Efficient, highly under-sampled spiral acquisition is preferred in magnetic resonance fingerprinting (MRF). However, although the spiral is very efficient in terms of sampling, it is sensitive to all kinds of off-resonance effects resulting in signal blurring. This effect leads to geometric distortion and matching errors, reducing accuracy significantly. To overcome these limitations, the present work proposes to combine spiral-based MRF with field map-based deblurring, e.g. by conjugate phase reconstruction (CPR). The basic feasibility of this approach for under-sampled MRF is shown in phantom and in-vivo experiments, underlining the effectiveness of this simple correction approach paving the way for even more efficient MRF sampling.
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