中心扫描 SPRITE 磁共振成像

Centric scan SPRITE magnetic resonance imaging.

作者信息

Halse Meghan, Goodyear David J, MacMillan Bryce, Szomolanyi Pavol, Matheson David, Balcom Bruce J

机构信息

Department of Physics, MRI Centre, PO Box 4400, University of New Brunswick, Fredericton, NB, Canada E3B 5A3.

出版信息

J Magn Reson. 2003 Dec;165(2):219-29. doi: 10.1016/j.jmr.2003.08.004.

DOI:10.1016/j.jmr.2003.08.004

PMID:14643703

Abstract

Two rapid, pure phase encode, centric scan, Single Point Ramped Imaging with T1-Enhancement (SPRITE) MRI methods are described. Each retains the benefits of the standard SPRITE method, most notably the ability to image short T2* systems, while increasing the sensitivity and generality of the technique. The Spiral-SPRITE method utilizes a modified Archimedean spiral k-space trajectory. The Conical-SPRITE method utilizes a system of spirals mapped to conical surfaces to sample the k-space cube. The sampled k-space points are naturally Cartesian grid points, eliminating the requirement of a re-gridding procedure prior to image reconstruction. The effects of transient state behaviour on image resolution and signal/noise are explored.

摘要

本文描述了两种快速、纯相位编码、中心扫描、具有T1增强功能的单点斜坡成像（SPRITE）磁共振成像（MRI）方法。每种方法都保留了标准SPRITE方法的优点，最显著的是能够对短T2*系统进行成像，同时提高了该技术的灵敏度和通用性。螺旋SPRITE方法采用了修改后的阿基米德螺旋k空间轨迹。锥形SPRITE方法利用映射到锥面的螺旋系统对k空间立方体进行采样。采样的k空间点自然是笛卡尔网格点，消除了图像重建前重新网格化过程的要求。探讨了瞬态行为对图像分辨率和信号/噪声的影响。