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Correction with blood T1 is essential when measuring post-contrast myocardial T1 value in patients with acute myocardial infarction

 Eui-Young Choi  ;  Sung Ho Hwang  ;  Young Won Yoon  ;  Chul Hwan Park  ;  Mun Young Paek  ;  Andreas Greiser  ;  Hyemoon Chung  ;  Ji-Hyun Yoon  ;  Jong-Youn Kim  ;  Pil-Ki Min  ;  Byoung Kwon Lee  ;  Bum-Kee Hong  ;  Se-Joong Rim  ;  Hyuck Moon Kwon  ;  Tae Hoon Kim 
 Journal of Cardiovascular Magnetic Resonance, Vol.15(1) : 11-11, 2013 
Journal Title
 Journal of Cardiovascular Magnetic Resonance 
Issue Date
BACKGROUND: The aim of this study is to determine the test-retest reliability of the measurement of regional myocardial function by cardiovascular magnetic resonance (CMR) tagging using spatial modulation of magnetization. METHODS: Twenty-five participants underwent CMR tagging twice over 12 +/- 7 days. To assess the role of slice orientation on strain measurement, two healthy volunteers had a first exam, followed by image acquisition repeated with slices rotated +/-15 degrees out of true short axis, followed by a second exam in the true short axis plane. To assess the role of slice location, two healthy volunteers had whole heart tagging. The harmonic phase (HARP) method was used to analyze the tagged images. Peak midwall circumferential strain (Ecc), radial strain (Err), Lambda 1, Lambda 2, and Angle alpha were determined in basal, mid and apical slices. LV torsion, systolic and early diastolic circumferential strain and torsion rates were also determined. RESULTS: LV Ecc and torsion had excellent intra-, interobserver, and inter-study intra-class correlation coefficients (ICC range, 0.7 to 0.9). Err, Lambda 1, Lambda 2 and angle had excellent intra- and interobserver ICC than inter-study ICC. Angle had least inter-study reproducibility. Torsion rates had superior intra-, interobserver, and inter-study reproducibility to strain rates. The measurements of LV Ecc were comparable in all three slices with different short axis orientations (standard deviation of mean Ecc was 0.09, 0.18 and 0.16 at basal, mid and apical slices, respectively). The mean difference in LV Ecc between slices was more pronounced in most of the basal slices compared to the rest of the heart. CONCLUSIONS: Intraobserver and interobserver reproducibility of all strain and torsion parameters was excellent. Inter-study reproducibility of CMR tagging by SPAMM varied between different parameters as described in the results above and was superior for Ecc and LV torsion. The variation in LV Ecc measurement due to altered slice orientation is negligible compared to the variation due to slice location.Trial registration: This trial is registered as NCT00005487 at National Heart, Lung and Blood institute.
Appears in Collections:
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실)
1. Journal Papers (연구논문) > 1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실)
Yonsei Authors
권혁문(Kwon, Hyuck Moon) ; 김종윤(Kim, Jong Youn) ; 김태훈(Kim, Tae Hoon) ; 민필기(Min, Pil Ki) ; 박철환(Park, Chul Hwan) ; 윤영원(Yoon, Young Won) ; 윤지현(Yoon, Ji Hyun) ; 이병권(Lee, Byoung Kwon) ; 임세중(Rim, Se Joong) ; 최의영(Choi, Eui Young) ; 홍범기(Hong, Bum Kee) ; 황성호(Hwang, Sung Ho)
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