Jingfei Ma, Ph. D.
Applied Science Lab, GE Medical Systems
In clinical MRI, the complex image after Fourier transform of
the raw data is usually converted into a magnitude-only image
for display. As a result, signal phase is generally discarded
in the magnitude operation. A notable exception is the phase-contrast
(PC) imaging, where preserving the phase is critical for
extracting the encoded blood flow information. A few other phase
sensitive imaging methods exist, but they are mainly restricted to
the research community due to the complexity and limited robustness.
In this talk, I will discuss the design and implementation of two
phase-sensitive imaging examples, Dixon imaging for water and fat
separation, and phase-sensitive inversion recovery imaging for
improved tissue contrast. Both techniques have been under study
for over a decade. Here, special emphasis will be paid to the
reliability and the efficiency of the methods, crucial for their
clinical adoption. An antithetical example will also be given
in the case of diffusion weighted projection reconstruction fast
spin echo imaging where elimination of the signal phase is required
to ensure high-quality images. Along the discussion of these
relatively traditional imaging techniques, some potential new
applications will be illustrated.
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