| 摘要 |
PROBLEM TO BE SOLVED: To enable realization of transmission CT (TCT) having a wide effective field of view without using a specific collimator, by providing a shield which interrupts the incidence of radiation on a radiation detector positioned in an opposite direction to the center of the effective field of view in respect to a radiation source. SOLUTION: A shielding plate 19 for limiting a radiation angle of radiation is provided in contact with a power source 11 for transmission CT (TCT) and made rotatable around an effective field 1 of view. Detectors 3, 5 and 7 being fixed, the power source 11 for TCT is rotated once around the effective field 1 of view and data on the intensity of transmitted radiation are collected by the detectors 3, 5 and 7. When the TCT radiation source 11 comes near to the front of any one of the detectors 3, 5 and 7, the radiation being ineffective for collection of the data by the detector is interrupted by the shielding plate 19. According to this constitution, equipment for radiographic diagnosis enabling execution of the TCT having a wide effective field of view without using a specific collimator can be obtained.
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