A micro-pattern gaseous detector for beam monitoring in ion-therapy

Terakawa, A.; Ishii, K.; Matsuyama, S.; Kikuchi, Y.; Togashi, Takuya; Arikawa, J.; Yamashita, Wataru; Takahashi, Yusuke; Fujishiro, Fumito; Yamazaki, H.; Sakemi, Y.

doi:10.1016/j.nimb.2015.09.023

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…Recently, gas electron multiplier (GEM) technology has been used to develop a new type of gas detector system with excellent spatial resolution and stable operation at higher counting rates. The basic idea is to introduce a GEM foil in the sensitive volume to multiply the electrons induced by the incident charged‐particle beam as shown in Fig.…”

Section: Detectors For Beam Monitoringmentioning

confidence: 99%

Dose detectors, sensors, and their applications

Giordanengo

2018

Medical Physics

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This article is intended to present the different types of particle and radiation detectors available for applications in particle therapy. Several types of detectors and sensors exist for measurements of absorbed dose in reference and nonreference conditions and the ones in use for beam monitoring. Therefore, this manuscript focuses on the following applications: (a) primary methods for dosimetry in ion beams, (b) measurements of absorbed dose in realistic patient‐specific scenarios with different dose delivery configurations, and (c) beam monitoring. Water and graphite calorimeters, Faraday cups, ionization based gas detectors are described first, followed by the description of the protocols for proton and ion dosimetry. Then films, scintillator and solid‐state detectors are reviewed. Finally, several types of ionization chambers (large, pinpoint, arrays of chambers arranged in regular 1D or 2D pattern, parallel‐plate configuration with large integral electrodes or with anode segmented in strips or pixels, multi‐wire, and the multi‐gap prototype) have been considered. New beam monitors to deal with a wide range of intensity and pulsed beams expected from new accelerators, different dose fractionation and advanced delivery techniques are presented. The existing detectors available for particle therapy have been described taking into account the different requirements for devices used in reference and nonreference conditions and the ones designed for beam monitoring.

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Section: Detectors For Beam Monitoringmentioning

confidence: 99%

Dose detectors, sensors, and their applications

Giordanengo

2018

Medical Physics

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“…Different alternative technologies have been investigated to improve the sensitivity, the spatial resolution or the readout speed of conventional gas detectors. Micro-pattern gaseous detectors based on electron multiplier technology (Sauli 1997) allow extending the sensitivity to lower beam currents (Terakawa et al 2015, Altieri et al 2018. Parallel-plate ionization chambers (IC) with electrodes segmented in strips and optimized for high spatio-temporal resolutions were proposed to monitor the beam profile and beam fluence in treatments with protons at high dose rates (Yang et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Performance of LGAD strip detectors for particle counting of therapeutic proton beams

Monaco,

Ali,

Bersani

et al. 2023

Phys. Med. Biol.

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Objective: The performance of silicon detectors with moderate internal gain, named Low-Gain Avalanche Diodes (LGADs), was studied to investigate their capability to discriminate and count single beam particles at high fluxes, in view of future applications for beam characterization and on-line beam monitoring in proton therapy.Approach: Dedicated LGAD detectors with an active thickness of 55 μm and segmented in 2 mm2 strips were characterized at two Italian proton-therapy facilities, CNAO in Pavia and the Proton Therapy Center of Trento, with proton beams provided by a synchrotron and a cyclotron, respectively. Signals from single beam particles were discriminated against a threshold and counted. The number of proton pulses for fixed energies and different particle fluxes was compared with the charge collected by a compact ionization chamber, to infer the input particle rates.Main results: The counting inefficiency due to the overlap of nearby signals was less than 1 % up to particle rates in one strip of 1 MHz, corresponding to a mean fluence rate on the strip of about 5⸱107 p/(cm2⸱s). Count-loss correction algorithms based on the logic combination of signals from two neighboring strips allow to extend the maximum counting rate by one order of magnitude. The same algorithms give additional information on the fine time structure of the beam. Significance. The direct counting of the number of beam protons with segmented silicon detectors allows to overcome some limitations of gas detectors typically employed for beam characterization and beam monitoring in particle therapy, providing faster response times, higher sensitivity, and independence of the counts from the particle energy. 

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Prototype development of the beam diagnostic system of a proton therapy facility based on a superconducting cyclotron

Chen

Liu

et al. 2021

Nuclear Instruments and Methods in Physics Research Section A:

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A micro-pattern gaseous detector for beam monitoring in ion-therapy

Cited by 3 publications

References 9 publications

Dose detectors, sensors, and their applications

Dose detectors, sensors, and their applications

Performance of LGAD strip detectors for particle counting of therapeutic proton beams

Prototype development of the beam diagnostic system of a proton therapy facility based on a superconducting cyclotron

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