Abstract #2851

A 3D-Plus-Time Radial-Cartesian Hybrid Sampling of K-Space with High Temporal Resolution & Maintained Image Quality for MRI & fMRI

Maria Magnusson^1,2, Olof Dahlqvist Leinhard^2,3, Peter Lundberg^2,3

¹Dept. of Electrical Engineering, Linkping University, Linkping, Sweden; ²Center for Medical Image Science & Visualization (CMIV), Linkping University, Linkping, Sweden; ³Radiation Physics, Linkping University, Linkping, Sweden

The novel method PRESTO-CAN for 3D-plus-time resolved MRI includes a radial-Cartesian hybrid sampling. Golden ratio angular sampling and hourglass filtering provides high temporal resolution. When the MRI-data is used for fMRI, the echo times are long, TE ≈ 37-40 ms, and result in field inhomogeneities and phase variations in the reconstructed images. Therefore, PRESTO-CAN also includes its own calibration and correction procedure. Reconstruction is performed using gridding. The image quality is almost identical to what can be obtained with conventional Cartesian sampling. However, it will be improved further by using a recently proposed optimal pre-weighting function during gridding.