title: Segmentation and tracking of cytoskeletal filaments using open active contours.
abstract: We use open active contours to quantify cytoskeletal structures imaged by fluorescence microscopy in two and three dimensions. We developed an interactive software tool for segmentation, tracking, and visualization of individual fibers. Open active contours are parametric curves that deform to minimize the sum of an external energy derived from the image and an internal bending and stretching energy. The external energy generates (i) forces that attract the contour toward the central bright line of a filament in the image, and (ii) forces that stretch the active contour toward the ends of bright ridges. Images of simulated semiflexible polymers with known bending and torsional rigidity are analyzed to validate the method. We apply our methods to quantify the conformations and dynamics of actin in two examples: actin filaments imaged by TIRF microscopy in vitro, and actin cables in fission yeast imaged by spinning disk confocal microscopy.
authors.affiliation: Department of Physics, Lehigh University, Bethlehem, Pennsylvania 18015, USA.
authors.forename: Matthew B
authors.initials: MB
authors.lastname: Smith
authors.forename: Hongsheng
authors.initials: H
authors.lastname: Li
authors.forename: Tian
authors.initials: T
authors.lastname: Shen
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Huang
authors.forename: Eddy
authors.initials: E
authors.lastname: Yusuf
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Vavylonis
mesh_terms: D003599:Cytoskeleton / Q000648:ultrastructure*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008856:Microscopy, Fluorescence / Q000379:methods*; D008962:Models, Theoretical; D010363:Pattern Recognition, Automated / Q000379:methods; D015203:Reproducibility of Results; D012984:Software
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