PROBLEM TO BE SOLVED: To provide a corpuscular beam therapeutic unit for forming a high-contrast field.SOLUTION: The corpuscular beam therapeutic unit comprises an irradiation nozzle 1 to irradiate a particle beam by scanning with two electromagnets which have scanning directions different from each other, and a multi-leaf collimator 5 to restrict or to form an irradiation field of a charged particle beam so as to be matched with a shape of an irradiation object. The multi-leaf collimator comprises a leaf line 5C with a plurality of leaf plates 5L arranged in a thickness direction such that one edge faces EL of the leaf plates are aligned, and a leaf plate drive mechanism 5D for driving the one edge faces EL in a direction approaching to or leaving from a beam axis XB relative to each of the plurality of leaf plates 5L. The particle beam is irradiated by a scanning method.COPYRIGHT: (C)2015,JPO&INPIT【課題】コントラストの高い照射野が形成できる粒子線治療装置を得ることを目的とする。【解決手段】粒子ビームを走査方向が異なる2つの電磁石で走査して照射する照射ノズル1と、複数のリーフ板5Lの一端面ELを揃えて厚み方向に並べたリーフ列5Cと、複数のリーフ板5Lのそれぞれに対して、一端面ELをビーム軸XBに対して接近または離反方向に駆動させるリーフ板駆動機構5Dと、を有し、照射対象の形状に適合するように電粒子ビームの照射野を制限若しくは成形するためのマルチリーフコリメータ5と、を備え、粒子ビームは、スキャニング法により照射される。【選択図】図1
