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. Author manuscript; available in PMC: 2018 Sep 1.
Published in final edited form as: J Magn Reson Imaging. 2017 Jan 20;46(3):751–757. doi: 10.1002/jmri.25611

Figure 2.

Figure 2

Comparison of three expedited whole-brain IR-SPACE protocols (echo train length [ETL] = 52) to the reference protocol (i.e. previously proposed long-duration protocol whereby ETL = 36). For SNR/CNR comparisons (a), the expedited protocol with a prescribed T2 of 170 or 200 ms provided significant (marked with *) improvements. For wall sharpness comparisons (b), a general trend of decrease in vessel wall sharpness was observed as prescribed T2 increased, especially at the outer wall boundary. However, deterioration was not statistically significant with any of the expedited protocols.