Particle therapy system

A particle therapy system comprising a charged particle beam generation apparatus and a charged particle beam irradiation apparatus for irradiating a charged particle beam generated by said charged particle beam generation apparatus to an irradiation target,

• wherein said charged particle beam irradiation apparatus comprises a collimator for passing a part of the charged particle beam therethrough, and an energy measuring device including a charged particle beam entrance portion disposed upstream of said collimator to receive at least a part of the remaining charged particle beam, for measuring energy of the charged particle beam having entered said charged particle beam entrance portion, and
• wherein said charged particle beam entrance portion comprises a plurality of metallic sheets arranged side by side in a direction of advance of the charged particle beam and generating electric charges with incidence of the charged particle beam, and said energy measuring device measures the energy of the charged particle beam based on a position at which the metallic sheet having generated a maximum amount of electric charges is arranged.

A charged particle beam irradiation apparatus, for irradiating a charged particle beam generated by a charged particle beam generation apparatus to an irradiation target,

• wherein said charged particle beam irradiation apparatus comprises a collimator for passing a part of the charged particle beam therethrough, and an energy measuring device including a charged particle beam entrance portion disposed upstream of said collimator to receive at least a part of the remaining charged particle beam having entered said charged particle beam entrance portion,
• wherein said energy measuring device measures the energy of the charged particle beam based on a position at which electric charges generate in maximum amount with incidence of the charged particle beam upon said charged particle beam entrance portion.

A charged particle beam irradiation apparatus, for irradiating a charged particle beam generated by a charged particle beam generation apparatus to an irradiation target,

• wherein said charged particle beam irradiation apparatus comprises a collimator for passing a part of the charged particle beam therethrough, and an energy measuring device including a charged particle beam entrance portion disposed upstream of said collimator to receive at least a part of the remaining charged particle beam having entered said charged particle beam entrance portion,
• wherein said charged particle beam entrance portion comprises a plurality of metallic sheets arranged side by side in a direction of advance of the charged particle beam and generating electric charges with incidence of the charged particle beam, and said energy measuring device measures the energy of the charged particle beam based on a position at which the metallic sheet having generated a maximum amount of electric charges is arranged.