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. Author manuscript; available in PMC: 2013 Oct 19.
Published in final edited form as: IEEE Trans Med Imaging. 2012 Nov 15;32(2):338–347. doi: 10.1109/TMI.2012.2227121

Fig. 3.

Fig. 3

FFL excitation diagram and magnetic field plot. a) Diagram of the permanent magnets that generate the FFL and of the solenoidal transmit coil that excites USPIOs at 20 kHz. The arrow above the transmit coil indicates that the excitation direction is along the z axis. The ~2 Hz slow shift of the FFL occurs along the x axis. b) Magnetic field plot of the FFL with darker colors corresponding to smaller field strengths.