Resolution improvement in Quantitative Susceptibility Mapping by denser sampling of spatial dipole field
Yuya Umemoto 1 , Mai Murashima 2,3 , Tomohiro Ueno 2 , and Naozo Sugimoto 2
Faculty of Medicine, Kyoto University,
Kyoto, Kyoto, Japan,
of Medicine, Kyoto University, Kyoto, Kyoto, Japan,
address Toshiba Medical Systems Corporation, Otawara,
In Quantitative Susceptibility Mapping, susceptibility
distribution can be obtained by deconvolving a perturbed
magnetic field with a spatial unit dipole field. The
spatial dipole field has a rapid changing nature. In
this study, we employed a denser sampled dipole field in
the deconvolving process to improve spatial resolution
of QSM. We created Shepp-Logan phantom including partial
volume effects and used as a low resolution input data.
A Fourier-transformed dipole field with high resolution
was created analytically, and a perturbed field was
expanded by the nearest neighbor method. With the
proposed method, a susceptibility map with higher
spatial resolution was obtained.
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