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. Author manuscript; available in PMC: 2013 Jul 16.
Published in final edited form as: NMR Biomed. 2011 Jul 14;25(2):189–194. doi: 10.1002/nbm.1729

Figure 2.

Figure 2

Simulation shows the steady state magnetization for the conventional spin echo (SE) MRI was both TR and TE dependent. (a) Z-magnetiza-tion for the conventional SE MRI as a function of repetition time without π pulse (solid), and with π pulse applied at 12.5 ms and 500 ms (i.e. TE = 25 ms (dashed) and 1 s (dotted)). (b) The normalized T2 for the conventional SE MRI as a function of TR, revealing that underestimation of T2 was particularly severe for the long T2 component at short TR. (c) Analysis of SNR as a function of TR for both conventional SE and the proposed fast radio-frequency enforced steady state (FRESS) T2 MRI. It shows that SNR per time was maximal at TR slightly above its T1 values, suggesting the necessity of developing quantitative T2 MRI at short TR.