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Bortot D, Mazzucconi D, Fazzi A, Agosteo S, Pola A, Colautti P, Selva A, Conte V. From micro to nanodosimetry with an avalanche-confinement TEPC: Characterization with He-4 and Li-7 ions. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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2
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Fattori S, Petringa G, Agosteo S, Bortot D, Conte V, Cuttone G, Di Fini A, Farokhi F, Mazzucconi D, Pandola L, Petrović I, Ristić-Fira A, Rosenfeld A, Weber U, Cirrone GAP. 4He dose- and track-averaged linear energy transfer: Monte Carlo algorithms and experimental verification. Phys Med Biol 2022; 67. [DOI: 10.1088/1361-6560/ac776f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2022] [Accepted: 06/09/2022] [Indexed: 11/12/2022]
Abstract
Abstract
Objective. In the present hadrontherapy scenario, there is a growing interest in exploring the capabilities of different ion species other than protons and carbons. The possibility of using different ions paves the way for new radiotherapy approaches, such as the multi-ions treatment, where radiation could vary according to target volume, shape, depth and histologic characteristics of the tumor. For these reasons, in this paper, the study and understanding of biological-relevant quantities was extended for the case of 4He ion. Approach. Geant4 Monte Carlo based algorithms for dose- and track-averaged LET (Linear Energy Transfer) calculations, were validated for 4He ions and for the case of a mixed field characterised by the presence of secondary ions from both target and projectile fragmentation. The simulated dose and track averaged LETs were compared with the corresponding dose and frequency mean values of the lineal energy,
y
D
¯
and
y
¯
F
, derived from experimental microdosimetric spectra. Two microdosimetric experimental campaigns were carried out at the Italian eye proton therapy facility of the Laboratori Nazionali del Sud of Istituto Nazionale di Fisica Nucleare (INFN-LNS, Catania, I) using two different microdosimeters: the MicroPlus probe and the nano-TEPC (Tissue Equivalent Proportional Counter). Main results. A good agreement of
L
¯
d
Total
and
L
¯
t
Total
with
y
¯
D
and
y
¯
T
experimentally measured with both microdosimetric detectors MicroPlus and nano-TEPC in two configurations: full energy and modulated 4He ion beam, was found. Significance. The results of this study certify the use of a very effective tool for the precise calculation of LET, given by a Monte Carlo approach which has the advantage of allowing detailed simulation and tracking of nuclear interactions, even in complex clinical scenarios.
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Lillhök J, Billnert-Maróti R, Anastasiadis A. MCNP 6.2 simulations of energy deposition in low-density volumes corresponding to unit-density volumes on the nanometre level. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2022.106831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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4
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Agosteo S. Detectors for measurement of microdosimetric quantities. RADIAT MEAS 2022. [DOI: 10.1016/j.radmeas.2022.106807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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5
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Jahanfar S, Tavakoli-Anbaran H. Resolving the Nonconductivity of Alternative Materials by Using Thin Metal Layers in Neutron Microdosimeter. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2022. [DOI: 10.1007/s13369-022-06724-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Selva A, Bolst D, Guatelli S, Conte V. Energy imparted and ionization yield in nanometre-sized volumes. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2021.109910] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Parisi A, Olko P, Swakon J, Horwacik T, Jablonski H, Malinowski L, Nowak T, Struelens L, Vanhavere F. Microdosimetric characterization of a clinical proton therapy beam: comparison between simulated lineal energy distributions in spherical water targets and experimental measurements with a silicon detector. Phys Med Biol 2021; 67. [PMID: 34933289 DOI: 10.1088/1361-6560/ac4563] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 12/21/2021] [Indexed: 11/12/2022]
Abstract
Objective Treatment planning based on computer simulations were proposed to account for the increase in the relative biological effectiveness (RBE) of proton radiotherapy beams near to the edges of the irradiated volume. Since silicon detectors could be used to validate the results of these simulations, it is important to explore the limitations of this comparison. Approach Microdosimetric measurements with a MicroPlus Bridge V2 silicon detector (thickness = 10 µm) were performed along the Bragg peak of a clinical proton beam. The lineal energy distributions, the dose mean values, and the RBE calculated with a biological weighting function were compared with simulations with PHITS (microdosimetric target = 1 µm water sphere), and published clonogenic survival in vitro RBE data for the V79 cell line. The effect of the silicon-to-water conversion was also investigated by comparing three different methodologies (conversion based on a single value, novel bin-to-bin conversions based on SRIM and PSTAR). Main results Mainly due to differences in the microdosimetric targets, the experimental dose-mean lineal energy and RBE values at the distal edge were respectively up to 53% and 28% lower than the simulated ones. Furthermore, the methodology chosen for the silicon-to-water conversion was proven to affect the dose mean lineal energy and the RBE10 up to 32% and 11% respectively. The best methodology to compensate for this underestimation was the bin-to-bin silicon-to-water conversion based on PSTAR. Significance This work represents the first comparison between PHITS-simulated lineal energy distributions in water targets and corresponding experimental spectra measured with silicon detectors. Furthermore, the effect of the silicon-to-water conversion on the RBE was explored for the first time. The proposed methodology based on the PSTAR bin-to-bin conversion appears to provide superior results with respect to commonly used single scaling factors and is recommended for future studies.
