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ISMRM Fellowships 2017

Congratulations to Danny Alexander and Andrada Ianus on receiving prestigeous ISMRM fellowships. More...

Published: Apr 26, 2017 11:05:24 AM

Prostate work of Yipeng Hu et al on the cover of IEEE Transactions on Biomedical Engineering - April 2017

Congratulations to Yipeng Hu, Dean Barratt et al for their work on prostate biopsies which is on the cover of IEEE Transactions on Biomedical Engineering.

Published: Apr 10, 2017 1:55:35 PM

Echoes Around the Home.

Echoes Around The Home is a cross disciplinary project conceived and led by Dr Nicholas Firth (UCL Computer Science), working with social scientists Prof. Mary Pat Sullivan (Nipissing University Applied and Professional Studies) and Emma Harding (UCL Institute of Neurology), neuropsychologist Prof. Sebastian Crutch (UCL Institute of Neurology) and computer scientist Prof. Daniel Alexander (UCL Computer Science). This project has been funded by a Social Science Plus+ award from The Collaborative Social Science Domain UCL and will begin installing Echo’s in late March. More...

Published: Feb 6, 2017 3:51:52 PM

Andreas Hauptmann - Lebina Kakkar

Start: May 24, 2017 01:00 PM
End: May 24, 2017 02:00 PM

Location: UCL Bloomsbury - Roberts 106 Roberts Building

Lebina Shrestha Kakkar

Title: Comparison of OGSE and SDE ActiveAx for axon diameter mapping: An experimental study in viable nerve tissue


Mapping axon diameters within the central and peripheral nervous system could play an important role in our understanding of nerve pathways, and help diagnose and monitor an array of neurological disorders. Numerous diffusion MRI methods have been proposed for imaging axon diameters, most of which use conventional single diffusion encoding (SDE) spin echo sequences. However, a growing number of studies show that oscillating gradient spin echo (OGSE) sequences can provide additional advantages over conventional SDE sequences. Recent theoretical results suggest that this is especially the case in realistic scenarios, such as when fibres have unknown or dispersed orientation. In the seminar I will present some recent work that experimentally investigates the extent of these advantages by comparing the performances of OGSE and SDE in viable nerve tissue. The results will show for the first time in, quantitatively and in an as close as possible to in vivo conditions, that OGSE provides advantages over SDE for axon diameter mapping.

Andreas Hauptmann

Title: A Variational Reconstruction Method for Dynamical X-ray Tomography based on Physical Motion Models


We study the reconstruction of moving object densities from undersampled dynamic X-ray tomography in two dimensions. A particular motivation of this study is to use realistic measurement protocols for practical applications, i.e. we do not assume to have full measurements in each time step, but only projections in few angular directions. This restriction enforces a space-time reconstruction, which we perform by incorporating physical motion models and regularization of motion vectors in a variational framework. The methodology of optical flow, which is one of the most common methods to estimate motion between two images, is utilized to formulate a joint variational model for reconstruction and motion estimation. Results are presented for simulated and real measurement data.

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