Shape Analysis for Microscopy Kangyu Pan in collaboration with: Jens Hillebrand, Mani Ramaswami Institute for Neuroscience Trinity College Dublin & Michael J. Higgins
Intelligent Polymer Research Institute University of Wollongong, Australia Memory Formation Jens Hillebrand, Mani Ramaswami Institute for Neuroscience Trinity College Dublin Neuron cells
Stimulated synapses Protein synthesis Roles of the specific proteins Shape of the synapses Roles of the specific proteins ? Co-localization of the different proteins
Gaussian Mixture Model KEY: fitting a GMM to the surface of an object Optimization Parameters of the Gaussian mixture components Number of the components Optimized by Split & Merge Expectation Maximization algorithm (SMEM)
Merge Split directions distance ? ?
Split Algorithm Firstly, similar to Zhangs split technique  relied on multiple random splits at each iteration  Z. Zhang, C. Chen, J. Sun, and K. L. Chan, EM algorithms for Gaussian mixtures with splitand-merge operation, Pattern Recognition, vol. 36, no. 9, pp. 19731983, 2003. Split operation Section(4.2.2) EM operation
Publication: K. Pan, A. Kokaram, J. Hillebrand, and M. Ramaswami, Gaussian mixtures for intensity modelling of spots in microscopy, IEEE International Symposium on Biomedical Imaging (ISBI), 2010. Lately, we developed an error-based SMEM (eSMEM) which is deterministic, repeatable, more efficient. Error distribution A collection of the error that belongs to each mixture component at each pixel site
Estimation error From the E-step of EM E ( x n ) | I EM ( x n ) I norm ( x n ) | Error distribution E m ( xn ) wm ( xn ) E ( xn ) New
Error-based Split algorithm Contour view i Split directions distance
j ? ? x min 2 x min 1 j
i x max X min Results I norm (x )
I EM (x ) Publication: K. Pan, J. Hillebrand, M. Ramaswami, and A. Kokaram, Gaussian mixture models for spots in microscopy using a new split/merge EM algorithm, IEEE International Conference on Image Processing (ICIP'10) , 3645-3648 (2010). GUI for the biologists Co-localization Analysis
Shape of synapses ? Publication: K. Pan, D. Corrigan, J. Hillebrand, M. Ramaswami, and A. Kokaram, A Wavelet-Based Bayesian Framework for 3D Object Segmentation in Microscopy, SPIE BiOS Symposium. Regeneration of muscle tissue Michael J. Higgins Intelligent Polymer Research Institute University of Wollongong, Australia
Research on a novel technique that uses electrical stimulation to control the growth of muscle cells through conductive polymer materials. To assess the performance of various processes, we must measure muscle cell density quantitatively. Which requires the classification of: Cell (with only one nucleus)
& Fibres (with multiple nuclei inside cell body) Skeletal muscle cells & fibres The number of nuclei in each cell/fibre Segmentation of the cell/fibre (especially the overlapped cells and fibres)
Cell body (segmentation of the overlapped cell bodies) Skeletal cells & fibres Nuclei (Using GMM and optimized with eSMEM) Cellsnake :
A NEW ACTIVE CONTOUR TECHNIQUE FOR CELL/FIBRE SEGMENTATION Publication: K. Pan, A. Kokaram , K. Gilmore , M. J. Higgins , R. Kapsa and G. G. Wallace, Cellsnake: A new active contour technique for cell/fibre segmentation, IEEE International Conference on Image Processing (ICIP'11) , 36453648 (2011). Future work Organize the algorithms as plug-in tools for the software that the biologists used (like IGOR Pro). Run more experiments to further examine the performance of the
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