Figure 5
From: Single-shot frequency offset measurement with HASTE using the selective parity approach
Schematic of the SP-HASTE reconstruction performed for each receiver element. The OP and EP data are separated and missing k-space lines are filled using SPIRiT (step 1). Transformation into the image domain (step 2) results in two images that should have a complex conjugate relationship defined relative to the CPMG angle. An estimate of the CPMG angle is obtained as the angle bisecting the OP and EP phases in each voxel (step 3). Using this estimate of the CPMG phase angle it is then possible to transform OP data to EP data and vice versa generating pseudo OP and EP data (step 4). The original and pseudo data are then averaged (step 5) and transformed back into k-space (step 6). Data consistency is enforced by restoring the originally acquired data for each parity (step 7). If the resulting magnitude images are identical to within 1% tolerance the procedure is terminated (step 8) or a new iteration is performed.
