Patent Number: 
Section: claims

1. A radiation image capturing apparatus comprising:a radiation source for applying a radiation to a breast of a subject;a radiation detector for detecting the radiation which has passed through said breast, a side surface of said radiation detector being positioned so as to face a chest wall of the subject; anda grid disposed between said breast and said radiation detector for absorbing scattered rays of said radiation, said grid comprising radiation-permeable members extending substantially parallel to said side surface of said radiation detector and radiation-impermeable members extending substantially parallel to said radiation-permeable members, said radiation-permeable members and said radiation-impermeable members being disposed alternately in a direction away from said side surface of said radiation detector. 2. A radiation image capturing apparatus according to claim 1, wherein said radiation-impermeable members are inclined to a plane of said grid at respective angles that are progressively smaller away from the chest wall of said subject, so that said grid serves as a convergent grid whose focal point is located at said radiation source. 3. A radiation image capturing apparatus according to claim 1, further comprising a grid controller for controlling said grid to reciprocate in directions perpendicular to the direction in which said radiation-permeable members and said radiation-impermeable members extend. 4. A radiation image capturing apparatus according to claim 3, further comprising a radiation source controller for controlling said radiation source to inhibit said radiation from being applied to said breast when said grid is reversed in reciprocating movement thereof. 5. A radiation image capturing apparatus according to claim 3, further comprising a shutter for blocking said radiation emitted from said radiation source, said shutter being disposed between said radiation source and said grid, and a shutter controller for controlling said shutter to block said radiation emitted from said radiation source when said grid is reversed in reciprocating movement thereof. 6. A radiation image capturing apparatus according to claim 1, wherein said radiation source is positioned directly above said side surface of said radiation detector, and a radiation direction of said radiation source is directed to said radiation detector. 7. A radiation image capturing apparatus according to claim 1, wherein said radiation source is movable with respect to the subject in a direction in parallel with said side surface. 8. A radiation image capturing apparatus according to claim 1, wherein the radiation is emitted from said radiation source at least at two different angles, and wherein said radiation image capturing apparatus further comprises an image processor for producing a sectional radiation image based on the radiation detected by said radiation detector. 9. A radiation image capturing apparatus comprising:a radiation source for applying a radiation to a subject, said radiation source being movable with respect to said subject;a radiation detector for detecting the radiation which has passed through said subject; anda grid for absorbing scattered rays of said radiation, said grid comprising radiation-permeable members extending substantially parallel to a direction in which said radiation source is movable and radiation-impermeable members extending substantially parallel to said radiation-permeable members, said radiation-permeable members and said radiation-impermeable members being disposed alternately in a direction substantially perpendicularly to said direction in which said radiation source is movable. 10. A radiation image capturing apparatus according to claim 9, wherein said radiation-impermeable members are inclined to a plane of said grid at respective angles that progressively vary along a direction in which said radiation-impermeable members are arrayed, so that said grid serves as a convergent grid whose focal point is located at said radiation source. 11. A radiation image capturing apparatus according to claim 9, further comprising a grid controller for controlling said grid to reciprocate in directions perpendicular to the direction in which said radiation-permeable members and said radiation-impermeable members extend. 12. A radiation image capturing apparatus according to claim 11, further comprising a radiation source controller for controlling said radiation source to inhibit said radiation from being applied to said subject when said grid is reversed in reciprocating movement thereof. 13. A radiation image capturing apparatus according to claim 11, further comprising a shutter for blocking said radiation emitted from said radiation source, said shutter being disposed between said radiation source and said grid, and a shutter controller for controlling said shutter to block said radiation emitted from said radiation source when said grid is reversed in reciprocating movement thereof.