.2017.12.002
                PMC ID: 7807735
                PubMed ID: 33458360
                SO-VID: a859b414-3002-48db-aebd-baee0ea3d9db
                Copyright © © 2017 The Authors
                License:

                This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

                History
                Date received : 4 September 2017
                Date revision received : 12 December 2017
                Date accepted : 18 December 2017
                Categories
                Subject: Short Communication

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