Isoda H, Takehara Y, Isogai S, Masunaga H, Takeda H, Nozaki A, Sakahara H
Department of Radiology, Hamamatsu University School of Medicine, Japan.
J Comput Assist Tomogr. 2000 Mar-Apr;24(2):308-15. doi: 10.1097/00004728-200003000-00024.
The purpose of our study was to compare contrast-enhanced 3D MR angiography (MRA) using ultrafast spoiled gradient-recalled acquisition in the steady state (SPGR) with 2D and 3D time-of-flight (TOF) MRA for visualization of intracranial lateral saccular aneurysm models.
We used lateral saccular aneurysm models with a height of 10 mm and neck sizes of 2.5 and 10 mm. Imaging was performed using a 1.5 T MR system with a head coil. Contrast-enhanced 3D MR angiograms were obtained using 3D ultrafast SPGR sequence with and without the MR Smartprep technique. Two-dimensional and 3D TOF MR angiograms were also obtained.
Contrast-enhanced multiphase 3D MR angiograms taken every 5 s after injection of contrast medium proved superior to the other MRA techniques for delineating lateral saccular aneurysm models. Contrast-enhanced 3D MRA images taken with inadequate delay after MR Smartprep trigger showed poor visualization of the aneurysm model.
Use of contrast-enhanced multiphase 3D MRA with ultrafast SPGR with shorter TR and TE resulted in clear images of the lateral saccular aneurysm model.
我们研究的目的是比较使用稳态下超快速扰相梯度回波采集（SPGR）的对比增强三维磁共振血管造影（MRA）与二维和三维时间飞跃（TOF）MRA用于颅内外侧囊状动脉瘤模型的可视化。
我们使用了高度为10毫米、颈部尺寸为2.5毫米和10毫米的外侧囊状动脉瘤模型。使用带有头部线圈的1.5T磁共振系统进行成像。使用3D超快速SPGR序列并结合和不结合MR Smartprep技术获得对比增强三维磁共振血管造影。还获得了二维和三维TOF磁共振血管造影。
注射造影剂后每隔5秒采集的对比增强多期三维磁共振血管造影在描绘外侧囊状动脉瘤模型方面优于其他MRA技术。在MR Smartprep触发后延迟不足时采集的对比增强三维MRA图像显示动脉瘤模型的可视化效果不佳。
使用具有较短TR和TE的超快速SPGR的对比增强多期三维MRA可获得外侧囊状动脉瘤模型的清晰图像。
