Hitachi, Ltd.

Tomohisa Iwamoto

Kunio Moriyama

Masahiro Tadokoro

Yoshihito Hori

Hideaki Nishiuchi

Hideaki Nihongi

Takayoshi Matsushita

A charged particle beam irradiation system in which the energy, Bragg peak, and irradiation depth of a charged particle beam, with which a patient is to be irradiated, can be checked in real time just before actual irradiation. Just before the actual irradiation, by providing a high-speed steering magnet with 100% current, a checking beam is intentionally hit into a beam damper. By using a dosimeter and a dose measuring device in front thereof, extraction beam intensity is measured. By using a multi-layer beam monitor, a dose distribution thereof is measured. Accordingly, just before the actual irradiation, the energy, Bragg peak, and irradiation depth of the charged particle beam, with which the patient is to be irradiated, can be checked accurately and in real time. When the beam has a desired dose distribution as a result of checking, continuously, extraction control is performed.

Charged particle beam irradiation system and operating method of charged particle beam irradiation system

A charge collection electrode is formed of a plurality of groups each of which is made up of a plurality of adjoining wire electrodes. Further, all the wire electrodes are connected to channels of a signal processing device by the same number of lines as the wire electrodes belonging to one group so that each detection signal outputted from one wire electrode selected from each group is inputted through the same line and so that no two adjoining channels are physically continuous in regard to a certain set of consecutive measurement channels. The signal processing device determines group information indicating to which group the wire electrodes that sent the inputted detection signals belong and outputs a processing signal including the group information to a beam monitor controller. The beam monitor controller determines the position and the beam width of the charged particle beam that passed through the wire electrodes.

Beam monitor system and particle beam irradiation system

Disclosed is a beam monitor system in which signals outputted from a plurality of wires are divided in a multi-wire type monitor for measuring a beam profile of a charged particle beam, an identical number of the wires are grouped, the signals of the respective groups are taken out one piece by one piece to be connected with each other, and the number of the pieces, corresponding to a number of the wires belonging to the one group, are put together to be connected to a signal processor storing connection information.

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Tokyo, Japan

Tomohisa Iwamoto