Sub-second 3D Image Reconstruction with Gradwarp Correction in Moving Table MRI
Riederer S, Polzin J, Kruger D, Grimm R
Large FOV MR imaging using continuous table motion is susceptible to artifacts arising from the nonlinearities of image gradients. Images contain spatially dependent blurring in addition to spatial distortion. Ideally, a 3D Fourier transform and gradwarp correction is required for each acquisition. Despite the seeming intense computational requirements, image reconstruction can be accomplished in 2.3s with an off-the-shelf PC. In a realtime implementation with a 5ms TR, a group-wise recon could be performed every eight TRs. Using an eight-node blade system, total reconstruction times drop to 420ms or a group-wise recon could potential be done for every TR.