Normal myocardial native T
1 values in children using single-point saturation recovery and modified look-locker inversion recovery (MOLLI).
J Magn Reson Imaging 2019;
51:897-903. [PMID:
31507010 DOI:
10.1002/jmri.26910]
[Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Accepted: 08/12/2019] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND
T1 mapping is useful to quantify diffuse myocardial processes such as fibrosis, edema, storage disorders, or hemochromatosis. Normal pediatric myocardial T1 values are scarce using modified Look-Locker inversion recovery (MOLLI) sequences and unavailable using Smart1Map, a single-point saturation recovery sequence that measures true T1 .
PURPOSE/HYPOTHESIS
To establish normal pediatric myocardial T1 values by Smart1Map and to compare them with T1 by MOLLI.
STUDY TYPE
Prospective cohort study.
SUBJECTS
Thirty-four children and adolescents aged 8-18 years (14 males) without cardiovascular or inflammatory diseases.
FIELD STRENGTH/SEQUENCES
1.5T, MOLLI, Smart1Map.
ASSESSMENT
Mean T1 values of the left ventricular myocardium, the interventricular septum, and the blood pool were measured with MOLLI and Smart1Map in basal, mid-ventricular, and apical short axis slices.
STATISTICAL TESTS
T1 values were compared between locations and methods by paired samples t-tests, Wilcoxon signed ranks test, repeated-measures analysis of variance (ANOVA), or Friedman's test. Pearson's correlation coefficient was calculated. For interobserver variability, intraclass correlation coefficients and coefficients of variation were calculated, and Bland-Altman analyses were performed.
RESULTS
T1 values were longer by Smart1Map than by MOLLI in all measured locations (myocardium: 1191-1221 vs. 990-1042 msec; all P < 0.001). T1 in basal vs. mid-ventricular slices differed both by MOLLI and by Smart1Map for myocardium and for blood (all P < 0.001). Myocardial T1 did not correlate with age, heart rate, right or left ventricular ejection fraction (all P > 0.05) by either method. Septal vs. total myocardial T1 values in each slice did not differ by MOLLI (basal P = 0.371; mid-ventricular P = 0.08; apical P = 0.378) nor by Smart1Map (basal P = 0.056; mid-ventricular P = 0.918; apical P = 0. 392), after artifacts had been carefully excluded.
DATA CONCLUSION
We established pediatric normal native T1 values using the Smart1Map sequence and compared the results with T1 mapping with MOLLI. Septal T1 values did not differ from total myocardial T1 values in each of the myocardial slices.
LEVEL OF EVIDENCE
2 Technical Efficacy: Stage 2 J. Magn. Reson. Imaging 2020;51:897-903.
Collapse