DEMAT: A multi-institutional dosimetry audit of rotational and static intensity-modulated radiotherapy

Lafond, C.; Chiavassa, S.; Bertaut, C.; Boussion, Nicolas; Chapel, Nathalie; Chapron, Lucie; Coste, Frédéric; Crespin, S.; Dy, Gilles; Faye, Papa Abdoulaye; Leleu, C.; Bouvier, Jeanne; Madec, Ludovic; Mesgouez, J.; Palisson, J.; Véla, A.; Delpon, G.

doi:10.1016/j.ejmp.2016.04.008

Cited by 12 publications

(9 citation statements)

References 26 publications

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“…The γ provides the means for an efficient analysis which is particularly important within a busy clinical environment [3]. It has also been used effectively within dosimetry audits of complex radiotherapy [44][45][46][47][48]. If one is performing a retrospective analysis of patient-specific QA in order to streamline the process, the γ provides a suitable means to explore trends over a period of time [49,50].…”

Section: Further Considerations Of the Gamma Index Computationmentioning

confidence: 99%

Challenges in calculation of the gamma index in radiotherapy – Towards good practice

2017

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Section: Further Considerations Of the Gamma Index Computationmentioning

confidence: 99%

Challenges in calculation of the gamma index in radiotherapy – Towards good practice

2017

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“…The overall results showed excellent agreement of the measured and planned doses, and they were in line with other multi-institutional IMRT/VMAT audits. 16,22,[24][25][26]29 In our survey, the acceptable levels of dose discrepancies at the specification points of ±3% for PTV and ±5% for OARS were achieved by the large majority of the 8 centers. However, the TPS dose for the lungs was underestimated by about 6% at 2 centers (C and D); both institutions used RapidArc/Varian/AAA.…”

Section: Discussionmentioning

confidence: 63%

“…[17][18][19][20] In addition, a number of studies in a range of countries have evaluated multi-institutional IMRT/VMAT accuracy using various methodologies. [21][22][23][24][25][26] The reports have emphasized the need for high accuracy levels in the use of these complex technologies in radiation oncology.…”

Section: Introductionmentioning

confidence: 99%

Multi-institutional evaluation using the end-to-end test for implementation of dynamic techniques of radiation therapy in Thailand

Tuntipumiamorn

Tangboonduangjit

Sanghangthum

et al. 2019

Reports of Practical Oncology & Radiotherapy

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Quality assurance Accuracy End-to-end test and the dose distribution from the radiochromic films. The global gamma indices of the measurement doses and the treatment planning system calculation doses were compared. Results: The large majority of the RT centers (6/8) fulfilled the dosimetric goals, with the measured and calculated doses at the specification points agreeing within ±3% for PTV and ±5% for OARS. At 2 centers, TPS underestimated the lung doses by about 6% and spinal cord doses by 8%. The mean percentage gamma pass rates for the 8 centers were 98.29 ± 0.67% (for the 3%/3 mm criterion) and 96.72 ± 0.84% (for the 2%/2 mm criterion). Conclusions: The 8 participating RT centers achieved a satisfactory quality level of IMRT/VMAT clinical implementation.

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“…There are examples of IMRT verification projects [9,[11][12][13][14][15] and several examples of pre-treatment QA performed at hospitals described in the literature [11,[16][17][18]. These audit procedures include dosimetry ranging from point dose measurements, to 2 D dosimetry with films and/or dosimeter arrays to 3 D dosimetry with dosimeter arrays or gel.…”

Section: Introductionmentioning

confidence: 99%

Testing the methodology for a dosimetric end-to-end audit of IMRT/VMAT: results of IAEA multicentre and national studies

et al. 2019

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Introduction: Within an International Atomic Energy Agency (IAEA) coordinated research project (CRP), a remote end-to-end dosimetric quality audit for intensity modulated radiation therapy (IMRT)/ volumetric arc therapy (VMAT) was developed to verify the radiotherapy chain including imaging, treatment planning and dose delivery. The methodology as well as the results obtained in a multicentre pilot study and national trial runs conducted in close cooperation with dosimetry audit networks (DANs) of IAEA Member States are presented. Material and methods: A solid polystyrene phantom containing a dosimetry insert with an irregular solid water planning target volume (PTV) and organ at risk (OAR) was designed for this audit. The insert can be preloaded with radiochromic film and four thermoluminescent dosimeters (TLDs). For the audit, radiotherapy centres were asked to scan the phantom, contour the structures, create an IMRT/VMAT treatment plan and irradiate the phantom. The dose prescription was to deliver 4 Gy to the PTV in two fractions and to limit the OAR dose to a maximum of 2.8 Gy. The TLD measured doses and film measured dose distributions were compared with the TPS calculations. Results: Sixteen hospitals from 13 countries and 64 hospitals from 6 countries participated in the multicenter pilot study and in the national runs, respectively. The TLD results for the PTV were all within ±5% acceptance limit for the multicentre pilot study, whereas for national runs, 17 participants failed to meet this criterion. All measured doses in the OAR were below the treatment planning constraint. The film analysis identified seven plans in national runs below the 90% passing rate gamma criteria. Conclusion: The results proved that the methodology of the IMRT/VMAT dosimetric end-to-end audit was feasible for its intended purpose, i.e., the phantom design and materials were suitable; the phantom was easy to use and it was robust enough for shipment. Most importantly the audit methodology was capable of identifying suboptimal IMRT/VMAT delivery.

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DEMAT: A multi-institutional dosimetry audit of rotational and static intensity-modulated radiotherapy

Cited by 12 publications

References 26 publications

Challenges in calculation of the gamma index in radiotherapy – Towards good practice

Challenges in calculation of the gamma index in radiotherapy – Towards good practice

Multi-institutional evaluation using the end-to-end test for implementation of dynamic techniques of radiation therapy in Thailand

Testing the methodology for a dosimetric end-to-end audit of IMRT/VMAT: results of IAEA multicentre and national studies

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