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Träfflista för sökning "WFRF:(Larson G.) srt2:(1995-1999)"

Sökning: WFRF:(Larson G.) > (1995-1999)

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  • Einarsdottir, H, et al. (författare)
  • MR imaging of lipoma and liposarcoma
  • 1999
  • Ingår i: Acta radiologica (Stockholm, Sweden : 1987). - : SAGE Publications. - 0284-1851 .- 1600-0455. ; 40:1, s. 64-68
  • Tidskriftsartikel (refereegranskat)abstract
    • Purpose: To evaluate whether lipoma, atypical lipomatous tumors, and lipo-sarcomas can be differentiated by MR images. Material and Methods: The MR images of 59 lipomatous lesions and liposarcomas were retrospectively reviewed. Apart from size, surgical site, location and margins, the percentage of fat of the tumor volume was assessed as none, 1-75%, 75-95%, or 95-100%. Results: None of the 18 liposarcomas contained fat that could be recognized by MR imaging. The 3 atypical lipomatous tumors all contained fat but less than 75% of the tumor volume. In 32 of 38 ordinary lipomas, the percentage of fat was 95-100%, and in 4 less than 95% of the tumor volume. Two lipomas did not contain fat that could be recognized by MR imaging. Conclusion: A lesion which predominantly has a fat signal is, in all probability, an ordinary lipoma. Lesions with less fat, but still mostly fatty, may either be lipoma or atypical lipomatous tumor. In this group, the discrimination between these two entities cannot be based upon imaging features. In the absence of a fat signal, liposarcoma or lipoma cannot be differentiated from other soft tissue tumors.
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  • Eliasson, T, et al. (författare)
  • Myocardial turnover of endogenous opioids and calcitonin-gene-related peptide in the human heart and the effects of spinal cord stimulation on pacing-induced angina pectoris.
  • 1998
  • Ingår i: Cardiology. - : S. Karger AG. - 0008-6312 .- 1421-9751. ; 89:3, s. 170-7
  • Tidskriftsartikel (refereegranskat)abstract
    • Earlier studies have shown that spinal cord stimulation (SCS) has antianginal and anti-ischemic effects in severe coronary artery disease. In the present study, 14 patients were subjected to right-sided atrial catheterization and atrial pacing. The patients were paced to angina during a control session and during spinal cord stimulation. Myocardial extraction of beta-endorphin (BE) during control pacing (8 +/- 22%) changed to release at the maximum pacing rate during treatment (-21 +/- 47%, a negative value representing release). Furthermore, the results indicate local myocardial turnover of leuenkephalin, BE and calcitonin-gene-related peptide. In addition, it is implied that SCS may induce myocardial release of BE which could explain the beneficial effects in myocardial ischemia.
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  • Larson, Mats G, 1968 (författare)
  • Analysis of Adaptive Finite Element Methods
  • 1996
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis is concerned with the analysis and design of adaptive finite element methods for a variety of differential equations in mechanics and physics, including linear and semilinear elliptic equations, eigenvalue problems, the stationary Navier-Stokes equations, and Hamiltonian systems. The analysis focuses on sharp a posteriori error estimates, sharp a priori error estimates, stability properties, and the design of adaptive algorithms. The performance of the adaptive methods is illustrated by numerical examples.
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