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Reproducibility of myocardial strain and left ventricular twist measured using complementary spatial modulation of magnetization
Author(s) -
Swoboda Peter P.,
Larghat Abdulghani,
Zaman Arshad,
Fairbairn Timothy A.,
Motwani Manish,
Greenwood John P.,
Plein Sven
Publication year - 2014
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.24223
Subject(s) - reproducibility , twist , strain (injury) , materials science , modulation (music) , nuclear magnetic resonance , magnetization , cardiology , medicine , biomedical engineering , physics , mathematics , acoustics , magnetic field , statistics , geometry , quantum mechanics
Purpose To establish the reproducibility of complementary spatial modulation of magnetization (CSPAMM) tagged cardiovascular MR (CMR) data in normal volunteers. Materials and Methods Twelve healthy volunteers underwent CMR studies on two separate occasions using an identical CSPAMM pulse sequence with images acquired in three short axis slices. Data were analyzed by two independent observers using harmonic phase analysis (HARP). Lagrangian circumferential and radial strain, rotation, and left ventricular twist were calculated. Results The intraobserver reproducibility of circumferential strain (CoV [coefficient of variation] 1.5–4.3%) and LV twist (CoV 1.2–4.4%) was better than radial strain (CoV 10.6–14.8%). For interobserver reproducibility, circumferential strain (CoV 3.5–6.2%) and LV twist (CoV 3.5–7.2%) were more reproducible than radial strain (CoV 11.8–21.8%). Interstudy reproducibility of circumferential strain (CoV 3.7–5.5%) and LV twist (CoV 9.8–12.2%) were good but radial strain (CoV 13.8–23.4%) but showed poorer interstudy reproducibility. Sample size calculations suggested 20 or fewer subjects are needed to detect a 10% change in circumferential strain (power 90%; α error 0.05), whereas for twist, 66 subjects would be required. Conclusion In normal volunteers, the intraobserver, interobserver, and interstudy reproducibility of circumferential strain and LV twist measured from CSPAMM tagged CMR data are good, but are less so for radial strain. J. Magn. Reson. Imaging 2014;39:887–894. © 2013 Wiley Periodicals, Inc .