| 摘要 |
<p>An apparatus for use with a diagnostic computer tomography scanner which uses a radiant energy beam (16) for imaging purposes includes a masking member (10) fabricated from a material that attenuates radiant energy and having an aperture (12) for passing a substantially unattenuated portion of the beam therethrough, and means for fastening the masking member (10) to the scanner so as in use to interpose the masking member between a beam source (30) and a chosen area (22), whereby the unattenuated portion of the beam passes through the aperture (12) to irradiate the chosen area (22). The apparatus enables a conventional diagnostic computer tomography scanner to be adapted for use in therapy as well as in diagnosis.</p> |
