Single spin-echo proton transverse relaxometry of Iron-loaded liver

Tim St Pierre, P.R. Clark, Wanida Chua-Anusorn

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    84 Citations (Scopus)


    A single-spin-echo methodology is described for the measurement and imaging of proton transverse relaxation rates (R-2) in iron-loaded and normal human liver tissue in vivo. The methodology brings together previously reported techniques dealing with (i) the changes in gain between each spin-echo acquisition, (ii) signal level offset due to background noise, (iii) estimation of signal intensities in decay curves at time zero to enable reliable extraction of relaxation times from tissues with very short T-2 values, (iv) bi-exponential modelling of decay curves with a small number of data points, and (v) reduction of respiratory motion artefacts. The accuracy of the technique is tested on aqueous manganese chloride solutions yielding a relaxivity of 74.1 +/- 0.3 s(-1) (mM)(-1) consistent with previous reports. The precision of the in vivo measurement of mean liver R-2 values is tested through duplicate measurements on 10 human subjects with mean liver R-2 values ranging from 26 to 220 s(-1). The random uncertainty on the measurement of mean liver R-2 was found to be 7.7% Copyright (C) 2004 John Wiley Sons, Ltd.
    Original languageEnglish
    Pages (from-to)446-458
    JournalNMR in Biomedicine
    Issue number7
    Publication statusPublished - 2004

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