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. Author manuscript; available in PMC: 2018 Jul 1.
Published in final edited form as: Magn Reson Med. 2017 Dec 1;80(1):294–303. doi: 10.1002/mrm.27015

Figure 4.

Figure 4

Three distinct, empirically derived T2b signal models are presented. Left) The most widely used T2b model was derived using bovine blood over hematocrit values of 35%–55% and is highly nonlinear at low hematocrit. Middle) The HbA model (13) was calibrated across hematocrit values of 10%–55% using blood of healthy subjects and demonstrates a bilinear relationship between 1/T2b, hematocrit, and (1-Y)2. The gray circles represent individual measurements. Right) The ex vivo T2b model derived in this work is fairly distinct from both aforementioned T2b models, demonstrating no hematocrit dependence. The red asterisks denote the individual ex vivo measurements used to derive the T2b model fits.