Katscher Ulrich, Börnert Peter
Philips Research Laboratories, Roentgenstrasse 24-26, D-22335 Hamburg, Germany.
Neurotherapeutics. 2007 Jul;4(3):499-510. doi: 10.1016/j.nurt.2007.04.011.
Parallel MRI started with the introduction of coil arrays in improving radiofrequency (RF) acquisition (what is called parallel imaging) and continued with an analogous development for RF transmission (parallel transmission). Based on differences in the spatial sensitivity distributions of the involved array elements, both techniques try to shorten the respective k-space trajectory. Parallel imaging refers to the acquisition of k-space data, whereas parallel transmission is dealing with the deposition of RF energy packages in the excitation k-space. However, parallel transmission is not simply the reciprocal of parallel imaging. The main goal of parallel imaging is the shortening of the acquisition time. The main goal of parallel transmission is the shortening of the pulse duration of spatially selective RF pulses. The present article describes the basic concept, the state of the art, and the similarities and differences of both technologies.
并行磁共振成像始于线圈阵列的引入，用于改善射频（RF）采集（即所谓的并行成像），随后在射频传输方面也有类似的发展（并行传输）。基于所涉及阵列元件空间灵敏度分布的差异，这两种技术都试图缩短各自的k空间轨迹。并行成像指的是k空间数据的采集，而并行传输则涉及射频能量包在激发k空间中的沉积。然而，并行传输并非简单地是并行成像的逆过程。并行成像的主要目标是缩短采集时间。并行传输的主要目标是缩短空间选择性射频脉冲的脉冲持续时间。本文描述了这两种技术的基本概念、现状以及异同点。
