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Novel technique of strain assessment utilizing feature tracking in nontagged SSFP images: validation with tagged strain analysis
Journal of Cardiovascular Magnetic Resonancevolume 11, Article number: P33 (2009)
Recent cardiac MRI (CMR) studies have demonstrated decline in left ventricular peak circumferential strain (εcc) despite normal ejection fraction in Duchenne muscular dystrophy (DMD) patients. However, these analyses used CMR tagging, a technique limited by tag fading and complicated analysis requirements. Feature tracking software has recently been developed for analysis of εcc from non-tagged standard steady-state free precession (SSFP) cine CMR images.
The purpose of this study was to compare Mid-LV slice εcc by feature tracking of SSFP cine CMR images to HARP analysis of tagged images.
εcc was assessed from CMR SSFP short-axis cine stack images and cine myocardial tagged image data of 54 DMD patients and 6 aged-matched control subjects, utilizing both tagged analysis (via HARP® software, Diagnosoft Inc) and SSFP feature tracking (via DIOGENES® software, TomTec Inc) methods. Analyses were performed on identical location mid-papillary LV slices (both tagged and standard SSFP). Average εcc was tabulated and compared via Spearmen rank correlation and Bland-Altman comparison of methods.
CMR feature tracking is a feasible method for assessment of εcc. Further study on larger subject groups is warranted to determine efficacy and accuracy of feature tracking versus tagged analysis.