Holtås S, Wallengren N O, Ericsson A, Bach-Gansmo T
Department of Diagnostic Radiology, University Hospital, Lund, Sweden.
Acta Radiol. 1990 Mar;31(2):213-6.
In a phantom study using a 0.3 tesla MR system the signal alterations, artifacts and image distortion induced by a bowel contrast medium containing superparamagnetic magnetite particles were evaluated. A concentration of 20 mg iron/l was most useful because it caused a significant signal reduction without disturbing artifacts and image distortion. The signal reduction was most pronounced on long TR/TE spin echo sequences. The appearance and distribution of artifacts are related to the direction of the static magnetic field and frequency encoding gradient. The size of artifacts is related to the concentration of the contrast medium and the band width used.
在一项使用0.3特斯拉磁共振系统的体模研究中，对一种含有超顺磁性磁铁矿颗粒的肠道造影剂所引起的信号改变、伪影和图像畸变进行了评估。20毫克铁/升的浓度最为适用，因为它能在不干扰伪影和图像畸变的情况下使信号显著降低。在长TR/TE自旋回波序列上信号降低最为明显。伪影的表现和分布与静磁场方向及频率编码梯度有关。伪影的大小与造影剂浓度和所使用的带宽有关。
