Patent Number: 058922385
Section: claims

1. A radiation therapy shielding assembly for positioning closely adjacent a patient to be treated, said shield assembly being designed to be used with a radiation beam mechanism that produces a radiation beam for treating a patient, said radiation beam mechanism being designed to move relative to said shield assembly, said radiation therapy shielding assembly comprising first and second generally arcuate shielding sections, each of such sections having a contoured predetermined edge surface, said edge surface of said first and second shielding sections being spaced from one another to define a variable predetermined treatment area adjacent the patient whereby the edge surfaces of said first and second shielding sections control the shape of said radiation beam that contacts said patient as said radiation beam mechanism moves relative to said shielding assembly. 2. A radiation therapy shielding assembly, according to claim 1, wherein said arcuate shielding sections define a patient receiving cavity. 3. A radiation therapy shielding assembly, according to claim 1, wherein said arcuate shielding sections are formed from a lead composition. 4. A radiation therapy shielding apparatus, according to claim 1, including an attachment arm extending between said first and second generally arcuate shielding sections. 5. A radiation therapy shielding apparatus, according to claim 4, wherein said attachment arm is longitudinally adjustable to adjust the spacing between said first and second generally arcuate shielding sections. 6. A radiation therapy shielding apparatus, according to claim 1, wherein each of said first and second generally arcuate shielding sections comprise a plurality of adjacent shielding elements, said shielding elements being longitudinally movable with respect to one another, each of said shielding elements defining an element surface which forms a unit of a section edge surface, said plurality of shielding elements defining such predetermined treatment area adjacent the patient. 7. A radiation therapy shielding assembly, according to claim 6, including a holder assembly retaining said plurality of shielding elements into an adjacent relationship whereby a plurality of element surfaces defined by said plurality of shielding elements define said predetermined edge surface.