Reduction of X-ray exposure and contrast material dose at abdominal CT using low kV or plural kV setting

我们用CT做了幻体实验。假体模拟成人腹部，包括0-12 mg/ dl的水和碘溶液。在不同的管电压（80、100、120、140 kVp）和管电流设定（30-200mA）下扫描幻体。研究了噪声值、比噪比、优值、噪声功率谱、视觉对比度分辨率。我们还研究了图像滤波器和重建算法的影响。在80 kVp扫描时，CNR和视觉对比度分辨率是最可接受的，但在80 kVp扫描时，噪声大多增加，需要通过图像滤波器或专用重建算法进行降噪。我们还进行了低千伏CT扫描的临床研究。

We performed phantom experiment with CT. The phantom simulated adult abdomen and included water and iodine solution with 0-12 mg/ dl. The phantom was scanned with various tube voltage(80, 100, 120, 140 kVp) and tube current setting(30-200mA). We investigated noise value, contrast-noise-ration, figure of merit, noise power spectrum, visual contrast resolution. We also investigated the effect of image filters and reconstruction algorithm. The CNR and visual contrast resolution was the most acceptable at 80 kVp scanning, however, noise was mostly increased at 80 kVp scan and noise reduction by image filters or dedicated reconstruction algorithm was necessary. We also performed clinical studies as to low kV CT scanning.