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On the use of solid 133Ba sources as surrogate for liquid 131I in SPECT/CT calibration: a European multi-centre evaluation

J. Tran-Gia, AM. Denis-Bacelar, KM. Ferreira, AP. Robinson, C. Bobin, LM. Bonney, N. Calvert, SM. Collins, AJ. Fenwick, D. Finocchiaro, F. Fioroni, K. Giannopoulou, E. Grassi, W. Heetun, SJ. Jewitt, M. Kotzasarlidou, M. Ljungberg, V. Lourenço,...

. 2023 ; 10 (1) : 73. [pub] 20231123

Status neindexováno Jazyk angličtina Země Německo

Typ dokumentu časopisecké články

Perzistentní odkaz   https://www.medvik.cz/link/bmc23022465

Grantová podpora
15HLT06 MRTDosimetry European Metrology Programme for Innovation and Research
19SIP01 PINICAL-MRT European Metrology Programme for Innovation and Research

INTRODUCTION: Commissioning, calibration, and quality control procedures for nuclear medicine imaging systems are typically performed using hollow containers filled with radionuclide solutions. This leads to multiple sources of uncertainty, many of which can be overcome by using traceable, sealed, long-lived surrogate sources containing a radionuclide of comparable energies and emission probabilities. This study presents the results of a quantitative SPECT/CT imaging comparison exercise performed within the MRTDosimetry consortium to assess the feasibility of using 133Ba as a surrogate for 131I imaging. MATERIALS AND METHODS: Two sets of four traceable 133Ba sources were produced at two National Metrology Institutes and encapsulated in 3D-printed cylinders (volume range 1.68-107.4 mL). Corresponding hollow cylinders to be filled with liquid 131I and a mounting baseplate for repeatable positioning within a Jaszczak phantom were also produced. A quantitative SPECT/CT imaging comparison exercise was conducted between seven members of the consortium (eight SPECT/CT systems from two major vendors) based on a standardised protocol. Each site had to perform three measurements with the two sets of 133Ba sources and liquid 131I. RESULTS: As anticipated, the 131I pseudo-image calibration factors (cps/MBq) were higher than those for 133Ba for all reconstructions and systems. A site-specific cross-calibration reduced the performance differences between both radionuclides with respect to a cross-calibration based on the ratio of emission probabilities from a median of 12-1.5%. The site-specific cross-calibration method also showed agreement between 133Ba and 131I for all cylinder volumes, which highlights the potential use of 133Ba sources to calculate recovery coefficients for partial volume correction. CONCLUSION: This comparison exercise demonstrated that traceable solid 133Ba sources can be used as surrogate for liquid 131I imaging. The use of solid surrogate sources could solve the radiation protection problem inherent in the preparation of phantoms with 131I liquid activity solutions as well as reduce the measurement uncertainties in the activity. This is particularly relevant for stability measurements, which have to be carried out at regular intervals.

