Strain-encoding cardiovascular magnetic resonance for assessment of right-ventricular regional function

Abstract

Background: Tissue tagging by cardiovascular magnetic resonance (CMR) is a comprehensive method for the assessment of cardiac regional function. However, imaging the right ventricle (RV) using this technique is problematic due to the thin wall of the RV relative to tag spacing which limits assessment of regional function using conventional in-plane tagging.

Cardiac magnetic resonance imaging-based myocardial strain study for evaluation of cardiotoxicity in breast cancer patients treated with trastuzumab: A pilot study to evaluate the feasibility of the method

“…LV longitudinal strain was measured at the basal, middle, and apical levels of the short-axis view; a region of interest was plotted in the myocardial middle-layer of each myocardial segment and the minimum value during systole (i.e., peak systolic strain) was recorded. Using the same images, RV longitudinal and circumferential strains were measured in regions of interest plotted in the RV free wall using a method modified from a previous report [20]. Global strain was defined as the mean peak systolic strain of all allocated segments (16 segments for LV longitudinal strain, 6 for circumferential strain, Figure 1.…”

Cardiovascular MR Imaging after Surgical Correction of Tetralogy of Fallot: Approach Based on Understanding of Surgical Procedures

“…Quantification of the wall motion during the cardiac cycle is usually performed for multiple segments of the right ventricle and is expressed in millimeters per cycle. Tagging sequences can also be used to detect regional right ventricular wall motion abnormalities (38).…”

Evaluation of Right Ventricular Function

“…This technique has performed poorly in the right ventricle until recently because in order to permit a sufficient volume of the right ventricle to be magnetized and "tagged," large patches of right ventricle were needed to compensate for the thin RV free wall, reducing resolution. However, new tissue tagging techniques have permitted extension of MRI strain encoding to RV imaging [38,39].…”