Figure 5.
Experimental (a) and c)) versus simulated (b) and d)) MR signal as a function of TE for two different θs (other flip angle not shown). The left column displays SPGR signal (from TE = 8 μs − i.e. UTE − to TE = 33 ms) whereas the right one shows SubUTE data. Theoretical curves were calculated using TR = 300 ms, T10 = 2.7 s, T20* = 25 ms, r1 = 4.5 mM−1.s−1 and r2* = 145 mM−1.s−1, consistent with presented in vitro data. Both experimental and simulated datasets are normalized to allow clear comparison (0 mM SPGR MR signal set to 100 at TE = 0 ms and θ = 50°).