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Purpose: Cross-term spatiotemporal encoding-xSPEN-is a single-shot imagingapproach with exceptional resilience to field heterogeneities: its images donot require a priori information nor use post-acquisition corrections, todeliver faithfully the spatial distribution. xSPEN, however, suffers from SNRpenalties due to its non-Fourier nature and due to diffusion losses- speciallywhen desiring high resolution. This study explores partial Fourier transformapproaches that acting along either the readout or the spatiotemporally-encodeddimensions, reduce these penalties.  Methods: xSPEN uses an orthogonal gradient to read, in direct space, thelowbandwidth dimension. This changes substantially the nature of partialFourier acquisitions vis-a-vis conventional imaging counterparts. A suitabletheoretical analysis, however, allows one to implement these procedures alongeither the low-bandwidth or readout axes.  Results: Partial Fourier single-shot xSPEN methods are illustrated onpreclinical and human scanners. Owing to their reduction in the experimentalacquisition times, these methods provide substantial sensitivity gainsvis-a-vis previous implementations for a given targeted in-plane resolution.The magnitude of these gains is as expected.  Conclusion: Partial Fourier approaches, particularly when implemented alongthe xSPEN axis, can provide substantial sensitivity advantages at minimal costsin the operation of the single-shot experiments.

Partial Fourier techniques in single-shot cross-term spatiotemporal encoded MRI