Dr Leigh Johnston
BSc BE (Hons) PhD
Research Associate
Neuroimaging Group
Senior Research Fellow
Department of Electrical and Electronic Engineering (Uni Melb)
Contact Details
Email: | |
Phone: | +61 (0)3 8344 1940 |
Research Interests
- Signal and image processing techniques for Magnetic Resonance Imaging acquisition, reconstruction and analysis
- Modelling brain development.
Publications and Articles
Journal Publications
- L.A. Johnston*, J.M. Britto* and S-S. Tan, The stochastic search dynamics of interneuron migration, to appear, The Biophysical Journal (accepted 28/04/09) (*joint first authors).
- B. Tahayori, L.A. Johnston, P. Farrell and I. Mareels, Revisiting the excitation pattern design for magnetic resonance imaging through optimisation of the signal contrast efficiency, to appear, Journal of Biomedical Signal Processing and Control (accepted 31/03/09).
- T. Close, J.D. Tournier, F. Calamante, L.A. Johnston, I. Mareels, A. Connelly, A software tool to generate simulated white matter structures for the assessment of fibre-tracking algorithms, to appear, NeuroImage (accepted 28/03/09).
- A. Sritharan, G.F. Egan, L.A. Johnston, M. Horne, J.L. Bradshaw, I. Bohanna, H. Asadi, R. Cunnington, A.J. Churchyard, P. Chua, M. Farrow, N. Georgiou-Karistianis, A longitudinal diffusion tensor imaging study in symptomatic Huntington’s disease, to appear, Journal of Neurology, Neurosurgery & Psychiatry (accepted 14/01/09).
- G. Geng, L.A. Johnston, E. Yan, J.M. Britto, D.W.Smith, D.W. Walker and G.F. Egan, Biomechanisms for modelling cerebral cortical folding, to appear, Medical Image Analysis (accepted 03/10/08).
- S.C. Kolbe, C.A. Chapman, T. Nguyen, C.E. Bajraszewski, L.A. Johnston, M. Kean, P. Mitchell, H. Butzkueven, M. Paine, T.J. Kilpatrick, G.E. Egan, Optic nerve diffusion changes and atrophy jointly predict visual dysfunction after optic neuritis, NeuroImage, vol. 45, pp.679-686, 2009.
- E. Duff, L.A. Johnston, J. Xiong, P. Fox, I. Mareels and G. Egan, "The power of spectral densities in mapping endogenous BOLD signal fluctuations", Human Brain Mapping, vol. 29(7), pp.778-790, July 2008.
- L.A. Johnston, E. Duff, I. Mareels and G. Egan, Nonlinear estimation of the BOLD signal, NeuroImage, vol.40(2), pp.504-514, April 2008.
- L.A. Johnston and V. Krishnamurthy, Opportunistic File Transfer over a Fading Channel - A POMDP Search Theory Formulation with Optimal Threshold Policies, IEEE Transactions on Wireless Communications, vol.5(2), pp.394-405, February 2006.
- J.H. Elder, A. Krupnik and L.A. Johnston, Contour grouping with prior models, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.25(6), pp.661-674, June 2003.
- L.A. Johnston and V. Krishnamurthy, Performance analysis of a dynamic programming track before detect algorithm, IEEE Transactions on Aerospace and Electronic Systems, vol.38(1), pp.228-242, January 2002.
- L.A. Johnston and V. Krishnamurthy, An improvement to the interacting multiple model (IMM) algorithm, IEEE Transactions on Signal Processing, vol.49(12), pp.2909-2923, December 2001.
- L.A. Johnston and V. Krishnamurthy, Derivation of a sawtooth iterated extended Kalman smoother via the AECM algorithm, IEEE Transactions on Signal Processing, vol.49(9), pp.1899-1909, September 2001.
- L. Johnston and V. Krishnamurthy, Hidden Markov model algorithms for narrowband interference suppression in CDMA spread spectrum systems, Signal Processing, vol.79(3), pp.315-324, December 1999.
- L.A. Johnston and V. Krishnamurthy, Finite dimensional smoothers for MAP state estimation of bilinear systems, IEEE Transactions on Signal Processing, vol.47(9), pp.2444-2459, September 1999.
Refereed Conference Publications
- B. Tahayori, L.A. Johnston, I. Mareels and P. Farrell, "Novel insight in Magnetic Resonance through a spherical coordinate framework for the Bloch equation", in SPIE Medical Imaging, Orlando Florida, pp.7258-7233, February 2009.
- Z. Chen, L. Johnston, N. Faggian and G. Egan, A multistage parallel magnetic resonance image reconstrution method, in Proc. DICTA '08.Digital Image Computing: Techniques and Applications, Canberra, pp.327-334, December 2008.
