Motion correction of head movements in PET: realisation for routine usage
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With the increase of scanner resolution head motion in PET brain studies becomes an increasingly serious limitation. Methods to correct for motion have been proposed. In this work the realisation of a motion tracking system in a PET environment and the motion correction of list mode data with the MAF method is presented. In a phantom study the method is validated and the loss in image quality is documented in a phantom with simulated movements. The relevance of motion correction for patient data above the level of system resolution is studied. In a real patient study we show the effect of motion and the applicability of the presented system.Keywords:
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Abstract The term “self-realisation” is not defined in any Dutch legal provision, but has emerged from case law based on the Expropriation Act. This article describes the development of the right of self-realisation in the Netherlands. In addressing this subject, the article presents a brief historical overview of the Dutch land policy and land policy instruments. In addition, Royal Decrees and case law about the right of self-realisation are discussed.
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An algorithm is presented for minimal state-space realisation of recursive and nonrecursive three-dimensional systems. This algorithm reduces the problem of minimal realisation to that of solving a linear system of matrix equations. Necessary and sufficient conditions for minimal realisation are established and analytical expressions for the state-space system matrices are derived.
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Abstract Multiple realisation prompts the question: how is it that multiple systems all exhibit the same phenomena despite their different underlying properties? In this paper I develop a framework for addressing that question and argue that multiple realisation can be reductively explained. I illustrate this position by applying the framework to a simple example – the multiple realisation of electrical conductivity. I defend my account by addressing potential objections: contra (e.g.) Polger and Shapiro (2016), Batterman (2018), and Sober (1999), I claim that multiple realisation is commonplace, that it can be reductively explained, but that it requires a sui generis reductive explanatory strategy.
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