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T2 Relaxation
Figure 4 shows metabolite signal decay due to T2 relaxation. The panel on the right shows the first fast Fourier transformed echo of a control subject dataset from the ACC. To the left are sets of 48 spectral fragments around the metabolite peak of interest (tNAA, tCr, or tCho) as indicated by the horizontal lines. There are 3 sets each from one control and one BD subject, and they span the 30 - 500 ms range (left to right) in 10 ms increments. Each series is presented with spectral amplitude normalized to the first spectrum for presentation purposes. The difference in signal decay due to T2 relaxation is evident: fastest in tCr, followed by tCho, and finally by tNAA.
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