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Automatic aortic valve landmark localization in coronary CT angiography using colonial walk

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Fig 1. The aortic valve anatomy. (a) Rendered CT volume after thresholding to visualize the aortic valve
Fig 2. View customization for manually marking the landmarks and diagnosing. (a) Original view
Fig 3. The voxel difference feature at x. The yellow dot refers to x i.e., the sample that needs to calculate the feature.
Fig 6. The proposed two-phase model for learning the aortic valve landmarks. (a) A representative point inside the valve area is detected in the global phase
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