| 摘要 |
<p>PROBLEM TO BE SOLVED: To exert a high resolution quickly in a compact constitution by setting a plurality of pairs of detecting apparatuses each comprising an X-ray generator and an X-ray detector via a space to a flow of a body to be detected, and carrying out detection. SOLUTION: A parcel 3' running on a conveyor is placed on a conveyor rotational guide 21 of a parcel-rotating device 8 within a shield box. An X-ray detection apparatus is constituted of an X-ray generator and an X-ray detector in pairs. X-ray generators 31, 32, 33, 34 and X-ray detectors 35, 36, 37, 38 are fixed to a fixing guide 41. Each detection apparatus is arranged on the same plane to the parcel 3'. A fan beam angle is set to be 24 deg.. The detection is carried out for every 1 deg. of a parcel rotational angle 51 deg., whereby 51 projection data are obtained by one detection apparatus. A total of 51×4=204 projection data are obtained by the four detection apparatuses. A clear pickup image is achieved when the projection data of 40 or more are collected. The 51 deg. rotation can obtain the same data as a 204 deg. rotation, reducing a scan time to 1/4.</p> |
