ESPIRiT--an eigenvalue approach to autocalibrating parallel MRI: where SENSE meets GRAPPA.
ESPIRiT--an eigenvalue approach to autocalibrating parallel MRI: where SENSE meets GRAPPA.
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DOI:
10.1002/mrm.24751
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发表时间:
2014-03
影响因子:
3.3
通讯作者:
Lustig, Michael
中科院分区:
文献类型:
--
作者:
Uecker, Martin;Lai, Peng;Murphy, Mark J.;Virtue, Patrick;Elad, Michael;Pauly, John M.;Vasanawala, Shreyas S.;Lustig, Michael
Parallel imaging allows the reconstruction of images from undersampled multi-coil data. The two main approaches are: SENSE, which explicitly uses coil sensitivities, and GRAPPA, which makes use of learned correlations in k-space. The purpose of this work is to clarify their relationship and to develop and evaluate an improved algorithm A theoretical analysis shows: 1. The correlations in k-space are encoded in the null space of a calibration matrix. 2. Both approaches restrict the solution to a subspace spanned by the sensitivities. 3. The sensitivities appear as the main eigenvector of a reconstruction operator computed from the null space. The basic assumptions and the quality of the sensitivity maps are evaluated in experimental examples. The appearance of additional eigenvectors motivates an extended SENSE reconstruction with multiple maps, which is compared to existing methods The existence of a null space and the high quality of the extracted sensitivities are confirmed. The extended reconstruction combines all advantages of SENSE with robustness to certain errors similar to GRAPPA. In this paper the gap between both approaches is finally bridged. A new autocalibration technique combines the benefits of both.
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影响因子:
3.3
作者:
Raj, Ashish;Singh, Gurmeet;Weiner, Michael
通讯作者:
Weiner, Michael
影响因子:
10.6
作者:
Harikumar, G;Bresler, Y
通讯作者:
Bresler, Y
影响因子:
3.3
作者:
Griswold, MA;Jakob, PM;Haase, A
通讯作者:
Haase, A
影响因子:
20.6
作者:
Frigo, M;Johnson, SG
通讯作者:
Johnson, SG
DOI:
10.1109/29.32276
发表时间:
1989-07-01
期刊:
IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND SIGNAL PROCESSING
影响因子:
--
作者:
ROY, R;KAILATH, T
通讯作者:
KAILATH, T