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  • 1
    Electronic Resource
    Electronic Resource
    Contribution of color and power Doppler sonography to the differential diagnosis of acute and chronic rejection, and tacrolimus nephrotoxicity in renal allografts (1999)
    Springer
    Transplant international 12 (1999), S. 127-134 
    Details
    ISSN: 1432-2277
    Keywords: Key words Doppler sonography ; Acute rejection ; Chronic rejection ; Tacrolimus ; Kidney transplantation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The aim of the present study was to differentiate acute rejection, chronic rejection, and tacrolimus nephrotoxicity with color and power Doppler imaging of renal transplants. One hundred examinations were obtained from 45 patients. Pulsatility and resistive indices were calculated from color Doppler images. The grade of renal vascularization was quantified using computer-assisted pixel analysis in a rectangular region-of-interest. The percentage of vessel-covered renal parenchyma (POV) was calculated using a histogram that discriminated renal vessels from renal parenchyma via power Doppler images. Furthermore, the distance from the most peripherally located vessels to the renal capsule (PVD) was measured. A reduced POV K 55 % proved to be the best discriminator when chronic rejection was suspected (sensitivity 79 %, specificity 87 %). Tacrolimus nephrotoxicity showed not only a moderate elevation of the Doppler signal but also an increased PVD L 3.9 mm and a normal POV. We conclude that the evaluation of renal vessels by power Doppler images improves diagnostic accuracy for patients with renal allografts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001470050197
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cardiac activation mapping by MRI (1996)
    Springer
    Magnetic resonance materials in physics, biology and medicine 4 (1996), S. 19-25 
    Details
    ISSN: 1352-8661
    Keywords: magnetic resonance imaging ; cardiac activation sequence ; Fourier phase analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics
    Notes: Abstract To establish cardiac MRI as a tool for noninvasive evaluation of activation patterns, 10 healthy volunteers were examined by cine segmented turboFLASH imaging sequences. Sequence modifications for low signal blood-pool appearance were applied, i.e., bilateral spatial saturation for segmented turboFLASH imaging. Pixelwise calculation of first-harmonic Fourier phase values (displayed as color-encoded maps) reveal either anterior septal or left ventricular free-wall sites as areas of earliest phase spreading towards posterior paraseptal sites in segmented turboFLASH scans. Phase scatter is lower in unsaturated than spatially presaturated segmented turboFLASH studies. Phase standard deviation in areas of endocardial displacement is higher in basal than apical slice positions in these scans. Early results indicate that first-harmonic Fourier phase analysis of cardiac-segmented turboFLASH MRI cine studies may provide a tool for noninvasive studies of cardiac activation sequence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01759776
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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