Off-resonance Blurring Tolerant Image Reconstruction of 3D Radial MRI with Linogram Sampling

A 3D radial MRI method tolerant to off-resonance blurring, which combines linogram k-space sampling, Hermitian extrapolation and a 3D ultra-short echo time sequence known as SWIFT, is introduced. The off-resonance tolerance was tested by simulation and in vivo human dental imaging at 4T. The proposed method removed off-resonance blurring that is common in radial MRI sequences; the off-resonance artifacts became displacement/distortion of images, which is similar to Cartesian MRI.

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