Figure 1.
Workflow of our segmentation algorithm.
LVOT: left ventricular outflow tract.
Figure 2.
Segment a slice image using LBF model: (a) ROI of the gray image, (b) result of LBF model, (c) contour of blood pool by LBF model, (d) segment result, (e) segmented blood pool.
Figure 3.
Get endocardial contour of the basal slice image with LVOT in some cases: (a) ROI of the gray image, (b) binary image of the ROI, (c) blood pool of the preceding slice image, (d) endocardial contour of the current slice image, (e) segment result of the current slice image, the solid white curve indicates the endocardial contour.
Table 1.
Results on 45 studies.
Figure 4.
Regression curve and Bland-Altman plot for the ejection fraction (EF) and left ventricle (LV) mass: (a) linear regression for LV mass, (b) Bland-Altman plots of LV mass, (c) Linear regression for EF, (d) Bland-Altman plots of EF.
Table 2.
Compare contour accuracy in Huang's, our previous and present results.
Table 3.
Compare percentage of good contours among Lu's, Wijnhout's and our results in the second dataset.
Figure 5.
Some segmentation outputs from 9 studies with LVOT by our method; for each case, four images are shown.
The left ones are the gray image and its segmentation results from the ES phase; the right ones are derived from the ED phase. The names below the image data are from the data source. The dashed blue curves indicate our contours; while the solid red ones are the ground truth. The epicardial contours are not drawn by experts in the ES phase (cropped for better viewing).
Figure 6.
Endocardial contours of two slice images from case SC-HF-I-09 and SC-HF-I-40.
The blue curves are obtained using our present algorithm, whereas the green ones are from our previous method. The red curves are the ground truth.
Figure 7.
Endo- and epi-cardial contours from 3 cases derived from two methods.
For each case, two images are shown. The left one is the segmentation result from our previous method; while the right one is derived from our present algorithm. The ground truth from experts is drawn in solid red curve; whereas the dashed blue one represents the results of our previous or present method.