Abstract #2641

Effect of K-Space Sampling Pattern on SNR in Parallel MRI Accelerated IDEAL Sequences.

Shawn Joseph Kisch¹, Philip M. Robson², Catherine DG. Hines³, Bryan T. Addeman¹, Huanzhou Yu⁴, Ann Shimakawa⁴, Ananth Madhuranthakam⁴, Ajit Shankaranarayanan⁴, Jean Brittain⁴, Scott Reeder³, Charles McKenzie^1,5

¹Department of Medical Biophysics, University of Western Ontario, London, ON, Canada; ²Department of Radiology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA; ³Department of Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, USA; ⁴Applied Sciences Laboratory, GE Healthcare; ⁵Department of Biomedical Engineering, University of Western Ontario, London, ON, Canada

We investigate the variation in signal-to-noise-ratio (SNR) in parallel MRI accelerated IDEAL images due to the k-space sampling pattern. The pseudo replica SNR measurement used allows for an accurate measurement of SNR in both liver water and liver fat images produced by the IDEAL sequence. A comparison between different sampling patterns in each IDEAL echo with an overall acceleration factor of two in a PMRI sequence is made. The results show that the SNR is independent of the choice of calibration echo, but is maximized when a uniform k-space sampling pattern is used.