Marilena Petrou

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Texture analysis of positron emission tomography (PET) images of the brain is a very difficult task, due to the poor signal to noise ratio. As a consequence, very few techniques can be implemented successfully. We use a new global analysis technique known as the Trace transform triple features. This technique can be applied directly to the raw sinograms to(More)
Image resolution of the multihole collimator gamma rays camera is always an issue. In this paper, we present a comparative study of various methods proposed to increase the resolution of images captured by a gamma camera using the Wiener filtering. A simulated multihole collimator gamma camera was used, modelled by the Monte Carlo N-Particles Code version(More)
Personal inquiry learning trajectories in geography: technological support across contexts Lucinda Kerawalla, Karen Littleton, Eileen Scanlon, Ann Jones, Mark Gaved, Trevor Collins, Paul Mulholland, Canan Blake, Gill Clough, Gráinne Conole & Marilena Petrou a Faculty of Education and Language Studies, Open University, Walton Hall, Milton Keynes, MK7 6AA, UK(More)
Supporting learning across different contexts can be challenging. Defining formal, informal and nonformal learning is the subject of continuing debate as each can be difficult to describe. We report on a study that evaluated the effectiveness of a Personal Inquiry toolkit on supporting personal inquiries into the sustainability of the food cycle, carried(More)
Interactions between students can be ineffective when they fail to understand how to talk together and what they should aim to achieve (Dawes, Mercer & Wegerif, 2004). Research suggests that argumentation skills need to be taught explicitly to children and recent work developed students’ collaborative argumentation as a means of improving their(More)
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