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2D/3D fetal cardiac dataset segmentation using a deformable model

Authors
Publisher
American Association of Physicists in Medicine
Publication Date
Keywords
  • F350 Medical Physics
  • G740 Computer Vision
Disciplines
  • Computer Science

Abstract

Purpose: To segment the fetal heart in order to facilitate the 3D assessment of the cardiac function and structure. Methods: Ultrasound acquisition typically results in drop-out artifacts of the chamber walls. The authors outline a level set deformable model to automatically delineate the small fetal cardiac chambers. The level set is penalized from growing into an adjacent cardiac compartment using a novel collision detection term. The region based model allows simultaneous segmentation of all four cardiac chambers from a user defined seed point placed in each chamber. Results: The segmented boundaries are automatically penalized from intersecting at walls with signal dropout. Root mean square errors of the perpendicular distances between the algorithm's delineation and manual tracings are within 2 mm which is less than 10% of the length of a typical fetal heart. The ejection fractions were determined from the 3D datasets. We validate the algorithm using a physical phantom and obtain volumes that are comparable to those from physically determined means. The algorithm segments volumes with an error of within 13% as determined using a physical phantom. Conclusions: Our original work in fetal cardiac segmentation compares automatic and manual tracings to a physical phantom and also measures inter observer variation.

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