Novena
Rangwala1,2, Xiaohong Joe Zhou1,3
1Center for Magnetic Resonance
Research, University of Illinois Medical Center, Chicago, IL, United States; 2Department
of Bioengineering, University of Illinois at Chicago, Chicago, IL, United
States; 3Departments of Radiology, Neurosurgery and Bioengineering,
University of Illinois Medical Center, Chicago, IL, United States
A
new technique for phase correction of individual blades for EPI-PROPELLER
sequences is proposed. Constant,
linear, and oblique phase corrections are performed by synthesizing the
reference scans for arbitrary blade orientations, using only two reference
scans acquired in orthogonal directions. This technique was found to decrease
the Nyquist ghost by at least 75%, yielding images comparable to those
obtained by using time-consuming, blade-specific reference scans.