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Dive into the research topics where Ulrike Rapp-Bernhardt is active.

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Featured researches published by Ulrike Rapp-Bernhardt.


European Radiology | 2000

Diagnostic potential of virtual bronchoscopy: advantages in comparison with axial CT slices, MPR and mIP?

Ulrike Rapp-Bernhardt; T. Weite; W. Doehring; Siegfried Kropf; Thomas M. Bernhardt

The aim of this study was to evaluate the diagnostic potential of virtual endoscopy (VE) and to compare it with axial CT slices, multiplanar reconstructions (MPR), minimal intensity projections (mIP), and bronchoscopy in patients diagnosed with bronchogenic carcinoma. Thirty patients underwent a spiral CT. Axial CT images were transferred to an Onyx workstation (Silicon Graphics, Sun Microsystems, Mountain View, Calif.) for performing virtual endoscopy. Accuracy for this procedure was tested by three radiologists on a monitor in comparison with axial CT slices, MPR, mIP, and bronchoscopy concerning the localization and degree of stenoses. Endoluminal tumors were identified by virtual bronchoscopy with no statistically significant difference of localization or grading of stenosis in comparison with bronchoscopy, axial CT slices, MPR and mlP. Axial CT slices, MPR, and mlP showed poorer results with over- or underestimation of stenoses compared with VE and bronchoscopy. Passing of stenoses was only possible with VE in 5 patients. Virtual endoscopy is a non-invasive method for identification of endoluminal tumors and is comparable to real bronchoscopy.


Investigative Radiology | 2004

Diagnostic performance of a flat-panel detector at low tube voltage in chest radiography: a phantom study.

Thomas M. Bernhardt; Ulrike Rapp-Bernhardt; Horst Lenzen; Friedrich W. Röhl; F. Stefan Diederich; Karsten Papke; Karl Ludwig; Walter Heindel

Rationale and Objectives:To evaluate a large area, cesium iodide amorphous silicon flat-panel detector (CsI/a-Si) at 3 tube voltages to detect simulated interstitial lung disease, nodules, and catheters. Methods:Simulated interstitial lung disease, nodules, and catheters were superimposed over a chest phantom. Images were generated at 125 kVp, 90 kVp, and 70 kVp at the same surface dose and reduced effective dose equivalent for 90 kVp and 70 kVp and printed on hard copies. Fifty-four thousand observations were analyzed by receiver operating characteristic (ROC). Results:Detectability of linear, miliary, reticular pattern, and nodules over lucent lung as well as of catheters and nodules over obscured chest areas increased at 90 and/or 70 kVp with higher Az values; however, only it was statistically significant for reticular pattern at 70 kVp and nodules at 90 kVp compared with 125 kVp (P <0.05). The detection of ground-glass pattern was worse at lower kVp (P >0.05). Conclusion:For most simulated patterns, differences in diagnostic performance at 70 kVp/90 kVp and 125 kVp were not significant, except for reticular pattern and nodules over lucent lung.


Investigative Radiology | 2005

Portable flat-panel detector for low-dose imaging in a pediatric intensive care unit: comparison with an asymmetric film-screen system.

Ulrike Rapp-Bernhardt; Friedrich-Wilhelm Roehl; Rainer Esseling; Horst Lenzen; Manfred Schiborr; Iris Theobald-Hormann; Walter Heindel; Thomas M. Bernhardt

Objective:We sought to evaluate the diagnostic performance of a portable indirect flat-panel detector for low-dose imaging as compared with an asymmetric film-screen system in a pediatric intensive care unit. Materials and Methods:A total of 120 neonates underwent chest radiographs using a portable flat-panel detector (digital speed 800) and an asymmetric film-screen system (400 speed). Four readers evaluated the detection of 11 anatomic and 5 pathologic landmarks and 4 support devices. Statistical analysis was performed using repeated analysis of variance. The level of statistical significance was P = 0.05. Results:The detection of 4 anatomic/4 pathologic landmarks and 2 support devices was significantly better using the flat-panel detector as compared with the asymmetric film-screen system (P < 0.05). Another 8 anatomic and one pathologic landmarks were detected equally well or slightly better with the flat-panel detector (P > 0.05). Conclusions:The portable flat-panel detector offers the potential of a 50% dose reduction with equal or significantly better detection of clinically important structures.


The Journal of Thoracic and Cardiovascular Surgery | 2002

Diameters of the thoracic aorta throughout life as measured with helical computed tomography

Alfred Hager; Harald Kaemmerer; Ulrike Rapp-Bernhardt; Sebastian Blücher; Karl Rapp; Thomas M. Bernhardt; M. Galanski; John Hess


Biology and Fertility of Soils | 1999

Quantitative analysis of earthworm burrow systems with respect to biological soil-structure regeneration after soil compaction

M. Langmaack; S. Schrader; Ulrike Rapp-Bernhardt; K. Kotzke


Geoderma | 2002

Soil structure rehabilitation of arable soil degraded by compaction

Marcus Langmaack; Stefan Schrader; Ulrike Rapp-Bernhardt; Karin Kotzke


Radiology | 1999

Detection of Simulated Interstitial Lung Disease and Catheters with Selenium, Storage Phosphor, and Film-based Radiography

Thomas M. Bernhardt; Dirk Otto; Gerhard Reichel; Kathrin Ludwig; Sylke Seifert; Siegfried Kropf; Ulrike Rapp-Bernhardt


European Radiology | 2003

Diagnostic potential of virtual cystoscopy of the bladder: MRI vs CT. Preliminary report

Thomas M. Bernhardt; Schmidl H; Philipp C; E. P. Allhoff; Ulrike Rapp-Bernhardt


Radiology | 1998

Subtle pulmonary abnormalities: detection on monitors with varying spatial resolutions and maximum luminance levels compared with detection on storage phosphor radiographic hard copies.

Dirk Otto; Thomas M. Bernhardt; Ulrike Rapp-Bernhardt; Kathrin Ludwig; A Kästner; U B Liehr; W Döhring


Radiology | 2003

Flat-panel x-ray detector based on amorphous silicon versus asymmetric screen-film system: phantom study of dose reduction and depiction of simulated findings.

Ulrike Rapp-Bernhardt; Friedrich W. Roehl; Robert C. Gibbs; Hagen Schmidl; Ulrich W. Krause; Thomas M. Bernhardt

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Thomas M. Bernhardt

Otto-von-Guericke University Magdeburg

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Dirk Otto

Otto-von-Guericke University Magdeburg

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Kathrin Ludwig

Otto-von-Guericke University Magdeburg

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E. P. Allhoff

Otto-von-Guericke University Magdeburg

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