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Dive into the research topics where Brigitte Happel is active.

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Featured researches published by Brigitte Happel.


Radiologe | 1997

Radiologically occult scaphoid and wrist fractures. Preliminary results in comparison of 0.2-T and 1.0-T units

Martin Breitenseher; Siegfried Trattnig; C. Gäbler; Brigitte Happel; A. Bankier; C. Kukla; Th. Rand; H. Imhof

SummaryThe study was performed to determine the diagnostic value of different MR systems and field strengths in patients with occult scaphoid and wrist fractures. Twelve patients with clinical suspicion of a scaphoid fracture but normal plain radiographs were examined by MRI. A dedicated 0.2-T unit (Esaote) and a 1.0-T unit (NT10, Philips) were used. Coronal T1W-SE, STIR, and T2*W-GE sequences were obtained with both systems. Images were evaluated for a bone marrow abnormality, a trabecular or cortical fracture line, and were compared to the 6-week follow-up radiographs. Seven wrist fractures were found at 0.2 T and 1.0 T, proven in the follow-up radiographs. A bone marrow abnormality was present in all seven fractures on both systems. Trabecular and cortical fracture lines were visualized at 0.2 T in four cases and at 1.0 T in seven cases. Low-field MR imaging at 0.2 T and mid-field MR imaging at 1.0 T seem to be equivalent in the diagnosis of a fracture in radiographically occult scaphoid and wrist fractures. In the visualization of fracture details, important for therapeutic and prognostic considerations, 1.0 T seems to be superior.ZusammenfassungZielsetzung der Studie was es, beim Nachweis von radiologisch okkulten Kahnbeinfrakturen mittels MRT zwischen einem dedizierten 0,2-Tesla-Gerät und einem Ganzkörper-1,0-Tesla-Gerät zu vergleichen. 12 Patienten wurden mit klinischen Zeichen einer Kahnbeinfraktur, aber negativer Kahnbeinserie auf beiden MR-Systemen untersucht. Als dediziertes Niederfeldgerät wurde der Artoscan (ESAOTE) mit 0,2 Tesla verwendet und mit einem Ganzkörpermittelfeldgerät (NT10, Philips) mit 1,0 Tesla verglichen. Auf beiden Systemen wurde eine koronale T1-W-Spinecho-, -STIR- und T2*W-Gradientenechosequenz verwendet. Die Diagnose einer Fraktur erfolgte beim Vorliegen einer Knochenmarkveränderung, einer trabekulären oder kortikalen Frakturlinie. Als Goldstandard wurde der Frakturnachweis in den Röntgenverlaufskontrollen nach 6 Wochen herangezogen. Sieben Frakturen bei 6 Patienten konnten übereinstimmend auf 0,2, 1,0 Tesla und den Röntgenkontrolluntersuchungen nachgewiesen werden. Eine Knochenmarkveränderung, die bei allen 7 Frakturen vorlag, konnte übereinstimmend auf beiden MR-Systemen erkannt werden. Unterschiede fanden sich im Nachweis weiterer Frakturzeichen wie trabekuläre und kortikale Fraktur, die 4mal mit 0,2 Tesla und 7mal mit 1,0 Tesla gefunden wurden. Zur Frakturdiagnose bei radiologisch okkulten Kahnbein und Handgelenksfrakturen scheint das 0,2-Tesla-System im Vergleich zu 1,0 Tesla ausreichend zu sein. Zur therapeutisch und prognostisch relevanten Graduierung einer Fraktur erscheint das 1,0-Tesla-System überlegen.


Radiologe | 2005

Virtual multislice computed tomography cystoscopy for evaluation of urinary bladder lesions

Gertraud Heinz-Peer; Brigitte Happel; M. Memarsadeghi; T. Mang

The introduction of multislice computed tomography (MDCT) with the possibility of acquiring isotropic datasets has been an ideal prerequisite for development of virtual MDCT cystoscopy. Remarkable technical progress regarding post-processing of high-resolution 3D datasets as well as a considerable reduction of the time required for post-processing made it possible to introduce virtual MDCT cystoscopy into the clinical routine. 3D post-processing that often required 7-8 h when virtual endoscopy techniques were first developed can now be performed in less than 5 min after transfer of data to the 3D workstation. With the limitations and contraindications of conventional cystoscopy in mind, virtual MDCT cystoscopy may be seen as a valuable alternative to conventional cystoscopy for evaluation of hematuria.


