Histological validation of cardiac magnetic resonance T1 mapping for detecting diffuse myocardial fibrosis in diabetic rabbits. Issue 5 (9th April 2016)

• Record Type: Journal Article
• Authors: Zeng, Mu; Zhang, Nan; He, Yi; Wen, Zhaoying; Wang, Zhanhong; Zhao, Yike; Greiser, Andreas; An, Jing; Zhang, Tianjing; Jing, Bin; Zhang, Xin; Fan, Zhanming; Li, Debiao
• Is Part Of: Journal of magnetic resonance imaging. Volume 44:Issue 5(2016)
• Page Start: 1179
• Page End: 1185
• Publication Date: 2016-04-09
• Subjects: T1 mapping -- native T1 value -- postcontrast T1 value -- ECV -- diabetic rabbit -- diffuse myocardial fibrosis; Magnetic resonance imaging -- Periodicals; 616
• DOI: 10.1002/jmri.25268
• Languages: English
• ISSNs: 1053-1807

Abstract

Abstract : Purpose: To pathologically verify the correlation between native T 1 mapping, postcontrast T 1 mapping, and extracellular volume fraction (ECV) and myocardial diffuse fibrosis, as determined by collagen volume fraction (CVF). Materials and Methods: Thirty New Zealand white rabbits were randomly divided into the control group ( n = 6), diabetes 3 months group ( n = 8), diabetes 6 months group ( n = 8), and diabetes 9 months group ( n = 8). All the rabbits underwent clinical 3.0T magnetic resonance (MR) examinations with pre‐ and postcontrast modified Look–Locker inversion recovery T 1 mapping. For the histological study, each rabbit was sacrificed after MR scanning, hematoxylin and eosin and Masson staining of the left ventricular myocardium were performed, and CVF was calculated. Pre‐ and postcontrast T 1 values and ECV were compared to CVF using Pearson's correlation coefficients. Results: Two rabbits died in each diabetes group, thus each group included six rabbits. ECV calculated from pre‐ and postcontrast T 1 values showed a very strong correlation with CVF ( r = 0.876, P < 0.001), whereas postcontrast T 1 values exhibited a moderate correlation with CVF ( r = –0.564, P = 0.004). In contrast, precontrast T 1 values showed no correlation with CVF ( r = 0.311, P = 0.139). Conclusion: ECV has a very strong correlation with pathological CVF, and can be used to assess the degree of diffuse myocardial fibrosis better than the postcontrast T 1 value. Precontrast T 1 value has no significant correlation with diffuse myocardial fibrosis. J. Magn. Reson. Imaging 2016;44:1179–1185.