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Affiliation(s)
| | - Pawel Olko
- IFJ PAN, Walerego Eljasza Radzikowskiego 152, Krakow, 31-342, POLAND
| | - Jan Swakon
- IFJ PAN, Walerego Eljasza Radzikowskiego 152, Krakow, 31-342, POLAND
| | - Tomasz Horwacik
- IF PAN, Walerego Eljasza Radzikowskiego 152, Krakow, Kraków, 31-342, POLAND
| | - Hubert Jablonski
- IFJ PAN, Walerego Eljasza Radzikowskiego 152, Krakow, 31-342, POLAND
| | - Leszek Malinowski
- IFJ PAN, Walerego Eljasza Radzikowskiego 152, Krakow, 31-342, POLAND
| | - Tomasz Nowak
- IFJ PAN, Walerego Eljasza Radzikowskiego 152, Krakow, 31-342, POLAND
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Parisi A, Sato T, Matsuya Y, Kase Y, Magrin G, Verona C, Tran L, Rosenfeld A, Bianchi A, Olko P, Struelens L, Vanhavere F. Development of a new microdosimetric biological weighting function for the RBE 10 assessment in case of the V79 cell line exposed to ions from 1H to 238U. Phys Med Biol 2020; 65:235010. [PMID: 33274727 DOI: 10.1088/1361-6560/abbf96] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An improved biological weighting function (IBWF) is proposed to phenomenologically relate microdosimetric lineal energy probability density distributions with the relative biological effectiveness (RBE) for the in vitro clonogenic cell survival (surviving fraction = 10%) of the most commonly used mammalian cell line, i.e. the Chinese hamster lung fibroblasts (V79). The IBWF, intended as a simple and robust tool for a fast RBE assessment to compare different exposure conditions in particle therapy beams, was determined through an iterative global-fitting process aimed to minimize the average relative deviation between RBE calculations and literature in vitro data in case of exposure to various types of ions from 1H to 238U. By using a single particle- and energy- independent function, it was possible to establish an univocal correlation between lineal energy and clonogenic cell survival for particles spanning over an unrestricted linear energy transfer range of almost five orders of magnitude (0.2 keV µm-1 to 15 000 keV µm-1 in liquid water). The average deviation between IBWF-derived RBE values and the published in vitro data was ∼14%. The IBWF results were also compared with corresponding calculations (in vitro RBE10 for the V79 cell line) performed using the modified microdosimetric kinetic model (modified MKM). Furthermore, RBE values computed with the reference biological weighting function (BWF) for the in vivo early intestine tolerance in mice were included for comparison and to further explore potential correlations between the BWF results and the in vitro RBE as reported in previous studies. The results suggest that the modified MKM possess limitations in reproducing the experimental in vitro RBE10 for the V79 cell line in case of ions heavier than 20Ne. Furthermore, due to the different modelled endpoint, marked deviations were found between the RBE values assessed using the reference BWF and the IBWF for ions heavier than 2H. Finally, the IBWF was unchangingly applied to calculate RBE values by processing lineal energy density distributions experimentally measured with eight different microdosimeters in 19 1H and 12C beams at ten different facilities (eight clinical and two research ones). Despite the differences between the detectors, irradiation facilities, beam profiles (pristine or spread out Bragg peak), maximum beam energy, beam delivery (passive or active scanning), energy degradation system (water, PMMA, polyamide or low-density polyethylene), the obtained IBWF-based RBE trends were found to be in good agreement with the corresponding ones in case of computer-simulated microdosimetric spectra (average relative deviation equal to 0.8% and 5.7% for 1H and 12C ions respectively).
