Image reconstruction for the NMR echo-planar technique, and for a proposed adaptation to allow continuous data acquisition

摘要: Abstract In its two-dimensional form the technique of echo-planar imaging achieves spatial selectivity by means one static and switched field gradient. Details image reconstruction have previously been given only for case square-wave switching. A rigorous theoretical analysis is presented, as a result which general algorithm, applicable to any periodic gradient modulation, derived. Prior processing an FFT, sampled signal multiplied set precalculated weighting coefficients. Sampling requirements resolution are analyzed special cases squarewave cosinusoidal modulation. It shown that algorithm may also be applied when adapted operate in steady-state free precession mode.