Kiker W E, Hinz T W, Ledley R S
Med Phys. 1976 Jan-Feb;3(1):42-4. doi: 10.1118/1.594228.
An experiment has been carried out in which an ACTA computerized axial-transverse tomographic scanner was used in a series of scans on a polystyrene phantom. Cavities in the phantom contained distilled water and various concentrations of acetic acid or ferric nitrate in aqueous solution. It is shown that the ACTA numbers generated for the low-Z acetic acid solution are proportional to the electron density of the solution, but that such is not the case for the higher-Z ferric nitrate, where photoelectric absorption is significant. The correlation of scanner numbers with electron density rather than with mass density is discussed and, as an illustrative example, the electron densities of whole blood and blood cells are calculated and the relative value is compared with the relative mass densities of the materials.
进行了一项实验，其中使用ACTA计算机轴向断层扫描仪对聚苯乙烯模型进行了一系列扫描。模型中的腔室装有蒸馏水以及不同浓度的醋酸或硝酸铁水溶液。结果表明，低原子序数的醋酸溶液产生的ACTA数值与溶液的电子密度成正比，但对于高原子序数的硝酸铁溶液情况并非如此，因为其中光电吸收显著。讨论了扫描仪数值与电子密度而非质量密度的相关性，并作为一个示例，计算了全血和血细胞的电子密度，并将其相对值与这些物质的相对质量密度进行了比较。
