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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Magn Reson Med. 2010 Sep 24;65(2):492–505. doi: 10.1002/mrm.22618

Figure 5.

Figure 5

A plot of the RMSE vs. the number of calibration frames for through-time radial GRAPPA (segments of 1×1, shown in white diamonds) and hybrid radial GRAPPA. As the number of calibration frames decreases, the RMSE for through-time radial GRAPPA increases. By using small k-space segments in hybrid radial GRAPPA, this RMSE increase can be tempered. Right top: Example images reconstructed using through-time radial GRAPPA; as the number of calibration frames decreases, the image quality also decreases. Right bottom: Example images reconstructed using hybrid radial GRAPPA. Images with improved quality using fewer calibration frames can be reconstructed using this method as compared to the through-time method.