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  • 1
    Electronic Resource
    Electronic Resource
    A new ultrasound-based method for the assessment of torsional differences following closed intramedullary nailing of femoral fractures (1999)
    Springer
    Skeletal radiology 28 (1999), S. 336-341 
    Details
    ISSN: 1432-2161
    Keywords: Key words Femoral torsion ; Torsional difference ; Ultrasound ; Femoral fractures ; Anterior condylar line
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. A torsional difference of more than 15° is found in up to 30% of patients following closed intramedullary nailing of femoral fractures. The diagnosis is usually established postoperatively by computed tomography. A torsional deformity of more than 15° should be corrected by early derotation. In order to enable an intraoperative control and possible correction to avoid a second operation for the patient, a new ultrasound-based method suitable for the intraoperative setting has been developed, using the anterior condylar line as a distal reference line. Design and patients. In a prospective study the torsional difference after closed intramedullary nailing of femoral fractures was measured postoperatively by ultrasound in 32 patients and compared with standard CT readings. Results. Torsional differences measured by ultrasound and CT showed a high correlation (r=0.8) and a median difference of less than ±3°. Conclusions. By the introduction of the anterior condylar line as a distal reference line femoral torsion can accurately be assessed by ultrasound in a position required for intraoperative control and possible correction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002560050527
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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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