The potential role of feature tracking in adult congenital heart disease: advantages and disadvantages in measuring myocardial deformation by cardiovascular magnetic resonance
Journal of Congenital Cardiology volume 2, Article number: 3 (2018)
Cardiac magnetic resonance (CMR) imaging has several advantages over other imaging modalities in adult patients with congenital heart disease. Limitations remain however, in the assessment of myocardial function based on volumetric methods. There is increasing evidence in a range of diseases that myocardial strain is a more sensitive measure of regional and global ventricular contractile function.
Feature tracking (FT), is a CMR-based method that measures strain without the need for additional sequence acquisition which can be analyzed rapidly, opening the possibility of use in adult congenital heart disease (ACHD). The aim of this review is to outline the technique of FT-CMR, its advantages and disadvantages compared to other techniques, review the values obtained, and to outline the preliminary data in support of its use in ACHD. In short, FT is a semi-automated post-processing technique that can be performed on routinely acquired images and thereby does not prolong scan time, is reproducible and not overly time-consuming. Although FT-CMR promises much, inevitably there remain limitations. While FT has excellent spatial resolution, temporal resolution is sub-optimal relative to speckle tracking echocardiography.
FT-CMR is an emerging technique of measuring the myocardial strain that is comparable to speckle tracking echocardiography and the gold standard myocardial tagging CMR. FT-CMR derived strain parameters have potential diagnostic, risk stratification and prognostic value in the growing ACHD population.
Patients with adult congenital heart disease (ACHD) are an ever-growing population which require long-term and frequently lifelong, follow-up. Investigations used to identify progression of existing disease, complications from previous surgery and new symptoms must deliver good quality information at low risk to the patient, with high reproducibility when used repeatedly over time. Cardiovascular magnetic resonance (CMR) imaging has a number of advantages over other imaging modalities, including high resolution imaging without limitation by acoustic window, low risk to the patient, and reproducible measurement of left-sided volumes and ejection fraction . Although well established, issues remain in routine clinical practice. Firstly, repeatable measurements of right ventricular size and function by CMR can be time consuming, difficult to achieve, require dedicated software and a meticulous and clearly defined technique . Secondly, while left (LV) and right ventricular ejection fraction (EF) are common markers of systolic function that carry prognostic weight, these lack sensitivity and appear to be late indicators of pump failure, particularly in ACHD where co-existing lesions that alter loading conditions are common .
There is increasing evidence in the general adult population that myocardial deformation is a more sensitive, quantitative evaluation of global contractile function that can detect changes in ventricular function before a fall in EF . Moreover, myocardial deformation (strain, torsion and dyssynchrony) can also deliver quantitative evaluation of regional function. The most frequently used index is strain, which measures the percent change in myocardial length from a resting state to one after application of stress or force. Echocardiography derived strain has been shown in multiple studies to deliver incremental prognostic benefit to clinical assessment and to EF both in community and hospital-based populations . Much of the evidence relating to measurement of strain in adult congenital heart disease (ACHD) has been derived from echocardiography and hitherto, the role of CMR has been limited, as this previously required the acquisition of additional ‘tagging’ sequences and time-consuming analysis. The development of feature tracking CMR (FT-CMR), has allowed measurement of deformation using standard steady state free precession (SSFP) cine sequences which are standard in most protocols in ACHD . Moreover, the results can be analyzed quickly in a semi-automated fashion using a number of software systems, including Diogenes and Cardiac Performance Analysis MR-software (TomTec, Germany), Toshiba (Tokyo, Japan) and Circle CVi42 (Calgary, Canada). The aim of this review is to outline the basic principles of FT-CMR, its advantages and disadvantages compared to other techniques, and to outline the potential clinical applications in ACHD.
The technique of feature-tracking CMR
FT-CMR is based on optical flow technology and tracks different elements at the boundary between the cavity and myocardium, using a maximum likelihood methodology that measures displacement of a peculiar pattern in an initial image (for example, the endocardial border) and then recognizes this pattern within a second image taken moments later. There are a number of steps to produce the required data. The first step is to ensure that good quality SSFP cines are acquired, with attention to end-expiratory breath-holding and a stable cardiac rhythm that is gated accurately over a high number of phases (25). Following acquisition, either the endocardial or endocardial and epicardial borders are traced in the frame with the greatest clarity between cavity and myocardium, usually end-diastole, with exclusion of the papillary muscles and the trabeculae . The automated software algorithm is then activated and starts by tracking a feature in 1-dimension over one cardiac cycle in a direction orthogonal to the border (detecting motion inwards and outwards like an M-mode) and then in 2-dimensions using a search window frame by frame (See Figs. 1 and 2). The features tracked on CMR are those of different signal intensity at the border between myocardium and blood pool, rather than the motion of individual pixels or group of pixels as is done on echocardiography. In a long axis view, the longitudinal displacement of the atrioventricular junction is first detected, followed by the entire border from base to apex according to the motion of the AV junction. The algorithm is hierarchical, in that the 2-dimension search window is then reduced and becomes smaller at each step (at least 8 × 8 pixels.) . The technical steps involved in 2D FT-CMR help to explain the difference in the results from 2D speckle tracking echocardiography (STE), which relate in part to which region of the myocardium is tracked. 2D STE tracks the speckles within the myocardium itself; however, 2D FT-CMR tracks the endocardial and epicardial borders but cannot distinguish features within the compact myocardium . Strain in each direction is then calculated by the change in distance between points, and strain rate based on rate of change in distance [See attached Additional files 1, 2 and 3].
