| 摘要 |
<p>In devices for reconstructing the absorption distribution in a layer of a body on the basis of the measuring values obtained by means of an (Emi) scanner, the measuring values or the values derived therefrom are "spread" along strips which occupy the same position relative to the image plane as the strips along which the measuring value has been obtained relative to the layer. This "spreading" is effected in that for each image element it is measured to what extent it is covered by this strip the measuring values, or the values derived therefrom assigned to those strips being proportionally distributed across the calculated surfaces in order to calculate the absorption. This requires a comparatively long calculating time and very fast and hence expensive multiplier circuits. The inventionoffers a simpler possibility of assigning the measuring values, or the values derived therefrom, to the individual image elements, the calculation of weighting factors being eliminated by the sub-division of each image element into smaller image points (9 to 16 times smaller). _ ?? _</p> |
