Figure 4:

(A-C) Example HASTE images of a homogeneous gel target in a hemispherical transducer filled with continuously circulating coupling baths containing varying concentrations of magnetite nanoparticles. Water motion causes MR signal from the coupling bath to incoherently superimpose onto the gel. (D) A plot of the ratio of the standard deviation of the ROI’s (green ellipses). The gel is ordinarily quite homogeneous and motion artifact creates spatial fluctuations that increase the relative standard deviation in an ROI. The nanoparticles effectively suppress these fluctuations with the largest improvement caused by the first concentration increment.