Prostate boundary segmentation from ultrasound images using 2D active shape models: Optimisation and extension to 3D

Authors:
Adam C. Hodge;Aaron Fenster;Dónal B. Downey;Hanif M. Ladak
Affiliations:
Department of Medical Biophysics, The University of Western Ontario, London, Ontario, Canada;Department of Medical Biophysics, The University of Western Ontario, London, Ontario, Canada and Imaging Research Laboratories, Robarts Research Institute, London, Ontario, Canada and Biomedical E ...;Imaging Research Laboratories, Robarts Research Institute, London, Ontario, Canada;Department of Medical Biophysics, The University of Western Ontario, London, Ontario, Canada and Imaging Research Laboratories, Robarts Research Institute, London, Ontario, Canada and Biomedical E ...
Venue:
Computer Methods and Programs in Biomedicine
Year:
2006

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Abstract

Boundary outlining, or segmentation, of the prostate is an important task in diagnosis and treatment planning for prostate cancer. This paper describes an algorithm based on two-dimensional (2D) active shape models (ASM) for semi-automatic segmentation of the prostate boundary from ultrasound images. Optimisation of the 2D ASM for prostatic ultrasound was done first by examining ASM construction and image search parameters. Extension of the algorithm to three-dimensional (3D) segmentation was then done using rotational-based slicing. Evaluation of the 3D segmentation algorithm used distance- and volume-based error metrics to compare algorithm generated boundary outlines to gold standard (manually generated) boundary outlines. Minimum description length landmark placement for ASM construction, and specific values for constraints and image search were found to be optimal. Evaluation of the algorithm versus gold standard boundaries found an average mean absolute distance of 1.09+/-0.49mm, an average percent absolute volume difference of 3.28+/-3.16%, and a 5x speed increase versus manual segmentation.