Patent Number: 
Section: claims

1. A method for assembling a collimator module, the collimator module including a plurality of first collimator plates arrayed in a first direction, each first collimator plate having a plurality of slots formed on a plate surface, and a plurality of second collimator plates arrayed in a second direction orthogonal to the first direction, wherein each second collimator plate penetrates respective slots along the first direction so as to form a lattice-shape, the method comprising:positioning the plurality of first collimator plates by moving a first collimator plate in one direction along the second direction, so that a side wall of a first cutout formed on an edge of an x-ray radiation incident side or an x-ray radiation output side of the first collimator plate contacts a member extending in the first direction. 2. The method for assembling the collimator module according to claim 1, wherein when positioning the plurality of first collimator plates, the first collimator plate is moved by hooking a springy member on the first cutout and pulling the first collimator plate with a tension. 3. The method for assembling the collimator module according to claim 2, further comprising, after positioning the plurality of first collimator plates:inserting the plurality of second collimator plates into the respective slots; andsandwiching each second collimator plate between the side walls of each slot by hooking the springy member on the first cutouts of a part of the plurality of first collimator plates and moving the part of the plurality of first collimator plates in a direction opposite to the one direction. 4. The method for assembling the collimator module according to claim 2, further comprising, after positioning the plurality of first collimator plates:inserting the plurality of collimator plates into the respective slots; andsandwiching each second collimator plate between the side walls of each slot by hooking the springy member on a third cutout which is different from the first cutout and formed on one end side along the second direction of the edge of a part of the plurality of first collimator plates and moving the part of the plurality of first collimator plates in a direction opposite to the one direction. 5. The method for assembling the collimator module according to claim 4, wherein the part of the plurality of first collimator plates is one of odd and even numbered collimator plates of the plurality of first collimator plates. 6. The method for assembling the collimator module according to claim 1, wherein when positioning the plurality of first collimator plates, the first collimator plate is moved by hooking a springy member on a second cutout which is different from the first cutout and is formed on the edge of the first collimator plate, and pulling the first collimator plate with a tension. 7. The method for assembling the collimator module according to claim 6, wherein the first cutout is formed on one end side along the second direction of the edge, and the second cutout is formed on the other end side along the second direction of the edge. 8. The method for assembling the collimator module according to claim 6, further comprising, after positioning the plurality of first collimator plates:inserting the plurality of second collimator plates into the respective slots; andsandwiching each second collimator plate between the side walls of each slot by hooking the springy member on the first cutouts of a part of the plurality of first collimator plates and moving the part of the plurality of first collimator plates in a direction opposite to the one direction. 9. The method for assembling the collimator module according to claim 6, further comprising, after positioning the plurality of first collimator plates:inserting the plurality of second collimator plates into the respective slots; andsandwiching each second collimator plate between the side walls of each slot by hooking the springy member on a third cutout which is different from the first cutout and formed on one end side of the edge of a part of the plurality of first collimator plates along the second direction, and moving the part of the plurality of first collimator plates in a direction opposite to the one direction. 10. The method for assembling the collimator module according to claim 9, wherein the part of the plurality of first collimator plates is one of odd and even numbered collimator plates of the plurality of first collimator plates. 11. The method for assembling the collimator module according to claim 1, further comprising, prior to positioning the plurality of first collimator plates:placing a first block and a second block with a space therebetween in the second direction, wherein the first and second blocks have respective grooves for placing the edges of the plurality of first collimator plates along the second direction; andinserting the plurality of first collimator plates into the respective grooves. 12. The method for assembling the collimator module according to claim 11, further comprising bonding the plurality of first collimator plates, the plurality of second collimator plates, and the first block and the second block. 13. The method for assembling the collimator module according to claim 1, wherein the collimator module is configured to be used with an x-ray radiation tomographic imaging apparatus. 14. The method for assembling the collimator module according to claim 1, wherein the collimator module is configured to be used with an x-ray radiation projection imaging apparatus.