Abstract #1443
Multi-dimensional Susceptibility Conditioned RF Pulse (SCOPE) Design: A Spokes Approach
Wei Feng 1 , Yang Xuan 2 , and E Mark Haacke 3
1
Radiology, Wayne State University, Detroit,
Michigan, United States,
2
Radiology,
Wayne State University, MI, United States,
3
Wayne
State University, MI, United States
A novel multi-dimensional spokes RF pulse design method
is proposed to compensate for bulk
susceptibility-induced phase variations. Under the small
flip angle regime, there is a Fourier relationship
between the excitation pattern and the RF and gradient
waveforms, which traverses the excitation k-space. The
conventional spokes pulse design approach is modified
such that the cost function incorporates both magnitude
and phase constraints inside the desired region of
interest (ROI) based on susceptibility field map, while
the phase is allowed to vary arbitrarily outside the
ROI. Numerical Bloch simulations and imaging experiments
were performed for 1D, 2D and 3D pulse design
applications. It is shown that the proposed method is
viable and could have significant potential in
susceptibility-related imaging applications.
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