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  • Title: Feasibility and accuracy of different techniques of two-dimensional speckle based strain and validation with harmonic phase magnetic resonance imaging.
    Author: Bansal M, Cho GY, Chan J, Leano R, Haluska BA, Marwick TH.
    Journal: J Am Soc Echocardiogr; 2008 Dec; 21(12):1318-25. PubMed ID: 19041575.
    Abstract:
    BACKGROUND: Different 2-dimensional speckle-based strain techniques have been developed to overcome the problem of angle dependency with Doppler-based strain. However, their relative accuracy has not been assessed. The aim of this study was to determine the feasibility and accuracy of 2 such techniques (velocity vector imaging [VVI] and automated function imaging [AFI]), using tagged harmonic phase (HARP) magnetic resonance imaging (MRI) as a reference standard. METHODS: Thirty patients with known or suspected ischemic heart disease underwent measurement of peak systolic longitudinal, radial, and circumferential Lagrangian strain with all 3 techniques using a 16-segment model. The extent of scar tissue in each segment was determined using contrast-enhanced MRI. RESULTS: The measurement of myocardial strain in all 3 directions was highly feasible with both VVI and AFI. Longitudinal strain was underestimated by both VVI (-11 +/- 8%; P < .01) and AFI (-12 +/- 6%; P < .01) in comparison with HARP MRI (-14 +/- 5%), and radial strain was underestimated by VVI (14 +/- 18% vs 23 +/- 7%; P < .01). All strain measurements with AFI showed better correlation and agreement with HARP MRI compared with VVI. Circumferential strain with AFI had the greatest accuracy (area under the receiver operating characteristic curve = 0.74, P < .001) for the prediction of scar tissue on MRI. CONCLUSIONS: Two-dimensional strain measured with AFI has significantly better accuracy than VVI. Circumferential strain with AFI has the best discriminative ability for the detection of regional myocardial dysfunction.
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