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Please use this identifier to cite or link to this item: http://repository.li.mahidol.ac.th/dspace/handle/123456789/33929
Title: Calibration of myocardial T2 and T1 against iron concentration
Authors: John Paul Carpenter
Taigang He
Paul Kirk
Michael Roughton
Lisa J. Anderson
Sofia V. De Noronha
A. John Baksi
Mary N. Sheppard
John B. Porter
J. Malcolm Walker
John C. Wood
Gianluca Forni
Gualtiero Catani
Gildo Matta
Suthat Fucharoen
Adam Fleming
Mike House
Greg Black
David N. Firmin
Timothy G. St. Pierre
Dudley J. Pennell
Royal Brompton Hospital
National Heart and Lung Institute
St George's Healthcare NHS Trust
UCL
Children's Hospital Los Angeles
E.O. Ospedali Galliera
Azienda Ospedaliera Brotzu
Mahidol University
University of Western Australia
Keywords: Health Professions;Medicine
Issue Date: 12-Aug-2014
Citation: Journal of Cardiovascular Magnetic Resonance. Vol.16, No.1 (2014)
Abstract: © 2014 Carpenter et al.; licensee BioMed Central. Background: The assessment of myocardial iron using T2∗ cardiovascular magnetic resonance (CMR) has been validated and calibrated, and is in clinical use. However, there is very limited data assessing the relaxation parameters T1 and T2 for measurement of human myocardial iron. Methods. Twelve hearts were examined from transfusion-dependent patients: 11 with end-stage heart failure, either following death (n = 7) or cardiac transplantation (n = 4), and 1 heart from a patient who died from a stroke with no cardiac iron loading. Ex-vivo R1 and R2 measurements (R1 = 1/T1 and R2 = 1/T2) at 1.5 Tesla were compared with myocardial iron concentration measured using inductively coupled plasma atomic emission spectroscopy. Results: From a single myocardial slice in formalin which was repeatedly examined, a modest decrease in T2 was observed with time, from mean (±SD) 23.7 ± 0.93 ms at baseline (13 days after death and formalin fixation) to 18.5 ± 1.41 ms at day 566 (p < 0.001). Raw T2 values were therefore adjusted to correct for this fall over time. Myocardial R2 was correlated with iron concentration [Fe] (R20.566, p < 0.001), but the correlation was stronger between LnR2 and Ln[Fe] (R20.790, p < 0.001). The relation was [Fe] = 5081•(T2)-2.22between T2 (ms) and myocardial iron (mg/g dry weight). Analysis of T1 proved challenging with a dichotomous distribution of T1, with very short T1 (mean 72.3 ± 25.8 ms) that was independent of iron concentration in all hearts stored in formalin for greater than 12 months. In the remaining hearts stored for <10 weeks prior to scanning, LnR1 and iron concentration were correlated but with marked scatter (R20.517, p < 0.001). A linear relationship was present between T1 and T2 in the hearts stored for a short period (R20.657, p < 0.001). Conclusion: Myocardial T2 correlates well with myocardial iron concentration, which raises the possibility that T2 may provide additive information to T2∗ for patients with myocardial siderosis. However, ex-vivo T1 measurements are less reliable due to the severe chemical effects of formalin on T1 shortening, and therefore T1 calibration may only be practical from in-vivo human studies.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84906932304&origin=inward
http://repository.li.mahidol.ac.th/dspace/handle/123456789/33929
ISSN: 1532429X
10976647
Appears in Collections:Scopus 2011-2015

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