Figure 9.

(a) Experimentally measured R_1ρ dispersions at 7 T for creatine, glucose and a mixture. The single dispersions were fitted to the Chopra model in Equation ((3)), whereas the double dispersions were fitted to the double Chopra model in Equation ((4)). (b) The full blue lines indicate the individual dispersions estimated from the fitting of the black double dispersion curve, whereas the broken lines are the experimental single dispersions. The estimated curves cannot be accurately estimated when the exchange rates are too close. (c) R_1ρ dispersions at 7 T for creatine, uracil and a mixture. (d) The estimated single dispersions are much more accurate when the exchange rates are very different. PBS, phosphate-buffered saline.