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
中科院分区:
文献类型:
--
作者:
Busch MG;Finsterbusch J
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.
登录
查看更多内容
影响因子:
3.3
作者:
Finsterbusch J;Busch MG
通讯作者:
Busch MG
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
通讯作者:
--
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
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