Abstract #0622

Multispectral Body Diffusion-Weighted Imaging

Valentina Taviani¹, Shreyas S. Vasanawala¹, and Brian A. Hargreaves¹

¹Stanford University, Stanford, CA, United States

A diffusion-weighted (DW) imaging method was developed to mitigate off-resonance-induced distortion and signal loss, which are problematic for body applications. A 2D RF pulse is used in place of the conventional spectral-spatial excitation used for DW spin echo echo-planar imaging. In the presence of off-resonance, a narrow band of frequencies is excited due to the different bandwidths between excitation and refocusing pulses. By progressively shifting the center frequency, the whole range of off-resonance can be excited and a composite image, corrected for off-resonance-induced distortion, can be reconstructed by estimating the field map from the spectral information.

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