STREAK ARTIFACTS IN DYNAMIC CT - A PHANTOM STUDY OF THE ANTERIOR UPPER ABDOMEN
STREAK ARTIFACTS IN DYNAMIC CT - A PHANTOM STUDY OF THE ANTERIOR UPPER ABDOMEN
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DOI：
10.1177/028418518402500408
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发表时间：
1984-01-01
期刊：
影响因子：
--
通讯作者：
KORMANO, M
中科院分区：
文献类型：
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作者：
PARTANEN, K;KORMANO, M
使用 Somatom 2 CT 扫描仪进行动态 CT [计算机断层扫描] 扫描期间的人体模型实验表明，在患者肝脏前部看到的周期性条纹伪影是由胃蠕动和由此产生的气液面运动引起的。因此，在动态扫描系列期间，肝脏前部的衰减值人为地在基线值附近振荡。这种伪影是由胃空气液位位置的变化产生的，并且取决于管旋转的方向。人为振荡衰减读数的平均值接近平均密度，但在动态 CT 中通常无用，因为衰减值在动态阶段变化如此之快，以至于平均测量也会导致误差。
Experiments with a body phantom during dynamic CT [computed tomography] scanning with the Somatom 2 CT scanner indicate that the periodic streak artifacts seen on the anterior part of the liver in patients are caused by peristalsis of the stomach and resulting motion of the air fluid level. Therefore, the attenuation values of the anterior portion of the liver artifactually oscillate around the baseline value during the dynamic series of scans. This artifact is produced by a change in the position of the stomach air fluid level and is dependent on the direction of tube rotation. The mean of the artifactually oscillating attenuation readings is close to the mean density but usually useless in dynamic CT because the attenuation values change so rapidly in the dynamic phase that averaging measurements also will cause errors.