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Surface–length index: a novel index for rapid detection of right ventricles with abnormal ejection fraction using cardiac MRI

Abstract : OBJECTIVE: To validate a new index, the surface-length index (SLI) based on area change in a short-axis view and length reduction in the horizontal long-axis view, which is used to quickly (<1 min) detect right ventricles with an abnormal ejection fraction (EF) during a cardiac MRI examination. SLI can be used to avoid a complete delineation of the endocardial contours of normal right ventricles. METHODS: Sixty patients (group A) were retrospectively included to calibrate the SLI formula by optimisation of the area under the ROC curves and SLI thresholds were chosen to obtain 100 % sensitivity. Another 340 patients (group B) were prospectively recruited to test SLI's capacity to detect right ventricles (RVs) with an abnormal EF (<0.5). RESULTS: The appropriate threshold to obtain 100 % sensitivity in group A was 0.58. In group B, with the 0.58 threshold, SLI yielded a sensitivity of 100 % and specificity of 51 %. SLI would have saved 35 % of the RV studies in our population, without inducing any diagnostic error. SLI and EF correlation was good (r (2) = 0.64). CONCLUSION: SLI combines two simple RV measures, and brings significant improvement in post-processing efficiency by preselecting RVs that require a complete study.
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https://hal.univ-lorraine.fr/hal-01718719
Contributor : Iadi Ul <>
Submitted on : Tuesday, February 27, 2018 - 3:55:58 PM
Last modification on : Tuesday, October 13, 2020 - 10:45:28 AM

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Laurent Bonnemains, Damien Mandry, Anne Menini, Bertrand Stos, Jacques Felblinger, et al.. Surface–length index: a novel index for rapid detection of right ventricles with abnormal ejection fraction using cardiac MRI. European Radiology, Springer Verlag, 2013, 23 (9), pp.2383 - 2391. ⟨10.1007/s00330-013-2851-9⟩. ⟨hal-01718719⟩

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