Design of k-space channel combination kernels and integration with parallel imaging.
OBJECTIVE
In this work, a new method is described for producing local k-space channel combination kernels using a small amount of low-resolution multichannel calibration data. Additionally, this work describes how these channel combination kernels can be combined with local k-space unaliasing kernels produced by the calibration phase of parallel imaging methods such as GRAPPA, PARS and ARC.


METHODS
Experiments were conducted to evaluate both the image quality and computational efficiency of the proposed method compared to a channel-by-channel parallel imaging approach with image-space sum-of-squares channel combination.


RESULTS
Results indicate comparable image quality overall, with some very minor differences seen in reduced field-of-view imaging. It was demonstrated that this method enables a speed up in computation time on the order of 3-16X for 32-channel data sets.


CONCLUSIONS
The proposed method enables high quality channel combination to occur earlier in the reconstruction pipeline, reducing computational and memory requirements for image reconstruction.
Global Applied Science Laboratory, GE Healthcare, Toronto, Canada; Physical Sciences, Sunnybrook Research Institute, Toronto, Canada; Department of Medical Biophysics, University of Toronto, Toronto, Canada.
Philip J
PJ
Beatty
Shaorong
S
Chang
James H
JH
Holmes
Kang
K
Wang
Anja C S
AC
Brau
Scott B
SB
Reeder
Jean H
JH
Brittain
D000465:Algorithms; D016477:Artifacts; D001931:Brain Mapping / Q000379:methods; D002138:Calibration; D003287:Contrast Media; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008279:Magnetic Resonance Imaging / Q000379:methods*; D019047:Phantoms, Imaging; D015203:Reproducibility of Results
D003287:Contrast Media
channel combination; channel compression; direct virtual coil; k-space kernel; parallel imaging