Advantages and disadvantages of FT-CMR
The advantage of SSFP cine imaging compared to 2D and 3D echocardiography – and thereby the advantage of FT-CMR over STE - is that it provides an excellent contrast between blood pool and the myocardium and produces good image quality more reliably without limitation by acoustic window . This is particularly important in congenital heart disease patients, many of whom have had multiple previous surgeries and scars with Goretex membrane or chest deformities leading to difficult windows. For example, in a study of 15 adult Fontan (single ventricle) patients at least one myocardial segment could not be assessed by STE in 63% of the cohort, although all segments could be assesssed by FT-CMR . The major advantage of FT-CMR over tagging CMR methods for analysis of deformation, such as spatial modulation of magnetization (SPAMM) and the complementary SPAMM (C-SPAMM), is that no additional sequences are required see Fig. 3. Moreover, these sequences have been hampered by the gradual disappearance of the tags with time, reducing the ability to analyse diastolic parameters . Although tagging is considered the gold standard noninvasive imaging technique for strain quantification and has been validated against sonomicrometry in humans  and non-homogenous strain phantoms , a huge volume of data is created that is time-consuming to analyze, so it has failed to enter routine clinical usage.
The main limitation of FT-CMR is that, while FT has excellent spatial resolution, temporal resolution is dependent on heart rate and is lower than the temporal resolution of 2D STE  (Table 1). Temporal averaging with FT-CMR means that strain values tend to be lower than STE and limits the application where cardiac rhythm is irregular or if there are beat-to-beat differences in image stability and quality. All tracking techniques, whether STE or FT-CMR (2D or 3D), are more robust when studying global compared to regional contractile function . Furthermore, all 2D techniques share a susceptibility to through plane motion, when a feature cannot be tracked as it moves out of the image slice. 3D FT-CMR can potentially overcome this but as these methods currently rely on a short axis stack, the resolution may be even worse in the through-plane long axis, depending on the number of images acquired in this plane . As a general rule in feature-tracking, integral variables, such as displacement and strain, are more reliable than differential ones, including velocity and strain rate. In particular, temporal resolution is such that rapid myocardial events such as isovolumic time intervals are not reliable.
One of the potential advantages of FT-CMR in the ACHD population is that this can also deliver quantification of myocardial deformation in the right ventricle and right atrium without limitation by acoustic window. Assessment of right ventricular performance is key for the follow up of many ACHD conditions such as Tetralogy of Fallot and those conditions with an RV-PA conduit. Although STE is increasingly used in ACHD and has excellent feasibility and reproducibility in the assessment of RV strain in healthy individuals , this is not always the case in patients with complex congenital disease. For example, patients with univentricular hearts and systemic right ventricles have been excluded from studies at major ACHD centers due to difficulties in acquisition and standardization of analysis . Therefore FT-CMR may provide further insights into potential markers for arrhythmias, exercise limitation as well as morbidity and mortality, although further work is needed. Table 2 outlines the normal ranges for these.
Feature-tracking CMR: Validation and comparison to other techniques
FT-CMR has been validated against artificially-prepared phantom images with minimal error from theoretical values for strain and strain rate , although the technique has yet to be validated against the clinical gold standard sonomicrometry (a technique that involves measurement of the speed of acoustic signals between crystals embedded in the tissue under study and which is highly invasive).
FT-CMR and tagging
FT-CMR has been validated against tagged harmonic phase analysis (HARP) in 191 subjects with Duchenne muscular dystrophy suffering from a range of cardiac dysfunction for peak circumferential strain (− 12.16 ± 3.12% vs − 12.52 ± 2.69%, r = 0.899) . Agreement between FT-CMR and tagging however, is not perfect. In general, results for FT-CMR are more reliable for circumferential and longitudinal strain than for radial strain, which is thought to be due to the need to track tissue interfaces for radial strain as opposed to the cavity-myocardial interface. For example, in a study comparing FT-CMR with tagged SPAMM, Moody et al. found good agreement in calculating peak global circumferential strain (− 22.7 ± 6.2% vs. -22.5 ± 6.9%, bias 0.2 ± 4.0%) and peak global longitudinal strain (− 18.1 ± 5.0% vs. -16.7 ± 4.8%, bias 1.3 ± 3.8%) but poor agreement for radial strain .
