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Abstract #3888

How far PFT reconstruction technique can improve spatial resolution in radial fMRI acquisition: An experimental study

Vahid Malekian1, Fatemeh Rastegar2, and Abbas Nasiraei Moghaddam2
1School of Cognitive Science, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran (Islamic Republic of), 2Biomedical Engineering, Amirkabir University of Technology, Tehran, Iran (Islamic Republic of)

Radial acquisition along with Polar Fourier Transform (PFT) reconstruction allows to retrospectively choose the image pixel-size. We experimentally investigated how this selected pixel-size was related to spatial resolution in fMRI studies. The functional contrast to noise ratio (CNR) was considered as a measure to assess whether the improvement in apparent spatial resolution is real or just resulted from interpolation. In an fMRI study on 9 subjects, SSFP raw data was reconstructed by PFT technique with four pixel areas. Results showed that the CNR improvement stopped at the boundaries of reduced-FOV, where the spacing in azimuthal and radial directions are equal.

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