FAST PARALLEL SPIRAL CSI AT 3 TESLA USING ITERATIVE SENSE RECONSTRUCTION

这个子项目是许多研究子项目中利用 资源由NIH/NCRR资助的中心拨款提供。子项目和 调查员(PI)可能从NIH的另一个来源获得了主要资金， 并因此可以在其他清晰的条目中表示。列出的机构是 该中心不一定是调查人员的机构。 螺旋化学位移成像(CSI)通过获取时间域数据，同时沿两个空间维度显示螺旋梯度波形，缩短了CSI实验的扫描时间。这实现了空间信息和光谱信息的同时编码，并在理论上允许使用单一激励获取完整的2D CSI数据集。然而，对于大多数应用，最大梯度强度和摆动速率的限制通常需要多个激励，其中要么移动数据采集的开始(频谱交错)，要么旋转螺旋k空间轨迹(空间交错)。在更高的场强下，由于化学位移的分散性增加，梯度限制更是一个问题。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Spiral chemical shift imaging (CSI) reduces the scan time of a CSI experiment by acquiring the time domain data while playing out spiral gradient waveforms along two spatial dimensions. This achieves the simultaneous encoding of both spatial and spectral information and theoretically permits the acquisition of a complete 2D CSI data set with a single excitation. However, for most applications, limitations on maximum gradient strength and slew rate usually make multiple excitations necessary in which either the start of the data acquisition is shifted (spectral interleaves) or the spiral k-space trajectories are rotated (spatial interleaves). Gradient limitations are even more a problem at higher field strength because of the increased dispersion of the chemical shift.