Patent ID: 8487282

Claim:
A particle beam irradiation apparatus comprising: a beam generation portion that generates a particle beam; a beam emission control portion that controls emission of the particle beam; a beam scanning portion that two-dimensionally scans the particle beam; a sensor portion including a plurality of first linear electrodes arranged in parallel in a first direction and a plurality of second linear electrodes arranged in parallel in a second direction orthogonal to the first direction; a beam shape calculation portion that calculates a center of gravity of the particle beam from a first signal output from each of the first linear electrodes and a second signal output from each of the second linear electrodes and that obtains a two-dimensional beam shape of the particle beam around the center of gravity from the first and second signals; a storage portion that accumulates and stores the two-dimensional beam shapes corresponding to the center of gravity across a range of the two-dimensional scan; and a display portion that displays the two-dimensional beam shapes of the range of the two-dimensional scan stored in the storage portion, as a two-dimensional distribution of a particle beam dose.