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  • 1
    Electronic Resource
    Electronic Resource
    CT-gesteuerte Schneid-Saug-Biopsie zur minimal invasiven histologischen Abklärung pathologischer Thoraxbefunde (1999)
    Springer
    Zeitschrift für Herz-, Thorax- und Gefässchirurgie 13 (1999), S. 133-138 
    Details
    ISSN: 0930-9225
    Keywords: Schlüsselwörter Computertomographie – Thorax – Interventionen – Schneid-Saug-Biopsie ; Key words Computer tomography – thorax interventions – carve-suction biopsy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Problem: An investigation into CT-controlled carve-suction biopsy for a histological clarification of indefinite intrathoracic masses. Materials and Method: 143 CT-controlled interventions were performed on 102 patients. For histological evaluation purposes, tissue was taken under application of the carva-suction biopsy method (16–18 gage). The lesions with a diameter of 5–70 mm were located in the mediastinum (25%), were close to the thoracic wall/pleural (40%) and intrapulmonary (35%). Results: 92.2% (94/102) of the interventions provided histologically utilizable material in at least one biopsy specimen. The clinical suspected diagnosis was confirmed 78 times (76.5%), while a different discase was evident 16 times (15.7%). In 8 cases, a diagnosis was not possible (7.8%). The total complication rate was 21.6%. The following were observed: 18 pneumothoraxes, 2 hemothoraxes, and 2 patients who demonstrated a hemoptysis. In 4/102 patients (3.9%) complications arose which had to be treated therapeutically. Two-sided complications were not observed. Conclusions: The CT-controlled carve-suction biopsy can be employed histologically to clarify indefinite intrathoracic findings with a high degree of certainty and justifiable complication rates. In addition to this, the minimally invasive procedure helps to reduce costs.
    Notes: Zusammenfassung Fragestellung: Bewertet wird die CT-gesteuerte Schneid-Saug-Biopsie zur histologischen Abklärung unklarer intrathorakaler Raumforderungen. Material und Methode: Bei 102 Patienten wurden 143 CT-gesteuerte Interventionen durchgeführt. Zur histologischen Beurteilung wurde Gewebe in Schneid-Saug-Biopsie-Technik (16–18 Gage) entnommen. Die Läsionen waren 5–70 mm groß, 25% lagen mediastinal, 40% thoraxwandnah/pleural und 35% intrapulmonal. Ergebnisse: 92,2% (94/102) der Interventionen erbrachten in mindestens einer entnommenen Gewebeprobe histologisch verwertbares Material. Die klinische Verdachtsdiagnose wurde 78mal (76,5%) bestätigt, 16mal (15,7%) wurde eine andere Erkrankung nachgewiesen. 8mal ließ sich keine Diagnose stellen (7,8%). Die Komplikationsrate betrug 21,6% (18 Pneumothoraces, 2 Hämatothoraces und 2 Patienten mit Hämoptoe). Bei 4/102 Patienten (3,9%) traten therapiebedürftige Komplikationen auf. Schlußfolgerungen: Mit der CT-gesteuerten Schneid-Saug-Biopsie lassen sich unklare intrathorakale Befunde mit hoher Treffsicherheit und vertretbaren Komplikationen abklären.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003980050070
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  • 2
    Electronic Resource
    Electronic Resource
    The influence of tube voltage, X-ray exposure rate and thickness of filter material on image quality with dual-energy subtraction imaging in chest diagnostics (1992)
    Springer
    European radiology 2 (1992), S. 258-263 
    Details
    ISSN: 1432-1084
    Keywords: One-shot dual-energy subtraction imaging ; Laser-stimulated luminescence imaging plates ; Energy separation ; Computed radiography ; Chest diagnostics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Digital luminescent radiography enables dual-energy subtraction imaging, because this computed system allows susbtraction of imaging data and image post processing, as for example special windowing or edge enhancement. In a special cassette a copper filter is placed between two imaging plates for energy separation by a single X-ray exposure. Image post-processing with subtraction of imaging data permits the elimination of either skeleton or soft tissue structures. The influence of filter thickness, tube voltage and the X-ray exposure dosage on image quality is examined by the use of an anthropomorphic quality is examined by the use of an anthropomorphic phantom of the chest. According to our initial results dual energy subtraction imaging in one-shot-technique seems to be useful in the diagnostics of skeletal lesions and especially pulmonary nodules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00595841
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  • 3
    Electronic Resource
    Electronic Resource
    Digital luminescent radiography for diagnosis of skeletal injuries (1992)
    Springer
    European radiology 2 (1992), S. 542-547 
    Details
    ISSN: 1432-1084
