Feature tracking cardiac magnetic resonance imaging: A review of a novel non-invasive cardiac imaging technique

Table 1 Validation studies at glance

Ref.	Technique compared	Cardiac disease	Population studied (n)	Results of validation
Taylor et al[19]	-	Healthy individuals	55	FT is highly reproducible within operators, requiring a short analysis time
Augustine et al[4]	Myocardial tagging	Healthy individuals	145	FT measurements of circumferential strain showed reasonable agreement with myocardial tagging
Schuster et al[2]	-	Healthy individuals	20	FT showing reasonable intra-observer reproducibility in different groups of individuals
Lu et al[5]	HAARP	Anthracycline induced cardiomyopathy	26	Circumferential strain was found to be a robust and reproducible index of myocardial deformation
Hor et al[7]	HAARP	Duchenne muscular dystrophy	233	Good correlation between CMR-FT and HAARP for the mean circumferential strain values
Morton et al[8]	-	Healthy individuals	16	FT had good inter-study reproducibility for global strain analysis
Kempny et al[9]	STE and simple EBD	ToF	25	Feature tracking showed better inter observer reproducibility for circumferential or radial left ventricular and longitudinal right ventricular global strain when compared to STE
Padiyath et al[10]	2D echocardiography	20 patients with ToF and 20 healthy controls	40	Reasonable agreement between FT and 2D echo in measurement of global circumferential strain and global longitudinal strain for the left ventricle
Harrild et al[12]	Myocardial tagging	HCM	24	Closer agreement between 2 modalities in measuring time to peak strain
Orwat et al[13]	Trans-thoracic echocardiogram with speckle tracking	HCM	40	Trans-thoracic echocardiogram with speckle tracking. They found decent agreement between left ventricular longitudinal strain measurements between the 2 modalities while the agreement for circumferential strain not encouraging

HCM: Hypertrophic cardiomyopathy; EBD: Endocardial border delineation; STE: Speckle tracking echocardiography; ToF: Teratology of Fallot; HAARP: Harmonic phase imaging analysis; CMR-FT: Cardiac magnetic resonance feature tracking; FT: Feature tracking; 2D: 2-Dimensional.