N. D. Smith

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The effects of numerical model error on 4D-Variational data assimilation (4D-Var) are investigated. 4D-Var is a method used to create an initialisation for a numerical model, that best replicates subsequent observations of the system it models. The numerical error introduced by this model is considered in the form of numerical dissipation and dispersion. We(More)
Cone beam computed tomography (CBCT) enables a volumetric image reconstruction from a set of 2D projection data. It plays an important role in image guided radiation therapy (IGRT). However, it is desirable to lower the patient radiation dose while maintaining good quality tomographic reconstructions. Hence, methods are needed even when the data is(More)
Cone Beam Computed Tomography (CBCT) is widely used in radiation therapy for verifying treatment areas, since it provides three-dimensional image reconstruction of those tumour regions under inspection. However, organ motion is problematic during the scanning process, it causes motion artefacts on the CBCT image and can lead to mispositioning for the(More)
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