Radial scanning technique for volume selective ³¹P spectroscopy

Abstract

An interlaced radial scanning method that is ideally suited for 31P spectroscopy with short T2 components and a wide spectral range is presented. The proposed method, which uses an additional radial gradient and radial scans in the k-space, minimizes T2 decay during the selection time and also optimizes the volume selectivity in a given gradient field strength. Simulation and experimental results with a short selection time of 2 ms demonstrate that the proposed method is suitable for volume selective 31P spectroscopy.

2D arbitrary shape‐selective excitation summed spectroscopy (ASSESS)

“…It is difficult to excite more complicated shapes with a broad bandwidth because the required spiral trajectory cannot be broken up into less than one cycle for each subpulse. Also, for 31 P NMR Rim et al (26) employed a radial gradient coil to make 64 self‐refocused radial scanning loci to excite a rectangular volume with 12‐ppm bandwidth at 2T. Radial gradient coils are not standard tools on most MRI scanners, which prevents this method from being more widely used.…”