- N. Faggian, Z. Chen, L. Johnston, O.S. Hong, Z.H. Cho and G. Egan, A method for shape analysis and segmentation in MRI, in Proc. DICTA '08.Digital Image Computing: Techniques and Applications, Canberra, pp.335-342, December 2008.
- B. Tahayori, L.A. Johnston, I. Mareels and P. Farrell, A new approach for solving the Bloch equation, in Proc. IEEE Conference on Decision and Control 2008, Cancun Mexico, pp.4121-4126, December 2008.
- L.A. Johnston, S. Kolbe, I. Mareels and G.F. Egan, Voxelwise regularisation of high angular resolution diffusion imaging data, in Proc. IEEE Conference on Engineering in Medicine and Biology, pp.90-93, August 2008.
- B. Tahayori, L.A. Johnston, I. Mareels and P. Farrell, Magnetic resonance described in the excitation dependent rotating frame of reference, in Proc. IEEE Conference on Engineering in Medicine and Biology, pp.5769-5773, August 2008.
- B. Tahayori, L.A. Johnston, I. Mareels and P. Farrell, Challenging the optimality of the pulse excitation in Magnetic Resonance Imaging, in Proc. IFAC World Congress, Seoul Korea, pp.10301-10306, July 2008.
- G. Geng, L.A. Johnston, E. Yan, D. Walker and G. Egan, Modelling cerebral cortical folding, Workshop on Computational Biomechanics for Medicine II, pp.55-64, October 2007.
- L.A. Johnston, E. Duff and G. Egan, Particle filtering for nonlinear BOLD signal analysis, in Proc. 9th International Conference on Medical Image Computing and Computer Assisted Intervention, Copenhagen, pp.308-315, October 2006.
- C. Adamson, L.A. Johnston, T. Inder, S. Rees, I. Mareels and G. Egan, A tracking approach to parcellation of the cerebral cortex, in Proc.8th International Conference on Medical Image Computing and Computer Assisted Intervention, Palm Springs, pp.294-301, October 2005.
- L.A. Johnston and J.H. Elder, Efficient computation of closed contours using modified Baum-Welch updating, in Conference on Computer Vision and Pattern Recognition Workshop, Washington, D.C., pp.48.1-48.9, June 2004.
- L.A. Johnston and V. Krishnamurthy, Optimality of threshold transmission policies in Gilbert Elliott fading channels, IEEE International Conference on Communications, Anchorage, Alaska, pp. 1233-1237, May 2003.
- L.A. Johnston, V. Krishnamurthy and L. Davis, On the formation of extrinsic information in Turbo decoding, 2001 IEEE International Symposium on Information Theory, Washington D.C., p.192, June 2001.
- L.A. Johnston and V. Krishnamurthy, Performance analysis of a track before detect dynamic programming algorithm, ICASSP'2000, Istanbul, Turkey, pp.49-52, June 2000.
- L.A. Johnston and V. Krishnamurthy, On the equivalence of the extended Kalman smoother and the Expectation Maximisation algorithm, in Proc. IFAC World Congress, Beijing China, vol. H, pp. 145-150, July 1999.
- L.A. Johnston, C. Carlemalm and A. Logothetis, A modal approach to time delay estimation in asynchronous CDMA systems, in Proc. Canadian Workshop on Information Theory, Kingston, Canada, pp.91-94, June 1999.
- L.A. Johnston and V. Krishnamurthy, Mode--matched filtering via the EM algorithm, in Proc. American Control Conference, San Diego, pp.1930-1934, June 1999.
- L.A. Johnston and V. Krishnamurthy, On the equivalence of the extended Kalman smoother and the Expectation Maximisation algorithm for polynomial signal models, in Conference on Information, Decision and Control, Adelaide, Australia, pp.303-308, February 1999.
- L.A. Johnston and V. Krishnamurthy, Finite dimensional hybrid smoothers, in Proc. 37th IEEE Conference on Decision and Control, Tampa, Florida, pp.3942-3947, December 1998.
- L.A. Johnston and V. Krishnamurthy and A. Logothetis, Iterative algorithms for optimal MAP estimation of bilinear systems, in Proc. IEEE International Symposium on Information Theory, MIT, Massachusetts, p.23, August 1998.
- L.A. Johnston and V. Krishnamurthy, A recursive prediction error algorithm for narrowband interference suppression in spread spectrum systems, in Proc. IEEE International Conference on Communications, Atlanta, USA, pp.733-737, June 1998.
- V. Krishnamurthy, L.A. Johnston and A. Logothetis, Optimal MAP estimation of bilinear systems via the EM algorithm, in Proc. IEEE Conference on Acoustics, Speech and Signal Processing, pp.2373-2376, Seattle, USA, May 1998.
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