| 摘要 |
An X-ray scanner phantom 110 includes a plurality of portions 112. Each portion is a three-dimensional shape having a width, a length and a depth. The width and/or the length of one portion differs from the width and/or the length of another portion. Each portion may be elliptical, and the plurality of portions may form a stepped arrangement. The phantom 110 may be constructed as a hollow shell, which may be filled with a fluid (e.g. water), or a solid (e.g. resin). The phantom 110 may also be constructed with individual portions connected together. An insert assembly 116 having a plurality of cylindrical inserts may be placed in the centre of the phantom. The cylinders may be formed of, or contain, materials to simulate tissue. A central cylinder (304, fig. 3A) may be acrylic and include a dosimeter. A support 106 for the phantom 110 may also be provided. The phantom is to test the automatic exposure control (AEC) systems of CT scanners or hybrid systems (e.g. SPECT/CT). |
