| 摘要 |
PROBLEM TO BE SOLVED: To reduce a radiation dosage entering a subject regarding a general imaging system, more specifically regarding a system and a method for reducing the radiation dosage entering the subject. SOLUTION: A collimator comprises a first collimator (122), a second collimator (150) and a third collimator (180). In this case, the first collimator (122) is equipped with an outer shape which curves in proportion with the outer shape of a detector (18). The second collimator (150) is equipped with blades (152 and 154), and for which the tilts of opposite two surfaces (160, 162, 156 and 158) of at least one of the blades (152 and 154) are different from each other. The third collimator has at least two sets of plates (184, 186, 190 and 192), and for which the plates (184, 186, 190 and 192) in one set relatively pivot. COPYRIGHT: (C)2005,JPO&NCIPI
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