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A wall-less Tissue Equivalent Proportional Counter as connecting bridge from microdosimetry to nanodosimetry. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2020.108729] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Bortot D, Mazzucconi D, Pola A, Fazzi A, Pullia M, Savazzi S, Colautti P, Conte V, Agosteo S. A nano-microdosimetric characterization of a therapeutic carbon ion beam at CNAO. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.108674] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Malimban J, Nam UW, Pyo J, Youn S, Ye SJ. Characterization of a new tissue equivalent proportional counter for dosimetry of neutron and photon fields: comparison of measurements and Monte Carlo simulations. Phys Med Biol 2019; 64:17NT02. [PMID: 31269471 DOI: 10.1088/1361-6560/ab2f1f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The tissue equivalent proportional counter (TEPC) is widely recognized as an important dosimetric technique particularly for complex radiation fields. The Korea Astronomy and Space Science Institute (KASI) has recently developed a new spherical TEPC to monitor the space radiation environment in the low earth orbit. The purpose of this study is to examine the performance of the TEPC against standard photon (137Cs) and neutron (252Cf) sources through ground-based measurements and Monte Carlo simulations prior to its actual implementation. Lineal energy distributions, microdosimetric spectra and dosimetric quantities for a 2 µm simulated site in pure propane gas were determined for both sources. Both the measured and calculated 137Cs spectra were shown to occur below 11 keV µm-1 that is the typical range covered by photon sources. Complete coincidence of their electron edge regions was also observed. Meanwhile, the proton edge from the measured 252Cf spectra was found to be in good agreement with those from the simulated ones and the literature. The gamma, recoil proton and heavy ions peaks expected for neutron sources were well defined, albeit deviations in the gamma region. The absorbed dose and dose equivalent for both irradiation conditions were also successfully obtained. The dose equivalent for 252Cf was found to be ten times the absorbed dose whereas it remained the same for 137Cs. The discrepancies observed in the low lineal energy region for both irradiation conditions were caused by intrinsic limitations on the experimental set-up and simulation configurations. This mainly contributed to a difference in the measured and calculated dose mean lineal energies of about 4.1% and 8.7% for the photon and neutron cases, respectively. Nevertheless, fair consistency with published data suggested that our TEPC could adequately reproduce the expected microdosimetric distributions for complex radiation fields.
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Affiliation(s)
- Justin Malimban
- Program in Biomedical Radiation Sciences, Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Republic of Korea
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Mazzucconi D, Bortot D, Agosteo S, Pola A, Pasquato S, Fazzi A, Colautti P, Conte V, Petringa G, Amico A, Cirrone GAP. MICRODOSIMETRY AT NANOMETRIC SCALE WITH AN AVALANCHE-CONFINEMENT TEPC: RESPONSE AGAINST A HELIUM ION BEAM. RADIATION PROTECTION DOSIMETRY 2019; 183:177-181. [PMID: 30535177 DOI: 10.1093/rpd/ncy230] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 11/13/2018] [Indexed: 06/09/2023]
Abstract
The tissue-equivalent proportional counter (TEPC) is the most accurate device for measuring the microdosimetric properties of a particle beam but, since the lower operation limit of common TEPCs is ~0.3 μm, no detailed information on the track structure of the impinging particles can be obtained. The pattern of particle interactions at the nanometric level is measured directly by only three different nanodosimeters worldwide: practical instruments are not yet available. In order to partially fill the gap between microdosimetry and track-nanodosimetry, a low-pressure avalanche-confinement TEPC was designed and constructed for simulating tissue-equivalent sites down to the nanometric region. The present paper aims at describing the response of this TEPC in the range 0.3 μm-25 nm to a 62 MeV/n 4He ion beam. The experimental results, for depths near the Bragg peak, show good agreement with FLUKA simulations and suggest that, for smaller depths, the distribution is highly influenced by secondary electrons.
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Affiliation(s)
- D Mazzucconi
- Politecnico di Milano, Dipartimento di Energia, via La Masa 34, Milano, Italy
- INFN, Sezione di Milano, via Celoria 16, Milano, Italy
| | - D Bortot
- Politecnico di Milano, Dipartimento di Energia, via La Masa 34, Milano, Italy
- INFN, Sezione di Milano, via Celoria 16, Milano, Italy
| | - S Agosteo
- Politecnico di Milano, Dipartimento di Energia, via La Masa 34, Milano, Italy
- INFN, Sezione di Milano, via Celoria 16, Milano, Italy
| | - A Pola
- Politecnico di Milano, Dipartimento di Energia, via La Masa 34, Milano, Italy
- INFN, Sezione di Milano, via Celoria 16, Milano, Italy
| | - S Pasquato
- Politecnico di Milano, Dipartimento di Energia, via La Masa 34, Milano, Italy
- INFN, Sezione di Milano, via Celoria 16, Milano, Italy
| | - A Fazzi
- Politecnico di Milano, Dipartimento di Energia, via La Masa 34, Milano, Italy
- INFN, Sezione di Milano, via Celoria 16, Milano, Italy
| | - P Colautti
- INFN, Laboratori di Legnaro, viale dell'Università 2, Legnaro (Padova), Italy
| | - V Conte
- INFN, Laboratori di Legnaro, viale dell'Università 2, Legnaro (Padova), Italy
| | - G Petringa
- INFN, Laboratori Nazionali del Sud, via Santa Sofia 62, Catania, Italy
| | - A Amico
- INFN, Laboratori Nazionali del Sud, via Santa Sofia 62, Catania, Italy
| | - G A P Cirrone
- INFN, Laboratori Nazionali del Sud, via Santa Sofia 62, Catania, Italy
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14
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Mazzucconi D, Bortot D, Pola A, Agosteo S, Pasquato S, Fazzi A, Colautti P, Conte V. Monte Carlo simulation of a new TEPC for microdosimetry at nanometric level: Response against a carbon ion beam. RADIAT MEAS 2018. [DOI: 10.1016/j.radmeas.2018.03.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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