Frahm C, Gehl H B, Melchert U H, Weiss H D
Medizinische Universität zu Lübeck, Institut für Radiologie, Ratzeburger Allee 160, D-23538 Lübeck, Germany.
Cardiovasc Intervent Radiol. 1996 Sep-Oct;19(5):335-40. doi: 10.1007/BF02570186.
For two types of passively visualizable magnetic resonance (MR)-compatible needles, the size of susceptibility artifacts was investigated at 0.2 and 1.5 Tesla (T) and assessed regarding their suitability for needle visualization.
Phantom trials were performed using T1-weighted spin echo (SE), turbospin echo (TSE) and gradient echo (GE) sequences and different angles beta between the needles and the main magnetic field (B0).
Depending on the needle angle beta and the applied pulse sequence, we found artifact diameters of 0-9.7 mm employing SE, of 1.7-9.4 mm employing TSE, and of 1.4-20.6 mm employing GE at 1.5 T. At 0.2 T, we found artifact diameters of 0-5.7 mm employing SE, of 0-6.3 mm employing TSE, and of 0-11.3 mm employing GE.
Comparing artifact sizes at 1. 5 T and 0.2 T, low field strength is superior for passive visualization of the needles tested-especially if GE imaging is performed.
对于两种类型的被动可视化磁共振（MR）兼容针，研究了在0.2和1.5特斯拉（T）时的磁化率伪影大小，并评估了它们对针可视化的适用性。
使用T1加权自旋回波（SE）、快速自旋回波（TSE）和梯度回波（GE）序列以及针与主磁场（B0）之间的不同角度β进行体模试验。
根据针的角度β和所应用的脉冲序列，我们发现在1.5T时，使用SE的伪影直径为0 - 9.7mm，使用TSE的为1.7 - 9.4mm，使用GE的为1.4 - 20.6mm。在0.2T时，使用SE的伪影直径为0 - 5.7mm，使用TSE的为0 - 6.3mm，使用GE的为0 - 11.3mm。
比较1.5T和0.2T时的伪影大小，低场强对于所测试针的被动可视化更具优势——特别是在进行GE成像时。