Citace poskytuje Crossref.org

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$a On the use of solid 133Ba sources as surrogate for liquid 131I in SPECT/CT calibration: a European multi-centre evaluation / $c J. Tran-Gia, AM. Denis-Bacelar, KM. Ferreira, AP. Robinson, C. Bobin, LM. Bonney, N. Calvert, SM. Collins, AJ. Fenwick, D. Finocchiaro, F. Fioroni, K. Giannopoulou, E. Grassi, W. Heetun, SJ. Jewitt, M. Kotzasarlidou, M. Ljungberg, V. Lourenço, DR. McGowan, J. Mewburn-Crook, B. Sabot, J. Scuffham, K. Sjögreen Gleisner, J. Solc, C. Thiam, J. Tipping, J. Wevrett, MRT Dosimetry Collaboration, M. Lassmann
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$a INTRODUCTION: Commissioning, calibration, and quality control procedures for nuclear medicine imaging systems are typically performed using hollow containers filled with radionuclide solutions. This leads to multiple sources of uncertainty, many of which can be overcome by using traceable, sealed, long-lived surrogate sources containing a radionuclide of comparable energies and emission probabilities. This study presents the results of a quantitative SPECT/CT imaging comparison exercise performed within the MRTDosimetry consortium to assess the feasibility of using 133Ba as a surrogate for 131I imaging. MATERIALS AND METHODS: Two sets of four traceable 133Ba sources were produced at two National Metrology Institutes and encapsulated in 3D-printed cylinders (volume range 1.68-107.4 mL). Corresponding hollow cylinders to be filled with liquid 131I and a mounting baseplate for repeatable positioning within a Jaszczak phantom were also produced. A quantitative SPECT/CT imaging comparison exercise was conducted between seven members of the consortium (eight SPECT/CT systems from two major vendors) based on a standardised protocol. Each site had to perform three measurements with the two sets of 133Ba sources and liquid 131I. RESULTS: As anticipated, the 131I pseudo-image calibration factors (cps/MBq) were higher than those for 133Ba for all reconstructions and systems. A site-specific cross-calibration reduced the performance differences between both radionuclides with respect to a cross-calibration based on the ratio of emission probabilities from a median of 12-1.5%. The site-specific cross-calibration method also showed agreement between 133Ba and 131I for all cylinder volumes, which highlights the potential use of 133Ba sources to calculate recovery coefficients for partial volume correction. CONCLUSION: This comparison exercise demonstrated that traceable solid 133Ba sources can be used as surrogate for liquid 131I imaging. The use of solid surrogate sources could solve the radiation protection problem inherent in the preparation of phantoms with 131I liquid activity solutions as well as reduce the measurement uncertainties in the activity. This is particularly relevant for stability measurements, which have to be carried out at regular intervals.
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$a Robinson, Andrew P $u National Physical Laboratory, Hampton Road, Teddington, UK
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$a Collins, Sean M $u National Physical Laboratory, Hampton Road, Teddington, UK $u School of Mathematics and Physics, University of Surrey, Guildford, UK
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$a Fenwick, Andrew J $u National Physical Laboratory, Hampton Road, Teddington, UK
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$a Giannopoulou, Katerina $u Nuclear Medicine Department, "THEAGENIO" Anticancer Hospital, Thessaloniki, Greece
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$a Grassi, Elisa $u Medical Physics Unit, Azienda USL-IRCCS Di Reggio Emilia, Reggio Emilia, Italy
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$a Heetun, Warda $u National Physical Laboratory, Hampton Road, Teddington, UK
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$a Jewitt, Stephanie J $u Department of Medical Physics and Clinical Engineering, Churchill Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
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$a Kotzasarlidou, Maria $u Nuclear Medicine Department, "THEAGENIO" Anticancer Hospital, Thessaloniki, Greece
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$a Ljungberg, Michael $u Medical Radiation Physics, Lund, Lund University, Lund, Sweden
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$a Lourenço, Valérie $u Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), 91120, Palaiseau, France
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$a McGowan, Daniel R $u Department of Medical Physics and Clinical Engineering, Churchill Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford, UK $u Department of Oncology, University of Oxford, Oxford, UK
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$a Mewburn-Crook, Jamie $u National Physical Laboratory, Hampton Road, Teddington, UK
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$a Sabot, Benoit $u Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), 91120, Palaiseau, France
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$a Scuffham, James $u Royal Surrey County Hospital, Royal Surrey NHS Foundation Trust, Guildford, UK
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$a Thiam, Cheick $u Université Paris-Saclay, CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), 91120, Palaiseau, France
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$a Tipping, Jill $u Department of Medical Physics and Clinical Engineering, Churchill Hospital, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
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$a Wevrett, Jill $u Royal Surrey County Hospital, Royal Surrey NHS Foundation Trust, Guildford, UK
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$a Lassmann, Michael $u Department of Nuclear Medicine, University Hospital Würzburg, Oberdürrbacher Str. 6, 97080, Würzburg, Germany
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