The Italian affair: The employment of parallel-plate ionization chambers for dose measurements in high dose-per-pulse IORT electron beams (965 views)
Med Phys (ISSN: 0094-2405, 2473-4209electronic, 0094-2405linking), 2010 Jun; 37(6): 2918-2924.
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Paper type: Journal Article,
Impact factor: 3.075, 5-year impact factor: 3.267
Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-77953504764&partnerID=40&md5=bf87d242c3dac2679f706d2a0844ec15
Keywords: Free-Electron Fraction, Ion Recombination, Ionization Chamber, Article, Computer Aided Design, Computer Assisted Radiotherapy, Equipment, Equipment Design, Instrumentation, Italy, Radiation Dose, Radiometry, Reproducibility, Sensitivity And Specificity, Computer-Aided Design, Equipment Failure Analysis, Radiotherapy Dosage, Conformal, Reproducibility Of Results,
Affiliations:
*** IBB - CNR ***
Institute of Biostructures and Bioimages, National Council of Research (CNR), via S. Pansini 5, Naples 80131, Italy
Department of Diagnostic Imaging and Radiation Oncology, University Federico II of Naples, Naples 80131, Italy
References:
Not available.
Med Phys (ISSN: 0094-2405, 2473-4209electronic, 0094-2405linking), 2010 Jun; 37(6): 2918-2924.
Export to BibTeX Export to EndNote
Paper type: Journal Article,
Impact factor: 3.075, 5-year impact factor: 3.267
Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-77953504764&partnerID=40&md5=bf87d242c3dac2679f706d2a0844ec15
Keywords: Free-Electron Fraction, Ion Recombination, Ionization Chamber, Article, Computer Aided Design, Computer Assisted Radiotherapy, Equipment, Equipment Design, Instrumentation, Italy, Radiation Dose, Radiometry, Reproducibility, Sensitivity And Specificity, Computer-Aided Design, Equipment Failure Analysis, Radiotherapy Dosage, Conformal, Reproducibility Of Results,
Affiliations:
*** IBB - CNR ***
Institute of Biostructures and Bioimages, National Council of Research (CNR), via S. Pansini 5, Naples 80131, Italy
Department of Diagnostic Imaging and Radiation Oncology, University Federico II of Naples, Naples 80131, Italy
References:
Not available.
The Italian affair: The employment of parallel-plate ionization chambers for dose measurements in high dose-per-pulse IORT electron beams
Purpose: At the high dose-per-pulse rates used by some intraoperative radiotherapy (IORT) units, the employment of ionization chambers for dose measurements needs an appropriate correction (ksat) for ion recombination. Through a revision of the existing literature, the authors compared different methods for the determination of the recombination correction factor and their impact on clinical dosimetry. Methods: A dosimetric characterization of IORT electron beams from a Linac Hitesys Novac7 (Aprilia-Latina, Italy) was performed. Dose-to-water (Dw) values were measured with dose-per-pulse independent chemical dosimeters (operated by the Italian Primary Standard Dosimetry Laboratory, ENEA) and compared to doses obtained by two different parallel-plate ionization chamber models (Markus and Advanced Markus, PTW, Freiburg, Germany). For dose measurements using ionization chambers, the authors applied two different methods for the determination of the ion recombination correction factor (ksat), as suggested in previous articles. The first method is based on the experimental estimation of the free-electron fraction values p; the second one is based on the "nonstandard" two-voltage analysis including the free-electron component. Results: For a Markus type chamber, there is a good agreement between the results on ksat and those reported in the literature for both methods, while for the Advanced Markus chamber, no data are available for comparison. Conclusions: Comparing values of Dw obtained by dose-per-pulse independent dosimeters and by ionization chambers measurements corrected using the two different approaches, the authors can conclude that the ksat factor determination is very critical and that only an experimental protocol using ionization chamber intercalibration can be considered reliable. © 2010 American Association of Physicists in Medicine.
Purpose: At the high dose-per-pulse rates used by some intraoperative radiotherapy (IORT) units, the employment of ionization chambers for dose measurements needs an appropriate correction (ksat) for ion recombination. Through a revision of the existing literature, the authors compared different methods for the determination of the recombination correction factor and their impact on clinical dosimetry. Methods: A dosimetric characterization of IORT electron beams from a Linac Hitesys Novac7 (Aprilia-Latina, Italy) was performed. Dose-to-water (Dw) values were measured with dose-per-pulse independent chemical dosimeters (operated by the Italian Primary Standard Dosimetry Laboratory, ENEA) and compared to doses obtained by two different parallel-plate ionization chamber models (Markus and Advanced Markus, PTW, Freiburg, Germany). For dose measurements using ionization chambers, the authors applied two different methods for the determination of the ion recombination correction factor (ksat), as suggested in previous articles. The first method is based on the experimental estimation of the free-electron fraction values p; the second one is based on the "nonstandard" two-voltage analysis including the free-electron component. Results: For a Markus type chamber, there is a good agreement between the results on ksat and those reported in the literature for both methods, while for the Advanced Markus chamber, no data are available for comparison. Conclusions: Comparing values of Dw obtained by dose-per-pulse independent dosimeters and by ionization chambers measurements corrected using the two different approaches, the authors can conclude that the ksat factor determination is very critical and that only an experimental protocol using ionization chamber intercalibration can be considered reliable. © 2010 American Association of Physicists in Medicine.
The Italian affair: The employment of parallel-plate ionization chambers for dose measurements in high dose-per-pulse IORT electron beams
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The Italian affair: The employment of parallel-plate ionization chambers for dose measurements in high dose-per-pulse IORT electron beams
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14 Records (12 excluding Abstracts).
Total impact factor: 35.49 (34.38 excluding Abstracts).
Total 5 year impact factor: 37.976 (36.702 excluding Abstracts).
Total impact factor: 35.49 (34.38 excluding Abstracts).
Total 5 year impact factor: 37.976 (36.702 excluding Abstracts).
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