Auxiliary collimating device for obtaining irradiation fields of any shape for high energy radiotherapy apparatus
AssigneeC.G.R. MeV
InventorsPierre Piret, Hubert Fraikin, Armand Hubert
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Abstract
An auxiliary collimator is added to the main collimator of a radiotherapy apparatus and comprises a master-container filled with mercury and a localising container containing a block of non absorbent material having a predetermined shape; means being provided for automatically positioning these containers with respect to the main collimator and for allowing the mercury to enter the localising container when once it has taken its working position.
Claims4
An auxiliary collimating device for obtaining irradiation fields of any shape for irradiation apparatus provided with a source of highenergy particles and a main collimator, said auxiliary collimating device comprising a first container, termed a master container, and a second container, termed a localising container, said containers being integral with a chassis movable along guide rails;
- said containers being interconnected by a flexible pipe;
- said master container being, in a position of rest, filled with mercury ;
- said localising container containing a block of expanded polystyrene of predetermined shape;
- said block having lateral walls converging toward said source of particles;
- the block having cross-section the dimensions of which are homothetic to the dimensions of the field to be irradiated midway of the depth of the volume to be treated.
Dependencies are inferred from the claim text.