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  • 1
    Electronic Resource
    Electronic Resource
    Diagnosis of pulmonary metastases with turbo-SE MR imaging (1997)
    Springer
    European radiology 7 (1997), S. 1190-1194 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Pulmonary metastases ; Computed tomography ; MR imaging ; Turbo spin echo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The sensitivity of MR imaging for detection of pulmonary metastases was evaluated in 23 patients. The MR imaging was performed with T2-weighted turbo-spin-echo (TSE) sequences at 1.5 T. The MR images were compared with spiral volumetric CT which served as the radiological standard. All MR images were interpreted by two radiologists without knowledge of CT findings. The MR imaging technique initially enabled correct identification of altogether 286 of 340 metastases (84 %) resulting in sensitivities of 36 % (size of nodules 〈 5 mm), 83 % (size of nodules 5–10 mm), 92 % (size of nodules 10–15 mm), and 100 % (size of nodules 〉 15 mm). Retrospectively with knowledge of CT findings an additional 39 metastases were visible; 15 remained undetected even retrospectly. The results of this paper suggest that MRI still does not have a role for screening for pulmonary metastases. It proves, however, that the incidental diagnosis of a pulmonary lesion on T2-weighted TSE images is highly reliable in representing a pulmonary nodule also visible on CT. However, thus far the malignant nature especially of small nodules detected by MRI (as by CT) remains uncertain even in patients with known malignant neoplasm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050272
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  • 2
    Electronic Resource
    Electronic Resource
    Long-term evaluation of titania-based ceramics compared with commercially pure titanium in vivo (1995)
    Springer
    Journal of materials science 6 (1995), S. 451-454 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Fifty-four cylinders (2.8 mm in diameter) machined from hot isostatically pressed titania (TI) and titania-hydroxyapatite (TI/HA-15 vol%) sintered at 925°C, as well as commercially pure titanium (c.p. Ti), were implanted in the fermoral cortical bone of New Zealand white rabbits for 1, 3 and 12 months. The shear strength between bone and implant was measured by a push-out test. The TI/HA composite showed a significantly higher bonding strength to bone compared to c.p. Ti at all times, while no differences were observed between TI and c. p. Ti at 1 and 3 months after implantation. Titania-based materials had a significantly higher bonding strength than that of c.p. Ti one year after implantation. The results indicate that bioactivity of HA in TI/HA composite contributes to the early bone apposition reflected by high bonding strength, while the stability of the oxide, determines the development of long-term bonding strength. Both effects may be explained by the level and type of ions released from the ceramic implant. HA has a positive conduction to bone ingrowth while TI has a limited interaction to the bone apposition due to the extraordinary low ion release in vivo. Under light microscopy, similar patterns of bone-implant interfaces were seen from titania-based materials and c.p. Ti in 3-month samples, indicating high biocompatibility of these materials. However, histological evaluation by light microscope cannot identify the differences between physical contact and chemical bonding of implant-bone interface, and thus does not give information on bonding mechanism and the level of shear stresses developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00123369
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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