FT-CMR and STE
Likewise, inter-modality agreement between FT-CMR and STE is closest for global longitudinal strain (GLS), then global circumferential strain (GCS) and worst for global radial strain (GRS), with lower values obtained by FT-CMR for the latter two parameters. For example, Obotaka studied 106 patients who completed FT-CMR and both 2D and 3D STE on the same day, obtaining similar results for GLS (r = 0.83 for 2D STE; 0.87 for 3D STE) with the limits of agreement (LOA) ranging from ±3.6 to ±4.9%. Similar results were obtained for GCS (r = 0.90 for 2D STE; 0.88 for 3D STE) with LOA ±6.8–8.5%. The correlations for GRS were significantly worse (r = 0.69 for 2D STE; 0.82 for 3D STE) with wide LOA ranging from ±12.4 to ±16.3% . This study replicated findings from others that FT-CMR can be measured succesfully in almost all patients (98%) , which is particularly important in the ACHD population where adequate image quality for reliable analysis of myocardial deformation may be more difficult to obtain by echocardiography.
A major issue for quantifying myocardial function in ACHD is that intra-modality reproducibility must be high, so that clinicians can depend on differences in results between annual scans as reflecting pathophysiological change. Ghelani et al. compared the results from 134 paired studies of functional single ventricles in the Fontan circulation performed less than 1 year apart, 60 with dominant right and 74 with dominant left ventricles. Intra- modality inter-observer agreement for FT-CMR was similar to STE (FT-CMR GCS Rc = 0.94 vs STE Rc = 0.84; FT-CMR GLS Rc = 0.75 vs STE 0.79), with similar correlations for intra-modality intra-observer measurements .
In summary, FT-CMR has high feasibility, good reproducibility for GCS and GLS but less optimal results for GRS, and there may be differences in results between modalities that mean long-term assessment of ACHD patients should consistently use one technique for serial follow-up. It is also important to note that there are also likely to be differences in results according to the software used for calculation of FT-CMR, similar to the issues that bedevilled STE . Table 3 demonstrates differences in the normal ranges for 2D FT-CMR for GLS, GCS and GRS for the LV between different software manufacturers.
Value of feature tracking CMR in adult congenital heart disease
The number of adults with congenital heart disease has significantly increased and now outnumbers the tally of paediatric cardiology patients . The median survival of ACHD patients has shifted from the neonatal period to reflect that of the general population . The major focal point of serial imaging has also shifted, with emphasis on arrhythmia, sudden cardiac death and overall prognosis, early detection of ventricular dysfunction and correlation with reduction in exercise capacity. The number of publications in these areas using FT-CMR has accelerated, and currently published studies in ACHD are summarized in Table 4. The most important of these are summarized in more detail under the following areas:
Prediction of arrhythmia, sudden cardiac death and overall mortality
Patients with repaired tetralogy of Fallot (ToF) develop right and left ventricular dysfunction and may be at high risk of adverse outcomes including sudden cardiac death. Risk stratification for these patients is challenging [22, 23] but FT-CMR may be helpful. Two preliminary, small studies of patients following early repair of ToF suggested that the maximum time to peak circumferential strain in the LV  and impaired GLS and GCS of both the LV and RV were strongly associated with death and sustained ventricular tachycardia [24, 25]. These findings were then confirmed in a larger prospective, multicenter study of 372 patients with repaired ToF by Orwat et al. , with reduced LV and RV GLS predicting the coprimary outcome of death, successful resuscitation or ventricular tachycardia.
Correlation with a reduction in exercise capacity
In a number of studies across a range of adults with differing congenital heart diseases, a consistent association has been found between impaired strain and reduced exercise capacity on formal testing. Schmidt et al.  investigated both STE and FT-CMR in a small group of adult Fontan patients (n = 15 STE and 13 FT-CMR, mean age 27 ± 7 years) and found an association between impaired systemic ventricular GLS & GCS and NYHA status and peak oxygen uptake (r = 0.71 and p = 0.046 for GLS). Similarly, Kempny et al.  found that FT-CMR RV strain was related to exercise capacity in a population of 28 repaired Tetralogy of Fallot patients (mean age 40 ± 13 years), with correlation between peak oxygen uptake and RV radial strain (r = 0.49, p = 0.02) and VE/VC02 slope with RV GRS and GCS (r = − 0.54, p = 0.01, and r = − 0.56, p = 0.008, respectively). In a larger study of 91 adult patients (mean age 30 ± 5.1 years) following atrial repair of transposition of the great arteries (TGA), Tutarel et al.  found that LV GLS again correlated with peak VO2 (r = − 0.4, p < 0.001). A long term aim of non-invasive imaging has been the ability to predict onset of symptoms in those cardiovascular diseases where this is a trigger for intervention and in this respect, LV and RV FT-CMR offers some hope.
