Influence of contrast agent and spatial resolution on myocardial strain results using feature tracking MRI

Knobelsdorff-Brenkenhoff, Florian von; Schunke, Tobias; Reiter, Stephanie; Scheck, Roland; Höfling, Berthold und Pilz, Günter (2020): Influence of contrast agent and spatial resolution on myocardial strain results using feature tracking MRI. In: European Radiology, Bd. 30, Nr. 11: S. 6099-6108

Abstract

Objectives: Feature tracking for assessing myocardial strain from cardiac magnetic resonance (CMR) cine images detects myocardial deformation abnormalities with prognostic implication, e.g., in myocardial infarction and cardiomyopathy. Standards for image acquisition and processing are not yet available. Study aim was analyzing the influence of spatial resolution and contrast agent on myocardial strain results. Methods: Seventy-five patients underwent CMR for analyzing peak systolic circumferential, longitudinal, and radial strain. Group A includedn = 50 with normal left ventricular ejection fraction, no wall motion abnormality, and no fibrosis on late enhancement imaging. Group B includedn = 25 with chronic myocardial infarct. For feature tracking, steady-state free precession cine images were acquired repeatedly. (1) Native standard cine (spatial resolution 1.4 x 1.4 x 8 mm(3)). (2) Native cine with lower spatial resolution (2.0 x 2.0 x 8 mm(3)). (3) Cine equal to variant 1 acquired after administration of gadoteracid. Results: Lower spatial resolution was associated with elevated longitudinal strain (- 21.7% vs. - 19.8%;p < 0.001) in viable myocardium in group A, and with elevated longitudinal (- 17.0% vs. - 14.3%;p = 0.001), circumferential (- 18.6% vs. - 14.6%;p = 0.002), and radial strain (36.8% vs. 31.0%;p = 0.013) in infarcted myocardium in group B. Gadolinium administration was associated with reduced circumferential (- 21.4% vs. - 22.3%;p = 0.001) and radial strain (44.4% vs. 46.9%;p = 0.016) in group A, whereas strain results of the infarcted tissue in group B did not change after contrast agent administration. Conclusions: Variations in spatial resolution and the administration of contrast agent may influence myocardial strain results in viable and partly in infarcted myocardium. Standardized image acquisition seems important for CMR feature tracking.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Medizin
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 0938-7994
• Sprache: Englisch