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. 2014 Feb 5;5:29. doi: 10.3389/fmicb.2014.00029

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Copyright © 2014 Sengupta, Quiaoit, Thompson, Prato, Gelman and Goldhawk.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Relaxation rate measurement in a spherical phantom. Representative data indicate the influence of echo time (TE) on signal decay. (A) Single-echo SE images show sample wells in cross section at three different TE values (13, 100, and 300 ms): 1, parental (P); 2, MagA (A); 3, iron-supplemented MagA (A + Fe); 4, iron-supplemented parental (P + Fe); and 5 polystyrene marker for reference. Samples along the bottom row are combinations of MagA-expressing and parental cells. (B) R2 relaxation curves are shown for iron-supplemented samples. Symbols indicate the mean signal intensity within a region of interest (ROI) at each TE. Curves represent the best fit to an exponential decay.