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Abstract #4149

Aliasing Separation in Accelerated MR Image Acquisition by Voxel Modification

Min-Oh Kim1, Joonsung Lee1, Sang-Young Zho1, Dong-Hyun Kim1

1Electrical and Electronic Engineering, Yonsei University, Seoul, Korea, Republic of

Aliasings occurred due to undersampled phase-encodings in accelerated MR imaging are separated to readout direction by applying additional gradient along undersampled direction at readout timing. Resolution and FOV are redefined due to voxel modification as sheared form. With this method, 6x acceleration is achieved in high-resolution invivo 3D imaging with a partial loss of diagonal resolution. Further acceleration is possible by using parallel imaging techniques such as SENSE and GRAPPA.

Keywords

accelerate accelerated acceleration according achieved acquiring acquisition addition alias aliasing amount anisotropic apart application applied applying arrow artifacts axial bandwidth better bigger blurring bottom boxed called caused causes characteristic clear columns combined concept conceptual considered correction corresponds cost define defined depicted designed desired despite development diagonal diagram distance dong electrical electronic encoding engineering enough excitation exist expected explained field final focused form free gradient gradients grid half hand illustrated illustration inclined include increasing increment indicated length lengths limitation limitations linear little loss makes manually matrix measured merged middle modification modifications modified needed noted object optimize parallel partial percentages perspective phantom phasing power procedures proportionally proposed pulse pulses readout reconstructed reconstruction reduce reducing reduction relation require required resolution resolutions respectively samples sampling sang scanner selectively separated separates separation sequentially several sheared shearing simultaneous slab slice slope special spin strategic successfully tagged trajectory trio useful vascular view views visualize weaver words yellow young