Figure 1
From: Improved respiratory motion self-gating in cardiovascular MRI
(a): K-space sampling in ky-kz plane was ordered in a ROtating Cartesian Kspace (ROCK) manner, with each spiral arm represents one acquisition segment. A center ky-kz (SI projection) line was inserted at the beginning of each segment for respiratory self-gating. (b): Motion extraction and correlation with ventilator results of the four algorithms on two representative patients. CM and PCA for patient 1 are highly oscillating which is undesirable without additional filter. TCC provided smoother respiratory profile and has the highest correlation with ventilator signal.