The lab's in-house developed Matlab code for susceptibility-induced B0 perturbation was uploaded to the public website for Matlab file exchange. This short code, which was verified in many numerical and phantom experiments over the past year, is the first publicized MRI research tool developed from the lab. For those who are knowledgeable in this subject, most researchers are using k-space-discretized dipolar field convolution for 3D B0 calculation. The proposed method, called generalized susceptibility voxel convolution (gSVC), takes advantage of an analytical formula for the dipolar field from a magnetized rectangular block, and is inherently free from k-space discretization artifacts. Also, its computational speed does not depend on the relative distance between the susceptibility source and the B0 target grids, allowing fast computation for e.g. breathing-induced B0 inhomogeneity in the head. We will see how users out there will respond to the code!
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