Optimized Combination of Parallel MRI & Sliding Window Reconstruction for Accelerated Time Resolved Radial MRI

Alexey A. Samsonov¹, Julia V. Velikina², Walter F. Block²

Sliding window (SW) gridding reconstruction has been an efficient way to reconstruct undersampled interleaved radial MRI data. Temporal SW filters reduce streaking artifacts, but also reduce temporal resolution at higher spatial frequencies. Parallel MRI (pMRI) may mitigate the artifacts and improve temporal footprint. However, the actual undersampling factors in existing radial MRI applications may result in significant noise/resolution loss. The combination of pMRI and SW may result in improved image quality than with each individual method alone. In this research, we propose an optimized method to combine k-space based parallel MRI with SW reconstruction for radial trajectories.