| 摘要 |
A source of X-rays is mounted so it can move in a predetermined path relative to an object, a detector is mounted so it can move in a second path relative to that object, the predetermined path has a fixed center, and the predetermined path is so interrelated with the second path that a predetermined point on the source and a predetermined point on the detector define a succession of translated parallel lines, which pass through the object, as the source and the detector move, respectively, through the predetermined and second paths.
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