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• W3134955350 abstract "The article describes the proposed new multifunctional ionization chamber (MIC) designed to measure dose profiles when the medical accelerator Prometheus is operating in the scanning pencil beam mode. A digital image acquisition detector (DIDE) with a tissue-equivalent water phantom is used to calibrate the accelerator before a radiation therapy session. The application of the CPPI on the beam of a proton accelerator operating in the mode of beam splitting into spots with a scanning beam is considered. The CDPI detector allows for a few accelerator pulses in on-line mode to see how the energy release of each spot is distributed over the area of the irradiated target, which is the actual calibration of the accelerator before the proton therapy session. During the proton therapy session, it is planned to install the MIC directly in front of the patient. The MIC chamber contains two ionization chambers operating simultaneously — a pad chamber (PC) operating on gas or warm liquid and a strip ionization chamber operating only on gas (SC). At the accelerator Prometheus it is proposed to use a MIC, which will be used in the mode of operation by the method of active scanning with a pencil proton beam. The use of the MIC operation is intended to control the density of the beam intensity during the irradiation of the target in the patient during the proton therapy session. In case of violation of the planned operating mode of the accelerator and the beam goes beyond the parameters preset before the session, the deviation detection control system (SDMS) will turn off the accelerator. The device of the readout electronics (SE) of the MIC and SKOO cameras is described. This proposed detector, including the MIC and SKOO camera and the reading electronics serving it, will improve the quality of the therapeutic beam supply, due to the accurate determination of the absorbed dose density supplied by the scanning beam to each spot of the irradiated target, and therefore the generated high dose distribution field will correspond to the irradiated volume of the patient and will increase the safety and control of patient exposure to the target. The PC included in the MIC is designed on a warm liquid (or gas) and is a high-precision ionization chamber with coordinate sensitivity over the width of the irradiated target. The SC included in the MIC operates on gas and controls the direction of the incident beam to a given spot in the target. A version of the charge-sensitive preamplifier (QCD) and the SE system designed for experimental verification of the MIC prototype has been developed. The SCOO circuit working in conjunction with the MIC camera allows you to control the predetermined parameters of the irradiation of the patient's target boundaries and turns off the accelerator if these parameters deviate from the initially specified ones." @default.
• W3134955350 created "2021-03-15" @default.
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• W3134955350 date "2020-11-10" @default.
• W3134955350 modified "2023-09-27" @default.
• W3134955350 title "Multifunctional ionization chamber and its electronic path for use on the medical accelerator Prometeus" @default.
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• W3134955350 doi "https://doi.org/10.17073/1609-3577-2020-3-229-240" @default.
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