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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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Transverse relaxation rate mapping. Representative maps are shown for (A) R2, (B) R2^* and (C) R2’. The first two maps were obtained using voxel by voxel curve fitting with an exponential decay function and the R2’ map was obtained by subtraction (R2^*–R2). The units of the scale bar are sec^-1. Images show sample wells in the phantom, in cross section. From left to right across the top row are: parental (P); MagA (A); iron-supplemented MagA (A + Fe); and iron-supplemented parental (P + Fe). Along the bottom row, from left to right, there is a polystyrene marker for reference and samples with combinations of iron-supplemented, MagA-expressing and parental cells. These samples decrease from 70% A + Fe to 50% and 30% and were not further evaluated. Note that pixel values for all three rates are highest for A + Fe. Maps are provided for display only; relaxation rates (Table 2) were determined as outlined in methods.