Du Jiang, Korosec Frank R, Wu Yijing, Grist Thomas M, Mistretta Charles A
Department of Medical Physics and Radiology, University of Wisconsin, Madison, WI 53792, USA.
Magn Reson Imaging. 2008 Feb;26(2):181-7. doi: 10.1016/j.mri.2007.06.005. Epub 2007 Sep 10.
Conventional bolus-chase acquisition generates peripheral runoff images using a single injection of the contrast material. Low spatial resolution, small slice coverage and venous contamination are major problems especially in the distal stations. A technique is presented herein in which whole-body magnetic resonance angiography is performed using a dual-contrast-injection four-station acquisition protocol. Bolus sharing was performed between two stations: the abdomen and calf stations share the first bolus injection, while the thorax and thigh stations share the second bolus injection. The combination of variable density sampling and elliptical centric acquisition order was applied to the abdomen and thorax stations. The scan time was extended to generate high spatial resolution arterial phase images with broad slice coverage for the calf and thigh stations. The feasibility of this technique was demonstrated using phantom and in vivo human volunteer studies.
传统的团注追踪采集通过单次注射对比剂生成外周血流灌注图像。低空间分辨率、小切片覆盖范围和静脉污染是主要问题，尤其是在远端部位。本文介绍了一种技术，其中使用双对比剂注射四部位采集方案进行全身磁共振血管造影。在两个部位之间进行团注共享：腹部和小腿部位共享第一次团注注射，而胸部和大腿部位共享第二次团注注射。可变密度采样和椭圆中心采集顺序的组合应用于腹部和胸部部位。延长扫描时间以生成高空间分辨率的动脉期图像，覆盖小腿和大腿部位的宽切片。使用模型和体内人体志愿者研究证明了该技术的可行性。
