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)
We propose a platform to achieve ultra-high Quality factor (Q) optical resonators based on semiconductor nanowires. By defining one-dimensional photonic crystal at nanowire ends and engineering the micro-cavity pattern, cavities with Q of 3×10 5 and mode volume smaller than 0.2(λ/n) 3 have been designed. This represents an increase of almost three orders of(More)
In this talk I will discuss our work on MOCVD growth of III-V nanowires (NWs) directly on a silicon substrate. The small dimensions of NWs relax the lattice matching requirements imposed by planar epitaxial growth, as the strain is relaxed through defect generation directly at the interface. This allows us, to investigate highly mismatched heterosystems,(More)
Estimating the transverse relaxation time (T 2) from magnitude spin echo images is a common problem in Magnetic Resonance Imaging. The standard approach is to use pixel-wise 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 formulation of(More)
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