Silu Han1, Chidi Patrick Ugonna1, Mahesh Bharath Keerthivasan2,3, and Nan-kuei Chen1,3
1Biomedical Engineering Department, The University of Arizona, Tucson, AZ, United States, 2Siemens Medical Solutions USA, New York, NY, United States, 3Medical Imaging Department, The University of Arizona, Tucson, AZ, United States
1Biomedical Engineering Department, The University of Arizona, Tucson, AZ, United States, 2Siemens Medical Solutions USA, New York, NY, United States, 3Medical Imaging Department, The University of Arizona, Tucson, AZ, United States
Our novel 2D coil-signature-based phase-cycled
reconstruction method can successfully reduce Nyquist artifacts in
EPI.
Figure 1. Illustration
of SB-EPI correction. Figure 1(a): SB-EPI with
Nyquist artifact. Figure 1(b): Regions marked as green used for CSP comparison. Figure
1(c): A series of corrected complex images of one coil after applying different
possible phase value. Figure 1(d): Reference Nyquist artifact-free CSP and CSPs
generated from corrected complex images in Figure 1(c). Figure
1(e): Variations of CSP difference compared to reference Nyquist artifact-free CSP with
different phase value.
Figure 2. Workflow of correction for SENSE MB-EPI ($$$Acc_{in}=2,Acc_{MB}=2$$$). (A): SENSE MB-EPI; (B): Possible phase value along frequency-encoding
direction; (C): Performed correction; (D): Corrected complex
images with different phase values; (E): Corresponding CSPs;
(F): Nyquist artifact-free CSP; (G): Determined phase $$$C_{0}$$$; (H): Possible phase value
along phase-encoding direction; (I): Cycled 2D phase map; (J): Unaliased CSP from
scanner; (K): Performed correction with 2D phase map and unaliased CSP; (L)
Final corrected images.