Estimation of free electron fraction value p for a parallel-plate ionization chamber in high dose per pulse IORT electron beams (341 views)
World Congress On Medical Physics And Biomedical Engineering (ISSN: 1680-07379783642034725), 2009; 25(1): 998-1000.
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Paper type: Conference Paper,
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Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-77950392783&partnerID=40&md5=4fe1d472227416b2104fa7b2eed8d75e
Keywords: Free Electrons, Iort, Parallel Plate Ionization Chamber, Absorbed Dose, Correction Factors, Experimental Data, High Dose-Per-Pulse, High Energy Electron Beams, Intra-Operative, Ion Recombination, Primary Standards, Water Value, Biomedical Engineering, Dosimetry, Electron Optics, Estimation, Ionization Of Liquids, Linear Accelerators, Oncology, Particle Detectors, Physics, Radiation Chemistry, Radiotherapy,
Affiliations:
*** IBB - CNR ***
Istituto di Biostrutture e Bioimmagini, Consiglio Nazionale Delle Ricerche (C.N.R), Via Pansini 5, Napoli, Italy
Dipartimento di Diagnostica Per Immagini e Radioterapia, Università Federico II, Napoli, Italy
References:
(2000) Absorbed Dose Determination in External Beam Radiotherapy: An International Code of Practice for Dosimetry Based on Standards of Absorbed Dose to Water, , International Atomic Energy Agency (IAEA) Technical Reports Series No 39
Boag, J.W., Hochhauser, E., Balk, O.A., The effect of free-electron collection on the recombination correction to ionization measurements of pulsed radiation (1996) Phys. Med. Biol., 41, pp. 885-897
Piermattei, A., Delle Canne, S., Azario, L., The saturation loss for plane parallel ionization chambers at high dose per pulse values (2000) Phys. Med. Biol., 45, pp. 1869-1883
Rosi, A., Viti, V., (2003) Guidelines for Quality Assurance in Intra-operative Radiation Therapy, , Rapporti ISTISAN 03/1 EN
Di Martino, F., Giannelli, M., Traino, A.C., Ion recombination correction for very high dose-per-pulse high-energy electron-beams (2005) Med. Phys., 32, pp. 2204-2210
Boag, J. W., Hochhauser, E., Balk, O. A., The effect of free-electron collection on the recombination correction to ionization measurements of pulsed radiation (1996) Phys. Med. Biol., 41, pp. 885-897
World Congress On Medical Physics And Biomedical Engineering (ISSN: 1680-07379783642034725), 2009; 25(1): 998-1000.
Export to BibTeX Export to EndNote
Paper type: Conference Paper,
Impact factor: 0, 5-year impact factor: 0
Url: http://www.scopus.com/inward/record.url?eid=2-s2.0-77950392783&partnerID=40&md5=4fe1d472227416b2104fa7b2eed8d75e
Keywords: Free Electrons, Iort, Parallel Plate Ionization Chamber, Absorbed Dose, Correction Factors, Experimental Data, High Dose-Per-Pulse, High Energy Electron Beams, Intra-Operative, Ion Recombination, Primary Standards, Water Value, Biomedical Engineering, Dosimetry, Electron Optics, Estimation, Ionization Of Liquids, Linear Accelerators, Oncology, Particle Detectors, Physics, Radiation Chemistry, Radiotherapy,
Affiliations:
*** IBB - CNR ***
Istituto di Biostrutture e Bioimmagini, Consiglio Nazionale Delle Ricerche (C.N.R), Via Pansini 5, Napoli, Italy
Dipartimento di Diagnostica Per Immagini e Radioterapia, Università Federico II, Napoli, Italy
References:
(2000) Absorbed Dose Determination in External Beam Radiotherapy: An International Code of Practice for Dosimetry Based on Standards of Absorbed Dose to Water, , International Atomic Energy Agency (IAEA) Technical Reports Series No 39
Boag, J.W., Hochhauser, E., Balk, O.A., The effect of free-electron collection on the recombination correction to ionization measurements of pulsed radiation (1996) Phys. Med. Biol., 41, pp. 885-897
Piermattei, A., Delle Canne, S., Azario, L., The saturation loss for plane parallel ionization chambers at high dose per pulse values (2000) Phys. Med. Biol., 45, pp. 1869-1883
Rosi, A., Viti, V., (2003) Guidelines for Quality Assurance in Intra-operative Radiation Therapy, , Rapporti ISTISAN 03/1 EN
Di Martino, F., Giannelli, M., Traino, A.C., Ion recombination correction for very high dose-per-pulse high-energy electron-beams (2005) Med. Phys., 32, pp. 2204-2210
Boag, J. W., Hochhauser, E., Balk, O. A., The effect of free-electron collection on the recombination correction to ionization measurements of pulsed radiation (1996) Phys. Med. Biol., 41, pp. 885-897
Estimation of free electron fraction value p for a parallel-plate ionization chamber in high dose per pulse IORT electron beams
Purpose: to verify the extent of equivalence of different Markus ionization chambers and to validate the estimation of free electron fraction value p for parallel ionization chambers in very high dose-per-pulse high-energy electron beams from an intra-operative radiotherapy (IORT) dedicated linear accelerator as proposed in literature. Materials and Methods: dose-to-water values were measured with chemical dosimeters (operated by the Italian Primary Standard Dosimetry Laboratory) and with a parallel-plate ionization chambers (Markus, PTW) in IORT electron beams from a Linac Hitesys Novac7 (Aprilia-Latina, Italy) installed at University "Federico II" of Naples. We determined the ion recombination correction factor (ksat) as a function of dose per pulse for the ionization chamber through the estimation of free electron fraction value (p). Results: The estimate of p from experimental data was p=0.336 ± 0.013 .This result was in good agreement with the value found by Di Martino et al. for the same ionization chamber model. Conclusions: This study confirms that parallel ionization chamber can be employed for IORT absorbed dose-to-water measurements and in principle could allow to avoid the use of the more complex chemical dosimetry. © 2009 Springer-Verlag.
Purpose: to verify the extent of equivalence of different Markus ionization chambers and to validate the estimation of free electron fraction value p for parallel ionization chambers in very high dose-per-pulse high-energy electron beams from an intra-operative radiotherapy (IORT) dedicated linear accelerator as proposed in literature. Materials and Methods: dose-to-water values were measured with chemical dosimeters (operated by the Italian Primary Standard Dosimetry Laboratory) and with a parallel-plate ionization chambers (Markus, PTW) in IORT electron beams from a Linac Hitesys Novac7 (Aprilia-Latina, Italy) installed at University "Federico II" of Naples. We determined the ion recombination correction factor (ksat) as a function of dose per pulse for the ionization chamber through the estimation of free electron fraction value (p). Results: The estimate of p from experimental data was p=0.336 ± 0.013 .This result was in good agreement with the value found by Di Martino et al. for the same ionization chamber model. Conclusions: This study confirms that parallel ionization chamber can be employed for IORT absorbed dose-to-water measurements and in principle could allow to avoid the use of the more complex chemical dosimetry. © 2009 Springer-Verlag.
Estimation of free electron fraction value p for a parallel-plate ionization chamber in high dose per pulse IORT electron beams
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Estimation of free electron fraction value p for a parallel-plate ionization chamber in high dose per pulse IORT electron beams
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