| 摘要 |
A light-weight, portable X-ray tomography system having an annular frame supporting therein a concentric apertured dram rotatable in its plane about a rotational axis, and a plurality of components for performing a tomographic scan all mounted on the drum with respect to both sides of the mean plane of the drum so as to be dynamically balanced for rotation with the drum about the rotational axis, and so that the center of the mass moment of inertia, the center of rotation, the center of thermal expansion of the drum and components mounted thereon, and the center of the scanning plane substantially coincident on that rotational axis. |
