Calibration of myocardial T2 and T1 against iron concentration

Journal of Cardiovascular Magnetic Resonance

Research

Gualtiero Catani¹  Gildo Matta¹  John C Wood²  Suthat Fucharoen³  David N Firmin⁴  Mary N Sheppard⁴  Sofia V de Noronha⁴  Taigang He⁵  A John Baksi⁵  John-Paul Carpenter⁵  Dudley J Pennell⁵  Paul Kirk⁵  Michael Roughton⁶  Gianluca Forni⁷  Lisa J Anderson⁸  Adam Fleming⁹  Greg Black⁹  Timothy G St. Pierre⁹  Mike House⁹  John B Porter^1,10  J Malcolm Walker^1,10 

[1] Azienda Ospedaliera Brotzu, Cagliari, Italy;Children’s Hospital Los Angeles, California, USA;Mahidol University, Puttamonthon Nakornpathom, Thailand;NIHR Cardiovascular BRU, Royal Brompton Hospital, Sydney Street, SW3 6NP, London, UK;NIHR Cardiovascular BRU, Royal Brompton Hospital, Sydney Street, SW3 6NP, London, UK;National Heart and Lung Institute, Imperial College London, London, UK;NIHR Cardiovascular BRU, Royal Brompton Hospital, Sydney Street, SW3 6NP, London, UK;University College Hospitals NHS Trust, London, UK;Ospedali Galliera di Genova, Genoa, Italy;St George’s Hospital NHS Trust, London, UK;The University of Western Australia, Perth, Australia;University College Hospitals NHS Trust, London, UK;

关键词: Cardiovascular magnetic resonance;    Heart;    Iron overload;    Siderosis;    Thalassaemia;   

DOI  :  10.1186/s12968-014-0062-4

 received in 2013-10-22, accepted in 2014-07-31,  发布年份 2014

来源: Springer

【 摘 要 】

BackgroundThe 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.MethodsTwelve 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.ResultsFrom 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).ConclusionMyocardial 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.

【 授权许可】

Unknown   
© Carpenter et al.; licensee BioMed Central 2014