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Träfflista för sökning "(WFRF:(Gustavsson Tomas 1954)) srt2:(1995-1999)"

Sökning: (WFRF:(Gustavsson Tomas 1954)) > (1995-1999)

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  • Gustavsson, Tomas, 1954 (författare)
  • Den medicinska bilden
  • 1995
  • Ingår i: Medicinsk Informatik, editor Peterson, Rydmark.
  • Bokkapitel (övrigt vetenskapligt/konstnärligt)
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  • Gustavsson, Tomas, 1954, et al. (författare)
  • Implementation and Comparison of Four Different Boundary Detection Algorithms for Quantitative Ultrasonic Measurements of the Human Carotid Artery
  • 1997
  • Ingår i: IEEE Conf. on Computers in Cardiology, Lund, Sweden, 7-10 Sep. ; 24, s. 69-72
  • Konferensbidrag (refereegranskat)abstract
    • In this paper we examine four algorithms for automated ultrasonic boundary detection, and describe the application of these algorithms to the quantification of the intima-media thickness (IMT) in the human carotid artery. The first algorithm uses a dynamic programming approach to identify the boundary that minimizes a certain cost function. The second algorithm is based on finding points of maximum gradient The third algorithm employs a mathematical model describing the intensity profile perpendicular to the two boundaries defining the IMT. The last algorithm is based on defining a template representing the intensity profile across a boundary and applying a matched filter procedure to find the image region that best marches it. We also present a quantitative and qualitative comparison between the four algorithms examined. It is shown that the dynamic programming algorithm provides superior performance in terms of accuracy and robustness. The correlation coefficients between automated measurements and manually obtained reference values were 0.96, 0.94, 0.63, and 0.85 for the dynamic programming, the maximum gradient, the model-based, and the matched filter algorithm, respectively (n=30).
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  • Hamarneh, Ghassan, 1972, et al. (författare)
  • A Method for Modeling and Segmentation of Spatio-Temporal Shapes
  • 1999
  • Ingår i: Proceedings of the Swedish Symposium on Image Analysis (SSAB). Göteborg, Sweden.
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents a method for modeling and segmenting spatio-temporal shapes. The modeling part is based on obtaining a description of the statistical variations of spatio-temporal shape parameters by studying a representative training set of examples. A deformable modelof spatio-temporal shapes is used for segmenting similarshapes in new image sequences. The deformations of the model are driven by image features and are forced toproduce results that are similar to what was found in thetraining set. The proposed deformations of the spatio-temporal shape are chosen to minimize a cost function usinga dynamic programming approach. The preliminary resultspresented show that the method succeeds in segmentingcomplex spatio-temporal shapes in synthetic noisy data.
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