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. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Magn Reson Med. 2011 Sep 27;67(5):1427–1433. doi: 10.1002/mrm.23130

Figure 5.

Figure 5

Demonstrates a novel exchange rate based contrast enhancement method using Eq. 3. The same image data from Figure 4, which used Eq. 2, were used to generate Figure 5. Image values near one represent a good match between the selected ω1(ex) and the average exchange rate. Values for ω1(high) and ω1(low) were fixed at the maximum and minimum acquired SLA. Top Left = IO alone, Top Right = BSA alone, Bottom = Both.

5.a. ω1(ex) = ~1 kHz, SLT = 156 msec.

5.b. ω1(ex) = ~2800 Hz, SLT =156 msec.

5.c. ω1(ex) = ~7800 Hz, SLT = 156 msec.

Note that by choosing an exchange rate near the mean exchange rate of the phantom of interest, the contrast can be modified to emphasize the presence of a substance with an exchange rate near the selected ω1(ex) value.