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De Saint-Hubert M, De Angelis C, Knežević Ž, Michalec B, Reniers B, Pyszka E, Stolarczyk L, Swakon J, Foltynska G, Wochnik A, Parisi A, Majer M, Harrison RM, Kopec R, Vanhavere F, Olko P. Characterization of passive dosimeters in proton pencil beam scanning - A EURADOS intercomparison for mailed dosimetry audits in proton therapy centres. Phys Med 2021; 82:134-143. [PMID: 33611050 DOI: 10.1016/j.ejmp.2021.01.073] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 12/18/2020] [Accepted: 01/15/2021] [Indexed: 11/27/2022] Open
Abstract
The lack of mailed dosimetry audits of proton therapy centres in Europe has encouraged researchers of EURADOS Working Group 9 (WG9) to compare response of several existing passive detector systems in therapeutic pencil beam scanning. Alanine Electron Paramagnetic Resonance dosimetry systems from 3 different institutes (ISS, Italy; UH, Belgium and IFJ PAN, Poland), natLiF:Mg, Ti (MTS-N) and natLiF:Mg, Cu, P (MCP-N) thermoluminescent dosimeters (TLDs), GD-352M radiophotoluminescent glass dosimeters (RPLGDs) and Al2O3:C optically stimulated dosimeters (OSLDs) were evaluate. Dosimeter repeatability, batch reproducibility and response in therapeutic Pencil Beam Scanning were verified for implementation as mail auditing system. Alanine detectors demonstrated the lowest linear energy transfer (LET) dependence with an agreement between measured and treatment planning system (TPS) dose below 1%. The OSLDs measured on average a 6.3% lower dose compared to TPS calculation, with no significant difference between varying modulations and ranges. Both GD-352M and MCP-N measured a lower dose than the TPS and luminescent response was dependent on the LET of the therapeutic proton beam. Thermoluminescent response of MTS-N was also found to be dependent on the LET and a higher dose than TPS was measured with the most pronounced increase of 11%. As alanine detectors are characterized by the lowest energy dependence for different parameters of therapeutic pencil beam scanning they are suitable candidates for mail auditing in proton therapy. The response of luminescence detector systems have shown promises even though more careful calibration and corrections are needed for its implementation as part of a mailed dosimetry audit system.
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Affiliation(s)
- M De Saint-Hubert
- Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, BE-2400 Mol, Belgium.
| | - C De Angelis
- Istituto Superiore di Sanità (ISS), Viale Regina Elena 299, 00161 Rome, Italy
| | - Ž Knežević
- Ruđer Bošković Institute (RBI), Bijenička 54, Zagreb, Croatia
| | - B Michalec
- Institute of Nuclear Physics Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31-342 Krakow, Poland
| | - B Reniers
- Research Group NuTeC, University Hasselt (UH), Agoralaan Gebouw H, B-3590 Diepenbeek, Belgium
| | - E Pyszka
- Institute of Nuclear Physics Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31-342 Krakow, Poland
| | - L Stolarczyk
- Institute of Nuclear Physics Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31-342 Krakow, Poland
| | - J Swakon
- Institute of Nuclear Physics Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31-342 Krakow, Poland
| | - G Foltynska
- Institute of Nuclear Physics Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31-342 Krakow, Poland
| | - A Wochnik
- Institute of Nuclear Physics Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31-342 Krakow, Poland
| | - A Parisi
- Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, BE-2400 Mol, Belgium
| | - M Majer
- Ruđer Bošković Institute (RBI), Bijenička 54, Zagreb, Croatia
| | - R M Harrison
- University of Newcastle, Newcastle Upon Tyne NE2 4HH, UK
| | - R Kopec
- Institute of Nuclear Physics Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31-342 Krakow, Poland
| | - F Vanhavere
- Belgian Nuclear Research Centre (SCK CEN), Boeretang 200, BE-2400 Mol, Belgium
| | - P Olko
- Institute of Nuclear Physics Polish Academy of Sciences (IFJ PAN), Radzikowskiego 152, 31-342 Krakow, Poland
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Parisi A, Olko P, Swakoń J, Horwacik T, Jabłoński H, Malinowski L, Nowak T, Struelens L, Vanhavere F. Modeling the radiation-induced cell death in a therapeutic proton beam using thermoluminescent detectors and radiation transport simulations. ACTA ACUST UNITED AC 2020; 65:015008. [DOI: 10.1088/1361-6560/ab491f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Kunst J, Kopeć R, Kukołowicz P, Mojżeszek N, Sadowski B, Stolarczyk L, Ślusarczyk-Kacprzyk W, Toboła A, Olko P. Mailed dosimetric audit of therapeutic proton beams using thermoluminescence MTS-N (LiF:Mg,Ti) powder – First results. RADIAT MEAS 2017. [DOI: 10.1016/j.radmeas.2017.03.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Casey KE, Alvarez P, Kry SF, Howell RM, Lawyer A, Followill D. Development and implementation of a remote audit tool for high dose rate (HDR) Ir-192 brachytherapy using optically stimulated luminescence dosimetry. Med Phys 2014; 40:112102. [PMID: 24320455 DOI: 10.1118/1.4824915] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE The aim of this work was to create a mailable phantom with measurement accuracy suitable for Radiological Physics Center (RPC) audits of high dose-rate (HDR) brachytherapy sources at institutions participating in National Cancer Institute-funded cooperative clinical trials. Optically stimulated luminescence dosimeters (OSLDs) were chosen as the dosimeter to be used with the phantom. METHODS The authors designed and built an 8 × 8 × 10 cm(3) prototype phantom that had two slots capable of holding Al2O3:C OSLDs (nanoDots; Landauer, Glenwood, IL) and a single channel capable of accepting all (192)Ir HDR brachytherapy sources in current clinical use in the United States. The authors irradiated the phantom with Nucletron and Varian (192)Ir HDR sources in order to determine correction factors for linearity with dose and the combined effects of irradiation energy and phantom characteristics. The phantom was then sent to eight institutions which volunteered to perform trial remote audits. RESULTS The linearity correction factor was kL = (-9.43 × 10(-5) × dose) + 1.009, where dose is in cGy, which differed from that determined by the RPC for the same batch of dosimeters using (60)Co irradiation. Separate block correction factors were determined for current versions of both Nucletron and Varian (192)Ir HDR sources and these vendor-specific correction factors differed by almost 2.6%. For the Nucletron source, the correction factor was 1.026 [95% confidence interval (CI) = 1.023-1.028], and for the Varian source, it was 1.000 (95% CI = 0.995-1.005). Variations in lateral source positioning up to 0.8 mm and distal∕proximal source positioning up to 10 mm had minimal effect on dose measurement accuracy. The overall dose measurement uncertainty of the system was estimated to be 2.4% and 2.5% for the Nucletron and Varian sources, respectively (95% CI). This uncertainty was sufficient to establish a ± 5% acceptance criterion for source strength audits under a formal RPC audit program. Trial audits of four Nucletron sources and four Varian sources revealed an average RPC-to-institution dose ratio of 1.000 (standard deviation = 0.011). CONCLUSIONS The authors have created an OSLD-based (192)Ir HDR brachytherapy source remote audit tool which offers sufficient dose measurement accuracy to allow the RPC to establish a remote audit program with a ± 5% acceptance criterion. The feasibility of the system has been demonstrated with eight trial audits to date.
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Affiliation(s)
- Kevin E Casey
- Department of Radiation Physics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030 and The University of Texas Graduate School of Biomedical Sciences at Houston, Houston, Texas 77030
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