密度分辨率是CT系统性能的重要参数, 噪声级别影响着CT系统的密度分辨率并与之存在弱正相关性, 而电压、电流和重建范围等工艺因素直接影响CT系统的量子噪声。采用圆盘法来研究不同工艺因素对工业CT系统密度分辨率的影响。在此基础上, 探讨在相同功率下, 使用工业CT系统测试不同材料(铝合金、钛合金或有机玻璃)时达到最佳密度分辨率时的扫描参数。

Density resolution is an important parameter of CT system. Noise and density resolution were found to have a statistically significant positive correlation. To research the relationship between the scanning parameters(tube voltage, tube current, field of reconstruction and so on, which had significant influences on noise level) and density resolution, the disc phantom method was introduced and applied in the practical testing of an industrial X-ray CT under certain acquisition conditions. Then the results were demonstrated and discussed. At last, this paper discussed the parameters of the best density resolution under the same power.