| 摘要 |
The present invention is especially suited for tomographic X-ray studies wherein dozens of exposures are required. A film cassette spacer having selected dimensions and having selected markings thereon is placed adjacent to the film cassette on a mechanically centering bucky tray in an X-ray machine. By use of the collimating means in the X-ray head, the number of exposures on the film can be maximized but still maintaining quality exposures for reading.
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