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  • 1
    Electronic Resource
    Electronic Resource
    Multivariate analysis of the adjustment of the colour Duplex unit for the differential diagnosis of lymph node alterations (1999)
    Springer
    European radiology 9 (1999), S. 1445-1450 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Ultrasonography ; Colour Doppler ; Lymphatic system ; Neoplasms ; Lymph nodes ; Blood supply
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Intranodal angioarchitecture was used as criterion for the differential diagnosis of lymph node alterations by colour duplex sonography. The influence of the adjustment of the duplex unit on the diagnostic accuracy and on the rate of lymph nodes with detectable intranodal flow signals was tested. A total of 243 superficial lymph nodes in 127 patients were included in a retrospective study. Diagnoses were approved by histopathology (n = 173) or clinical follow-ups (n = 70 reactive lymph nodes). The intranodal angioarchitecture and sonomorphology were assessed. We used nonparametric discriminant analysis in order to define appropriate settings for transducer frequency, flow mode, power and threshold which result in the best diagnostic quality. Of the lymph nodes, 87 % displayed flow signals using a threshold of ≥ 13 and the flow modes low or medium. Vascularisation was detected only in 47 % of the nodes assessed with different adjustments. Diagnostic accuracy dropped from 94 to 68–84 % if threshold was 〈 13 or power was less than –11 dB. An insufficient adjustment of the colour duplex unit decreases the chance of detecting intranodal flow signals and impairs the diagnostic quality of colour duplex sonography. Flow mode, power and threshold are the most important parameters which have to be adjusted properly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050868
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Current value of double-contrast pharyngography and of computed tomography for the detection and for staging of hypopharyngeal, oropharyngeal and supraglottic tumors (1999)
    Springer
    European radiology 9 (1999), S. 1843-1850 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Pharynx ; Larynx ; Neoplasms ; Radiography ; CT ; Deglutition disorders
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. In light of recent endoscopic techniques the current value of double-contrast pharyngography (DCP) and of CT for detection and staging of hypo-, oropharyngeal, and supraglottic tumors is evaluated. The DCP of 151 patients and CT obtained from 99 of these patients were retrospectively analyzed in a double-blinded manner. We used a standard protocol which comprised all relevant anatomical subregions. Results were compared with direct microlaryngoscopy (DL), indirect laryngoscopy (IL), and post-operative histopathological findings. Sensitivity and specificity of DCP was 75.0 % and 86.7 %, respectively. The DCP and IL techniques together yielded a higher sensitivity (96.7 %) than each method separately. Sensitivity and specificity of CT was 87.5 and 100 %, respectively. In 74.7 % CT provided correct staging. Subregional analysis revealed that the results of DCP and CT depend highly on the localization of the tumor. Our results indicate that DCP represents an important screening method for diagnosing hypo-, oropharyngeal, and supraglottic tumors to complete IL and DL. We show that CT is a reliable method for preoperative staging, although small superficial tumors may occasionally be missed by this method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050933
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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