(A) study on fast NMR imaging method

Abstract

In this paper, A Fast NMR Imaging Method using Spiral Scanning Echo Planar Imaging(SEPI) Method is studied with KAIS 2.0 Tesla Superconduting Magnet. With SEPI technique, whole spatial k-domain data are obtained by a spiral scan or several spiral scan called interlacing technique. These spiral trajectories in k-domain can be obtained by applying linear increasing sinusoidal gradient fields. In single scan SEPI technique, spatial resolution is limited by maximum gradient field of gradient system. To increase it, under the many physical restrictions (i.e., $T^2$, inhomogeneity and limitation of gradient etc.), interlaced SEPI is developed. In high speed imaging, the field inhomogeneity has serious influences on reconstructed images than the non-high speed imaging techniques, i.e. KWE technique. For the inhomogeneity correction in SEPI, curved backprojection is used. And well corrected human head transaxial image is obtained.