Rotating sample acquisition in ultra-low-field MRI
Yi-Cheng Hsu 1 , Koos C. J. Zevenhoven 2 , Ying-Hua Chu 1 , Juhani Dabek 2 , Risto J. Ilmoniemi 2 , and Fa-Hsuan Lin 1,2
National Taiwan University, Taipei, Taiwan,
of Biomedical Engineering and Computa of Biomedical
Engineering and Computational Science, Aalto University,
We propose the rotating sample acquisition (RSA) to
achieve efficient ultra-low-field MRI (ULF-MRI).
Specifically, the sample rotates in the instrument and
we measure ULF-MRI signals without any phase encoding.
The concomitant field artifacts can be minimized because
only frequency encoding is used. Using empirical data,
we demonstrate that RSA is more efficient than
conventional Fourier encoding when only three SQUID
sensors are used. The RSA method holds promise for a
portable imaging system using no phase encoding
gradients and few NMR signal detectors.
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