Left Ventricular Segmentation, Warping, and Myocardial Registration for Automated Strain Measurement

Kuo‐Feng Huang1, Donna Shu‐Han Lin2, Geng-Shi Jeng3, Ting‐Tse Lin4, Lian‐Yu Lin4, Chih‐Kuo Lee5, Lung-Chun Lin4
1Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
2Division of Cardiology, Department of Internal Medicine, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan
3Institute of Electronics, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
4Section of Cardiology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
5National Taiwan University Hospital Hsin-Chu Branch, HsinChu, Taiwan

Tóm tắt

AbstractThe left ventricular global longitudinal strain (LVGLS) is a crucial prognostic indicator. However, inconsistencies in measurements due to the speckle tracking algorithm and manual adjustments have hindered its standardization and democratization. To solve this issue, we proposed a fully automated strain measurement by artificial intelligence-assisted LV segmentation contours. The LV segmentation model was trained from echocardiograms of 368 adults (11,125 frames). We compared the registration-like effects of dynamic time warping (DTW) with speckle tracking on a synthetic echocardiographic dataset in experiment-1. In experiment-2, we enrolled 80 patients to compare the DTW method with commercially available software. In experiment-3, we combined the segmentation model and DTW method to create the artificial intelligence (AI)-DTW method, which was then tested on 40 patients with general LV morphology, 20 with dilated cardiomyopathy (DCMP), and 20 with transthyretin-associated cardiac amyloidosis (ATTR-CA), 20 with severe aortic stenosis (AS), and 20 with severe mitral regurgitation (MR). Experiments-1 and -2 revealed that the DTW method is consistent with dedicated software. In experiment-3, the AI-DTW strain method showed comparable results for general LV morphology (bias − 0.137 ± 0.398%), DCMP (− 0.397 ± 0.607%), ATTR-CA (0.095 ± 0.581%), AS (0.334 ± 0.358%), and MR (0.237 ± 0.490%). Moreover, the strain curves showed a high correlation in their characteristics, with R-squared values of 0.8879–0.9452 for those LV morphology in experiment-3. Measuring LVGLS through dynamic warping of segmentation contour is a feasible method compared to traditional tracking techniques. This approach has the potential to decrease the need for manual demarcation and make LVGLS measurements more efficient and user-friendly for daily practice.

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