    Keywords: Digital luminescence radiography ; Skeletal diagnosis ; Traumatology ; Standard digital images ; Image post-processing ; Creation of artefacts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the course of a comparative study 231 patients with traumatic lesions in skeletal and soft tissue areas were X-rayed using conventional film radiography and digital luminescence radiography (DLR). The results were evaluated by radiologists and traumatologists on the basis of optimised image post-processing in addition to the standard digital presentations. The imaging quality of compacta, spongiosa, soft tissues, fracture lines and osteosynthesis material was assessed in comparison with the screen-film images. Whereas the standard digital presentation in the “conventionally adjusted” imaging mode was inferior to the screen-film radiograph, the “edge-enhanced” standard presentation proved to be advantageous in the imaging of soft tissues (frequency of first-place ratings: DLR conventional 6%, screen-film system 21%, DLR edge-enhanced 31%). In the overall evaluation high-frequency filtered inverse image post-processing showed the highest diagnostic potential (frequency of first-place ratings: 41%). A conclusive assessment of metal implants is hindered by overshoot artefacts and can only be achieved through time-consuming post-processing of the stored image data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187549
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Unsharp masking of low-dosed digital luminiscence radiographs: results of a receiver operating characteristics analysis (1996)
    Springer
    European radiology 6 (1996), S. 526-531 
    Details
    ISSN: 1432-1084
    Keywords: Chest diagnostics ; Projection radiography ; High-amplification screen-film systems ; Digital luminiscence radiography ; Filter kernel
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The extent to which the diagnostic performance of low-dosed storage phosphors can be improved by suitable image postprocessing was investigated. Storage phosphors radiographs and conventional 200- and 400-speed screen-film combinations of an antropomorphic chest phantom with simulated nodules and linear structures were compared. The detection of test bodies was determined in an ROC analysis based on 16 200 individual observations. The two analog screen-film systems did not differ significantly. As far as the storage phosphor radiographs are concerned, a higher diagnostic performance was achieved with a large filter kernel (S 40), whereas small filter kernels and edge-enhanced imaging modes reduced the detection of detail. The image quality of low-dosed storage phosphors is thus similar to high-amplification screen-film combinations if large filter kernels are used in postprocessing of the image.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00182488
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Detection of radiographic findings in lung fibrosis using storage phosphor plates (1997)
    Springer
    European radiology 7 (1997), S. 576-582 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Digital radiography ; Storage phosphorous plates ; Image postprocessing ; Chest radiography ; Lung fibrosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The aim of this work was to examine the influence of the filter kernel size on the detectability of differing radiological findings in interstitial lung disease. In 97 patients with confirmed pulmonary fibrosis chest radiographs were obtained with a film-screen system of speed class 200 and with correspondingly exposed storage phosphorous plates. The size of the filter kernel used for the image postprocessing varied between sigma 5 and sigma 70. The detectability of interstitial lung changes was evaluated independently by eight readers on the basis of a defined rating system. The results were analysed using multifactorial analysis of variance with Scheffé test at a significance level of p = 0.05. Small kernel sizes (S 5, S 10) combined with high edge enhancement were only of benefit in the imaging of septal lines, but reduced the detectability of nodular and reticular structures. Good detail detectability of both micronodules and septal lines was obtained with a medium kernel size of sigma 40. Storage phosphor radiography utilizing the appropriate choice of postprocessing parameters provides equivalent image quality for evaluating interstitial lung changes compared with a modern film-screen technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050209
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Changes in muscle blood flow after smoking a cigarette determined by a new noninvasive method (1989)
    Springer
    European journal of clinical pharmacology 37 (1989), S. 517-520 
    Details
    ISSN: 1432-1041
    Keywords: nicotine ; epinephrine ; cigarette smoking ; total forearm blood flow ; muscle blood flow ; plethysmography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary In 9 healthy subjects the effect of smoking one cigarette (nicotine content 0.9 mg) on blood pressure, heart rate and total and muscle blood flow in the forearm was measured. Blood flow was measured by a new noninvasive plethysmographic method that simultaneously gives quantitative data about total and muscle blood flow. Smoking the cigarette did not significantly affect blood pressure or heart rate. Total blood flow in the forearm did not change but the flow to the muscle was increased and resistance in this vascular bed was decreased. The pattern of haemodynamic changes in the forearm indicates that epinephrine may be the mediator of the circulatory effects of nicotine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00558134
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    Paper (German National Licenses)
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