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Träfflista för sökning "WFRF:(Lagerstrand Kerstin M) srt2:(2005-2009)"

Sökning: WFRF:(Lagerstrand Kerstin M) > (2005-2009)

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1.
  • Lagerstrand, Kerstin M, et al. (författare)
  • Flow-induced disturbances in balanced steady-state free precession images: means to reduce or exploit them.
  • 2009
  • Ingår i: Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine. - : Wiley. - 1522-2594. ; 61:4, s. 893-8
  • Tidskriftsartikel (refereegranskat)abstract
    • In this work computer simulations and phantom measurements are presented that show the effect of flow on in-plane balanced steady-state free precession images. The images were studied for various flow velocities, excitation regions, relaxation times, RF-pulse angles, and off-resonance frequencies. The work shows that flow-induced disturbances are present in the images, but can be reduced by the application of inhomogeneous excitation regions. Also, a velocity quantification method that utilizes the disturbances was developed and proved to quantify flow velocities accurately. The work concluded that the flow-induced disturbances can be reduced to improve image quality, but can also be exploited to quantify the flow velocity.
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3.
  • Lagerstrand, Kerstin M, et al. (författare)
  • Quantitative phase-contrast flow MRI measurements in the presence of a second vessel closely positioned to the examined vessel.
  • 2006
  • Ingår i: Journal of magnetic resonance imaging : JMRI. - : Wiley. - 1053-1807 .- 1522-2586. ; 23:2, s. 156-62
  • Tidskriftsartikel (refereegranskat)abstract
    • PURPOSE: To examine the influence of the truncated sampling of k-space data on the accuracy of phase-contrast (PC) flow quantifications in the presence of nearby vessels. MATERIALS AND METHODS: Computer simulations were performed along with some experimental validations on a flow phantom and a normal subject. RESULTS: The accuracy of the PC flow quantification decreased when a second vessel was positioned closely to the examined vessel. The effect strongly depended on the peak flow velocity in the second vessel relative to the velocity encoding (venc) level of the MRI acquisition, and on the position and area of the second vessel. CONCLUSION: Due to the truncated sampling of the k-space data, signal leaked from nearby vessels and distorted the PC flow quantification in the examined vessel. The presented results suggest specific experimental conditions to minimize this flow quantification error.
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