Detection of impaired ventricular function
Impaired systolic ventricular function is also a common trigger for intervention but awaiting fall in ejection fraction often results in worse outcome. Several studies, thereby reflecting the results of STE strain in many other common cardiovascular conditions, have found that altered deformation on FT-CMR is a sensitive measure of myocardial function in ACHD that can detect change in contractility before fall in EF. For example, Steinmetz et al.  have recently investigated FT-CMR in 31 Ebstein patients (mean age 31.6+/− 16.9 years) and 31 matched controls and found LV dyssynchrony which was more pronounced in patients with a higher NYHA class (circumferential systolic dyssynchrony index, r = 0.529, p = 0.004), BNP value (r = 0.436, p = 0.018) or higher R/L volume index (r = 0.419, p = 0.019). Liu et al.  also detected impaired LV GLS, GCS and GRS in Ebstein’s patients compared to controls, that were thought may predict later onset systolic dysfunction.
The future for FT-CMR in adult congenital heart disease?
Although FT-CMR offers much potential, challenges remain. Much of the data relating to FT-CMR comes from smaller case-control or cohort studies and there is a need to define the additional value of this technique in predicting prognosis compared to other useful parameters. These studies ideally need to be performed in larger, longitudinal cohorts in which the incremental benefits of this technique can be demonstrated, particularly in relation to cost-efficacy. In addition to studies on prognosis, a major area in ACHD is the appropriate and timely selection of those patients suitable for treatment, for example in device therapy using indices such as the circumferential (CURE) and radial (RURE) uniformity ratio estimates based on myocardial strain . The technique of FT-CMR is currently hampered by limitations due to the temporal resolution of SSFP cine imaging and by reduced reliability in the assessment of radial strain. 3D volumes have the potential to reduce these limitations, providing these can be delivered with sufficient resolution.
FT-CMR is a simple, fast method for measurement of myocardial deformation that offers promise for quantifying function of both ventricles and atria. Results are similar to other methods for quantifying deformation, although are most reliable when measuring displacement and strain, specifically LV GCS and GLS. Early studies of FT-CMR derived strain parameters correlate with prognosis and exercise capacity in some ACHD populations. FT-CMR derived strain parameters have further potential diagnostic and prognostic value in the adult congenital heart disease patient population and warrant further study. Early published data is largely based on relatively small selected groups of patients and long term prospective collaborative multi-centre follow up studies of the role of FT-CMR in ACHD patients are warranted.
Adult Congenital Heart Disease
Congenital heart disease
Cardiovascular magnetic resonance
Complementary spatial modulation of magnetization
Circumferential uniformity ratio estimate
Circle cardiovascular imaging
Dextro-transposition of the great arteries
Peak systolic circumferential strain
Peak systolic longitudinal strain
Peak systolic radial strain
Global circumferential strain
Global longitudinal strain
Tagged harmonic phase
Horizontal long axis
Limits of agreement
Left ventricular end diastolic dimension
New York Heart Association
Concordance correlation coefficient
Radial uniformity ratio estimate
Right ventricular end diastolic dimension
Spatial modulation of magnetization
Steady State free precession
Speckle tracking echo
Tricuspid annular plane systolic excursion
Tetralogy of fallot
Ventricular septal defect
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We thank Dr. Shanat Baig and Dr. Manvir K Hayer for their comments and support.
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LV FT-CMR in HLA. Horizontal long axis cine image illustrates the FT-CMR of the left ventricle. Myocardial points are displayed in yellow color. (AVI 1218 kb)
LV FT-CMR in the SA. Left ventricle short axis cine image at the mid-ventricular level. Endocardial and epicardial boundaries points are displayed in red and green colors respectively. (AVI 1167 kb)
RV FT-CMR in Ebstein’s anomaly. Horizontal long axis cine image illustrates the FT-CMR of the functional right ventricle in a case of Ebstein’s anomaly. Myocardial points are displayed in yellow color. (AVI 599 kb)
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Dardeer, A.M., Hudsmith, L., Wesolowski, R. et al. The potential role of feature tracking in adult congenital heart disease: advantages and disadvantages in measuring myocardial deformation by cardiovascular magnetic resonance. J Congenit Heart Dis 2, 3 (2018). https://doi.org/10.1186/s40949-018-0015-0
- Cardiac magnetic resonance
- Feature tracking
- Adult congenital heart disease