Marcus Bjork

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In magnetic resonance imaging (MRI), the balanced steady-state free precession (bSSFP) pulse sequence has shown to be of great interest, due to its relatively high signal-to-noise ratio in a short scan time. However, images acquired with this pulse sequence suffer from banding artifacts due to off-resonance effects. These artifacts typically appear as black(More)
Björk, M. 2015. Contributions to Signal Processing for MRI. Uppsala Dissertations from the Faculty of Science and Technology 113. xviii+176 pp. Uppsala: Acta Universitatis Upsaliensis. ISBN 978-91-554-9204-5. Magnetic Resonance Imaging (MRI) is an important diagnostic tool for imaging soft tissue without the use of ionizing radiation. Moreover, through(More)
Magnetic Resonance Imaging of tissues with both fat and water resonances allows for absolute temperature mapping through parametric modeling. The fat resonance is used as a reference to determine the absolute water resonance frequency which is linearly related to the temperature. The goal of this paper is to assess whether or not resonance frequency based(More)
In this paper we present an algorithm for sequence design with magnitude constraints. We formulate the design problem in a general setting, but also illustrate its relevance to parallel excitation MRI. The formulated non-convex design optimization criterion is minimized locally by means of a cyclic algorithm, consisting of two simple algebraic sub-steps.(More)
Estimating the transverse relaxation time (T<sub>2</sub>) from magnitude spin echo images is a common problem in Magnetic Resonance Imaging. The standard approach is to use pixelwise estimates; however these estimates can be quite noisy when only two images are available. By imposing inter-pixel information the estimates can be improved. An optimal(More)
This article presents a way of modeling patient response to a pharmacotherapy by means of dynamic models with quantized output. The proposed modeling technique is exemplified by treatment of Parkinson's disease with Duodopa <sup>&#x00AE;</sup>, where the drug is continuously administered via duodenal infusion. Titration of Duodopa <sup>&#x00AE;</sup> is(More)
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