Marcelo Victor Wust Zibetti1, Azadeh Sharafi1, Mahesh Bharath Keerthivasan2, and Ravinder Regatte1
1Radiology, NYU Langone Health, New York, NY, United States, 2Siemens Healthineers, New York, NY, United States
1Radiology, NYU Langone Health, New York, NY, United States, 2Siemens Healthineers, New York, NY, United States
A balanced
center-out k-space-filling scheme (or ordering) kept T1rho mapping values
stable across different acceleration factors in compressed sensing with
optimized SPs and Poisson disk SPs.
Figure 2: k-Space orderings used
for data collection. The a. linear
side-to-side (LSS) and b. linear
alternated center-out (LACO) are machine-provided orderings, used only in
fully-sampled acquisitions. The two customized orderings we evaluated are c. balanced center-out (BCO) and d. center-random (CR). For the same SP
and accelerated factor (AF), e. BCO
and g. CR differ only on how the
phase-encoding positions are ordered in each block. Both share the same initial
positions, but in f. BCO the
following points are closed to each other, while in h. CR the following points are random.
Figure 5: T1rho maps of a representative human
knee joint (medial slice on the top, lateral slice on the bottom) obtained with
different sampling patterns (SPs), such as optimal SP and Poisson disk (PD),
and both customized orderings: balanced center-out (BCO) and center-random (CR).
