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Sökning: WFRF:(Wåhlin Anders) > Konferensbidrag

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  • Dunås, Tora, et al. (författare)
  • Towards Automatic Identification of Cerebral Arteries in 4D Flow MRI
  • 2015
  • Ingår i: 16th Nordic-Baltic Conference on Biomedical Engineering. - Cham : Springer International Publishing. - 9783319129662 - 9783319129679 ; , s. 40-43
  • Konferensbidrag (refereegranskat)abstract
    • 4D flow MRI is a powerful imaging technique which provides an angiographic image with information about blood flow in a large volume, time resolved over the cardiac cycle, in a short imaging time. This study aims to develop an automatic method for identification of cerebral arteries. The proposed method is based on an atlas of twelve arteries, developed from 4D flow MRI of 25 subjects. The atlas was constructed by normalizing all images to MNI-space, manually identifying the arteries and creating an average over the volume. The identification is done by extracting a vascular skeleton from the image, transforming it to MNI-space, labeling it with the atlas and transforming it back to subject space. The method was evaluated on a pilot cohort of 8 subjects. The rate of correctly identified arteries was 97%.
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  • Jansson, E, et al. (författare)
  • On the acoustical function of the violin
  • 1997
  • Ingår i: 25. Congresso nazionale : Perugia, 21-23 maggio 1997 : atti / Associazione italiana di acustica.
  • Konferensbidrag (refereegranskat)
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  • Mattsson, Roger, et al. (författare)
  • Laser ignition of premixed gases studied by pulsed TV holography
  • 2003
  • Ingår i: Speckle metrology 2003. - Bellingham, Wash : SPIE - International Society for Optical Engineering. - 0819447285 ; , s. 285-290
  • Konferensbidrag (refereegranskat)abstract
    • Pulsed TV holography is an all-electronic version of pulsed holographic interferometry. Such a system was used to study ignition of pre-mixed flammable gases. The object was recorded in its undisturbed and disturbed state followed by an evaluation of the changes in refractive index field between those two states. The essential components of the set-up are an injection seeded, twin cavity double pulsed Nd:YAG laser and a CCD camera. A focused laser pulse from the same laser that was used for the recording of the digital hologram initiated the ignition of the pre-mixed gas. Results from the recordings show the ignition process. From the experimental phase maps the refractive index of the gas mixture could be determined. This method makes it possible to determine the proportion of components in a pre-mixed flammable gas in situ
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