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Calibration of myocardial T2 and T1 against iron concentration.

Carpenter, JP; He, T; Kirk, P; Roughton, M; Anderson, LJ; de Noronha, SV; Baksi, AJ; Sheppard, MN; Porter, JB; Walker, JM; et al. Carpenter, JP; He, T; Kirk, P; Roughton, M; Anderson, LJ; de Noronha, SV; Baksi, AJ; Sheppard, MN; Porter, JB; Walker, JM; Wood, JC; Forni, G; Catani, G; Matta, G; Fucharoen, S; Fleming, A; House, M; Black, G; Firmin, DN; St Pierre, TG; Pennell, DJ (2014) Calibration of myocardial T2 and T1 against iron concentration. Journal of Cardiovascular Magnetic Resonance, 16 (62). ISSN 1532-429X https://doi.org/10.1186/s12968-014-0062-4
SGUL Authors: He, Taigang Sheppard, Mary Noelle

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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.

Item Type: Article
Additional Information: © 2014 Carpenter et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
Keywords: Cardiovascular magnetic resonance, Heart, Iron overload, Siderosis, Thalassaemia, Nuclear Medicine & Medical Imaging, 1102 Cardiovascular Medicine And Haematology
SGUL Research Institute / Research Centre: Academic Structure > Molecular and Clinical Sciences Research Institute (MCS) > Cardiac (INCCCA)
Journal or Publication Title: Journal of Cardiovascular Magnetic Resonance
ISSN: 1532-429X
Language: eng
Dates:
DateEvent
12 August 2014Published
PubMed ID: 25158620
Web of Science ID: WOS:000341847000001
Go to PubMed abstract
URI: https://openaccess.sgul.ac.uk/id/eprint/107267
Publisher's version: https://doi.org/10.1186/s12968-014-0062-4

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