Sigal R, Bittoun J, Jolivet O, Behnam N, Suminski M, Zannoli G, Francke J P
Centre Inter-Etablissement de Résonance Magnétique, Bicêtre Hospital, Paris XI University, Le Kremlin-Bicêtre, France.
Br J Radiol. 1995 Mar;68(807):261-5. doi: 10.1259/0007-1285-68-807-261.
High spatial resolution T1 weighted images of the brain were acquired in 5-13 min on a whole-body magnetic resonance imager operating at 1.5 T. In order to obtain 5-8 cm field of view images, the receiver bandwidth (Bw) was lowered to 2 kHz. The use of a 2 kHz Bw, instead of the standard 16 kHz Bw, partially compensated the signal loss due to the small pixel size by increasing the signal-to-noise ratio, without scan time penalty. The chemical shift artifact associated with reduced Bw was not observed because fat signal is negligible in the brain.
在一台1.5T的全身磁共振成像仪上，于5 - 13分钟内采集了高空间分辨率的脑部T1加权图像。为了获得视野为5 - 8厘米的图像，将接收带宽（Bw）降至2千赫兹。使用2千赫兹的带宽而非标准的16千赫兹带宽，通过提高信噪比部分补偿了因像素尺寸小而导致的信号损失，且不增加扫描时间。由于大脑中的脂肪信号可忽略不计，所以未观察到与降低带宽相关的化学位移伪影。
