Spiral MR Reconstruction Using FOCUSS

Hisamoto Moriguchi¹, Yutaka Imai¹

It has recently demonstrated that the focal underdetermined system solver (FOCUSS) can successfully be adapted to angularly undersampled projection reconstruction (PR). Images reconstructed using PR-FOCUSS are of high quality. In this study, FOCUSS can be extended to spiral trajectories with reduced spiral interleaves. The newly proposed method is referred to as eSpiral FOCUSSf. Images reconstructed using Spiral FOCUSS substantially reduce aliasing artifacts from those reconstructed using conventional reconstruction methods, e.g. gridding. The algorithm can also be applied to general non-uniform sampling methods. Spiral FOCUSS is a quite useful reconstruction technique that permits faster spiral acquisition while maintaining image quality.