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Journal of Cardiovascular Magnetic Resonance

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Open Access 01-12-2014 | Research

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

Published in: Journal of Cardiovascular Magnetic Resonance | Issue 1/2014

Abstract

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] (R² 0.566, p < 0.001), but the correlation was stronger between LnR2 and Ln[Fe] (R² 0.790, p < 0.001). The relation was [Fe] = 5081•(T2)^-2.22 between 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 (R² 0.517, p < 0.001). A linear relationship was present between T1 and T2 in the hearts stored for a short period (R² 0.657, 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.

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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
Publication date: 01-12-2014
Publisher: BioMed Central
Published in: Journal of Cardiovascular Magnetic Resonance / Issue 1/2014
Electronic ISSN: 1532-429X
DOI: https://doi.org/10.1186/s12968-014-0062-4

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Calibration of myocardial T2 and T1 against iron concentration

Abstract

Background

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Methods

Results

Conclusion

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