Exploring the Limits of Super-Resolution MRI with Phaseless Encoding

Tian, R; Hennel, F; Pruessmann, KP

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Exploring the Limits of Super-Resolution MRI with Phaseless Encoding

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https://archive.ismrm.org/2018/2671.html
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Tian, R., Hennel, F., & Pruessmann, K. (2018). Exploring the Limits of Super-Resolution MRI with Phaseless Encoding. In Joint Annual Meeting ISMRM-ESMRMB 2018.

Cite as: https://hdl.handle.net/21.11116/0000-000A-F7D4-0

Abstract

The recently proposed method of Super-resolution (SR) MRI with phaseless subpixel encoding simultaneously samples three neighboring k-space bands and provides resolution enhancement factor up to 3.0. We now demonstrate an almost five-fold resolution enhancement by applying additional encoding steps of higher modulation frequency, which allows five bands to be acquired without compromising the methods’ immunity to phase fluctuations. Since the signal-to-noise ratio at high resolution becomes critical, we derived and experimentally verified the optimum flip angle of the encoding (tagging) sequence. A possibility to correct artefacts caused by flip angle inhomogeneity is also shown based on simulation.