External audits of electron beams using mailed TLD dosimetry: preliminary results

Gomola, Igor; Dam, J. Van; Isern-Verdum, Josep; Verstraete, J.; Reymen, R.; Dutreix, A.; Davis, B.; Huyskens, D.

doi:10.1016/s0167-8140(00)00265-6

Cited by 16 publications

(13 citation statements)

References 13 publications

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“…In total 300 (91.5%) out of 328 beams were found to be within the tolerance level of 5% [12]. Currently only 0.7% of all the electron beams were found to be out of this range.…”

Section: Discussionmentioning

confidence: 99%

Beam Output Audit results within the EORTC Radiation Oncology Group network

et al. 2016

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Beam Output Auditing (BOA) is one key process of the EORTC radiation therapy quality assurance program. Here the results obtained between 2005 and 2014 are presented and compared to previous results.For all BOA reports the following parameters were scored: centre, country, date of audit, beam energies and treatment machines audited, auditing organisation, percentage of agreement between stated and measured dose.Four-hundred and sixty-one BOA reports were analyzed containing the results of 1790 photon and 1366 electron beams, delivered by 755 different treatment machines. The majority of beams (91.1%) were within the optimal limit of ≤ 3%. Only 13 beams (0.4%; n = 9 electrons; n = 4 photons), were out of the range of acceptance of ≤ 5%. Previous reviews reported a much higher percentage of 2.5% or more of the BOAs with >5% deviation.The majority of EORTC centres present beam output variations within the 3% tolerance cutoff value and only 0.4% of audited beams presented with variations of more than 5%. This is an important improvement compared to previous BOA results.

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“…In total 300 (91.5%) out of 328 beams were found to be within the tolerance level of 5% [12]. Currently only 0.7% of all the electron beams were found to be out of this range.…”

Section: Discussionmentioning

confidence: 99%

Beam Output Audit results within the EORTC Radiation Oncology Group network

et al. 2016

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“…Application of TLD chips for radiation dosimetry in both external beam and brachytherapy fields have been demonstrated by various investigators. [12][13][14][15][16] Equation ͑1͒ was used to calculate the absorbed dose rate from the TLD responses for each point irradiated in the phantom: 12…”

Section: Tld Technique and Phantom Designmentioning

confidence: 99%

Dosimetric characteristics of a newly designed grid block for megavoltage photon radiation and its therapeutic advantage using a linear quadratic model

et al. 2006

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Grid radiation therapy with megavoltage x-ray beam has been proven to be an effective technique for management of large, bulky malignant tumors. The clinical advantage of GRID therapy, combined with conventional radiation therapy, has been demonstrated using a prototype GRID block [Mohiuddin, Curtis, Grizos, and Komarnicky, Cancer 66, 114-118 (1990)]. Recently, a new GRID block design with improved dosimetric properties has become commercially available from Radiation Product Design, Inc. (Albertive, MN). This GRID collimator consists of an array of focused apertures in a cerrobend block arranged in a hexagonal pattern having a circular cross-section with a diameter and center-to-center spacing of 14.3 and 21.1 mm, respectively, in the plane of isocenter. In this project, dosimetric characteristics of the newly redesigned GRID block have been investigated for a Varian 21EX linear accelerator (Varian Associates, Palo Alto, CA). These determinations were performed using radiographic films, thermoluminescent dosimeters in Solid Water phantom materials, and an ionization chamber in water. The output factor, percentage depth dose, beam profiles, and isodose distributions of the GRID radiation as a function of field size and beam energy have been measured using both 6 and 18 MV x-ray beams. In addition, the therapeutic advantage obtained from this treatment modality with the new GRID block design for a high, single fraction of dose has been calculated using the linear quadratic model with alpha/beta ratios for typical tumor and normal cells. These biological characteristics of the new GRID block design will also be presented.

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“…The IAEA/WHO, EqualEstro, and the RPC have all detailed their audit programs. [7][8][9][10][11][12][13][14][15][16] This wealth of experience and knowledge in large scale dosimetry programs has allowed the ACDS to develop a strong foundation by building upon existing techniques and methodologies. In particular, the RPC's well established OSLD based audit program was heavily replicated to achieve international uniformity and build upon a wellestablished methodology.…”

Section: Introductionmentioning

confidence: 99%

Remote auditing of radiotherapy facilities using optically stimulated luminescence dosimeters

Lye¹,

Dunn²,

Kenny³

et al. 2014

Medical Physics

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The calculated standard uncertainty of 1.3% at one standard deviation is consistent with the measured standard deviation of 1.4% from the audits and confirming the suitability of the uncertainty budget derived audit tolerances. The OSLD audit shows greater accuracy than the previous TLD audit, justifying the reduction in audit tolerances. In the TLD audit, all outcomes were Pass (Optimal Level) suggesting that the tolerances were too conservative. In the OSLD audit 94% of the audits have resulted in Pass (Optimal level) and 6% of the audits have resulted in Pass (Action Level). All Pass (Action level) results have been resolved with a repeat OSLD audit, or an on-site ion chamber measurement.

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External audits of electron beams using mailed TLD dosimetry: preliminary results

Cited by 16 publications

References 13 publications

Beam Output Audit results within the EORTC Radiation Oncology Group network

Beam Output Audit results within the EORTC Radiation Oncology Group network

Dosimetric characteristics of a newly designed grid block for megavoltage photon radiation and its therapeutic advantage using a linear quadratic model

Remote auditing of radiotherapy facilities using optically stimulated luminescence dosimeters

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