General Formulation for Quantitative G-factor Calculation in GRAPPA Reconstructions

被引:172
作者
Breuer, Felix A. [1 ]
Kannengiesser, Stephan A. R. [2 ]
Blaimer, Martin [1 ]
Seiberlich, Nicole [3 ]
Jakob, Peter M. [1 ,4 ]
Griswold, Mark A. [3 ]
机构
[1] Res Ctr, D-97074 Wurzburg, Germany
[2] Siemens Med Solut, Erlangen, Germany
[3] Univ Hosp Cleveland, Dept Radiol, Cleveland, OH 44106 USA
[4] Univ Wurzburg, Dept Expt Phys 5, D-97070 Wurzburg, Germany
关键词
GRAPPA; g-factor; parallel imaging; quantitative noise enhancement; PARALLEL; EFFICIENCY;
D O I
10.1002/mrm.22066
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
100231 [临床病理学]; 100902 [航空航天医学];
摘要
In this work a theoretical description for practical quantitative estimation of the noise enhancement in generalized autocalibrating partially parallel acquisitions (GRAPPA) reconstructions, equivalent to the geometry (g)-factor in sensitivity encoding for fast MRI (SENSE) reconstructions, is described. The GRAPPA g-factor is derived directly from the GRAPPA reconstruction weights. The procedure presented here also allows the calculation of quantitative g-factor maps for both the uncombined and combined accelerated GRAPPA images. This enables, for example, a fast comparison between the performances of various GRAPPA reconstruction kernels or SENSE reconstructions. The applicability of this approach is validated on phantom studies and demonstrated using in vivo images for 1D and 2D parallel imaging. Magn Reson Med 62: 739-746, 2009. (C) 2009 Wiley-Liss, Inc.
引用
收藏
页码:739 / 746
页数:8
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