Spatially 2D‐selective RF excitations using the PROPELLER trajectory: Basic principles and application to MR spectroscopy of irregularly shaped single voxel

Spatially 2D‐selective RF excitations using the PROPELLER trajectory: Basic principles and application to MR spectroscopy of irregularly shaped single voxel
复制标题

使用 PROPELLER 轨迹进行空间 2D 选择性射频激励:基本原理及其在不规则形状单个体素 MR 波谱中的应用

DOI:
10.1002/mrm.22903
复制
发表时间:
2011
影响因子:
3.3
通讯作者:
Finsterbusch J
Finsterbusch J
中科院分区:
医学3区
文献类型:
--
作者:
Busch MG;Finsterbusch J

文献摘要

参考文献

被引文献

相似文献

空间二维选择性射频(2DRF)激发能够在其激发平面上激发出任意形状的轮廓,因此可以用来减小单体素磁共振谱中的部分体积效应。在这项研究中,提出了基于螺旋桨轨迹的2DRF激励,该轨迹由相互相对旋转的平行线叶片组成。由于k-空间中心被每个分段覆盖,因此该轨迹产生了高信号效率,例如,与分段闪光平面方法相比,该信号效率显著提高。结果表明,基于螺旋桨轨迹Voronoi图的采样密度修正抑制了不必要的侧向激励。非共振效应,如化学位移伪影,可以通过在叶片线条之间应用非选择性重新聚焦射频脉冲来最小化。由于采用了半傅里叶分段,2DRF的回波时间贡献可以大大缩短。因此,获得了能够在短回波时间内以高信号效率激发高分辨率轮廓的健壮的2DRF激励。它们适用于任意形状的单体素的磁共振波谱,在两瓶体模和活体人脑的3T全身磁共振系统上得到了验证。Magn Reson Med,2011。©2011 Wiley期刊,Inc.
Spatially two‐dimensional selective radio frequency (2DRF) excitations are able to excite arbitrarily‐shaped profiles in their excitation plane and, hence, can be used to minimize partial volume effects in single‐voxel magnetic resonance spectroscopy. In this study, 2DRF excitations based on the PROPELLER trajectory which consists of blades of parallel lines that are rotated against each other, are presented. Because thek‐space center is covered with each segment, the trajectory yields a high signal efficiency which, e.g., is considerably improved compared to a segmented blipped‐planar approach. It is shown that a sampling density correction based on the PROPELLER trajectory's Voronoi diagram suppresses unwanted side excitations. Off‐resonance effects like chemical‐shift displacement artifacts, can be minimized by applying nonselective refocusing radio frequency pulses between the lines of a blade. With half‐Fourier segments, the 2DRF's echo time contribution can be shortened considerably. Thus, robust 2DRF excitations capable of exciting high‐resolution profiles at short echo times with high signal efficiency are obtained. Their applicability to MR spectroscopy of an arbitrarily‐shaped single voxel is demonstrated in a two‐bottle phantom and in the human brain in vivo on a 3 T whole‐body MR system. Magn Reson Med, 2011. © 2011 Wiley Periodicals, Inc.
分段 2D 选择性 RF 激励,具有加权平均和翻转角自适应,适用于不规则形状体素的 MR 波谱
DOI: 10.1002/mrm.22806
发表时间: 2011
影响因子: 3.3
作者:
Finsterbusch J;Busch MG
通讯作者: Busch MG
Ohshiro T:“尿激酶处理材料的临床应用。酶学方法,学术出版社”学术出版社,16(1988)
DOI: --
发表时间: --
期刊:
影响因子: --
作者:
通讯作者: --
更快的 MR 成像方法
DOI: --
发表时间: 1986
期刊: Other Conferences
影响因子: --
作者:
P. Margosian;F. Schmitt
通讯作者: F. Schmitt
使用基于 blipped-plan 轨迹的分段二维选择性射频激励对活体人脑中任意形状的单个体素进行短回波时间磁共振波谱分析
DOI: 10.1016/j.mri.2008.10.004
发表时间: 2009
影响因子: 2.5
作者:
Weber-Fahr W;Busch MG;Finsterbusch J
通讯作者: Finsterbusch J
DOI: 10.1006/jmrb.1994.1048
发表时间: 1994-05-01
期刊: JOURNAL OF MAGNETIC RESONANCE SERIES B
影响因子: --
作者:
OGG, RJ;KINGSLEY, PB;TAYLOR, JS
通讯作者: TAYLOR, JS