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(Color online) (a) MPI Relaxometer. (b) Ideal (without relaxation), measured, and fitted one-dimensional x-Space MPI signals (UWASH20, d = 18.7 nm ± 5.6 nm, τ = 16.3 μs, and Bpp = 24 mT). (c) Two-dimensional relaxogram that gives both the distribution of the USPIO diameter and relaxation constant. (d) X-space PSFs for frozen and liquid Resovist tracer indicate that Resovist nanoparticles relax with both Néel and Brownian mechanisms.
(Color online) Mean relaxation constant as a function of excitation strength for single domain magnetic nanoparticles. As expected, the effective relaxation constant decreases as we increase the excitation magnitude.
Measured USPIO diameter, relaxation constant, and resolution. Excitation amplitude B peak–peak = 24 mT, N = 4.
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