Abstract #3178
A concomitant method to unwrap phase images with fringelines
Wen-Tung Wang 1 , Ningzhi Li 2 , Dzung Pham 3 , and John Anthony Butman 4
1
1Center for Neuroscience and Regenerative
Medicine, Henry Jackson Foundation, Bethesda, MD, United
States,
2
Center
for Neuroscience and Regenerative Medicine, Henry
Jackson Foundation, MD, United States,
3
1Center
for Neuroscience and Regenerative Medicine, Henry
Jackson Foundation, MD, United States,
4
Diagnostic
Radiology, National Institute of Health, MD, United
States
A number of phase unwrapping algorithms can faithfully
unwarp wrapped MRI phase images on a voxel-by-voxel
basis. These sequential algorithms cannot unwrap phase
fringelines, which terminate at singular poles. The
method based on Fourier properties and trigonometric
identities of the Laplacian operator can unwrap wrapped
raw phase images with fringelines, but its resultant
images show low-frequency deviation. By combining the
Fourier method with a sequential algorithm by Cusack et
al. using high- and low-pass filtering, the wrapped raw
phase with fringelines can be unwrapped without
low-frequency deviations.
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