Radiologe | 2008

Benign neuroendocrine and other rare benign tumors of the pancreas

Brigitte Happel; Bruno Niederle; A. Puespoek; Ahmed Ba-Ssalamah; W. Schima

Neuroendocrine tumors (NET) of the pancreas are rare neoplasms, which arise from cells of the islets of Langerhans. The most common NET are the insulinoma, gastrinoma and hormone inactive NET. Very rare entities are the schwannoma, leiomyoma, teratoma, intrapancreatic lipoma, hemangioma and the intrapancreatic accessory spleen. Essential for therapy, which in most cases is difficult, are an exact localization and various modalities of imaging diagnostics.ZusammenfassungNeuroendokrine Tumoren (NET) des Pankreas sind seltene Neoplasien, die aus Zellen der Langerhans-Inseln entstehen. Zu den häufigsten NET zählen Insulinome, Gastrinome und hormoninaktive NET. Als sehr selten auftretende Entitäten sind das Schwannom, Leiomyom, Teratom, intrapankreatische Lipom, Hämangiom sowie die intrapankreatische Nebenmilz zu nennen.Für die Therapie sind die exakte Lokalisation und verschiedene Modalitäten der bildgebenden Diagnostik, die sich in aller Regel schwierig gestaltet, essenziell.AbstractNeuroendocrine tumors (NET) of the pancreas are rare neoplasms, which arise from cells of the islets of Langerhans. The most common NET are the insulinoma, gastrinoma and hormone inactive NET. Very rare entities are the schwannoma, leiomyoma, teratoma, intrapancreatic lipoma, hemangioma and the intrapancreatic accessory spleen. Essential for therapy, which in most cases is difficult, are an exact localization and various modalities of imaging diagnostics.


Radiologe | 2008

Benigne neuroendokrine und andere seltene benigne Tumoren des Pankreas@@@Benign neuroendocrine and other rare benign tumors of the pancreas

Brigitte Happel; Bruno Niederle; A. Puespoek; Ahmed Ba-Ssalamah; W. Schima

Neuroendocrine tumors (NET) of the pancreas are rare neoplasms, which arise from cells of the islets of Langerhans. The most common NET are the insulinoma, gastrinoma and hormone inactive NET. Very rare entities are the schwannoma, leiomyoma, teratoma, intrapancreatic lipoma, hemangioma and the intrapancreatic accessory spleen. Essential for therapy, which in most cases is difficult, are an exact localization and various modalities of imaging diagnostics.ZusammenfassungNeuroendokrine Tumoren (NET) des Pankreas sind seltene Neoplasien, die aus Zellen der Langerhans-Inseln entstehen. Zu den häufigsten NET zählen Insulinome, Gastrinome und hormoninaktive NET. Als sehr selten auftretende Entitäten sind das Schwannom, Leiomyom, Teratom, intrapankreatische Lipom, Hämangiom sowie die intrapankreatische Nebenmilz zu nennen.Für die Therapie sind die exakte Lokalisation und verschiedene Modalitäten der bildgebenden Diagnostik, die sich in aller Regel schwierig gestaltet, essenziell.AbstractNeuroendocrine tumors (NET) of the pancreas are rare neoplasms, which arise from cells of the islets of Langerhans. The most common NET are the insulinoma, gastrinoma and hormone inactive NET. Very rare entities are the schwannoma, leiomyoma, teratoma, intrapancreatic lipoma, hemangioma and the intrapancreatic accessory spleen. Essential for therapy, which in most cases is difficult, are an exact localization and various modalities of imaging diagnostics.


Radiologe | 2005

Virtuelle MDCT-Zystoskopie bei der Detektion von Blasenläsionen@@@Virtual multislice computed tomography cystoscopy for evaluation of urinary bladder lesions

Gertraud Heinz-Peer; Brigitte Happel; M. Memarsadeghi; T. Mang

The introduction of multislice computed tomography (MDCT) with the possibility of acquiring isotropic datasets has been an ideal prerequisite for development of virtual MDCT cystoscopy. Remarkable technical progress regarding post-processing of high-resolution 3D datasets as well as a considerable reduction of the time required for post-processing made it possible to introduce virtual MDCT cystoscopy into the clinical routine. 3D post-processing that often required 7-8 h when virtual endoscopy techniques were first developed can now be performed in less than 5 min after transfer of data to the 3D workstation. With the limitations and contraindications of conventional cystoscopy in mind, virtual MDCT cystoscopy may be seen as a valuable alternative to conventional cystoscopy for evaluation of hematuria.


European Radiology | 2008

Comparison of 1.0 M gadobutrol and 0.5 M gadopentate dimeglumine-enhanced MRI in 471 patients with known or suspected renal lesions: results of a multicenter, single-blind, interindividual, randomized clinical phase III trial

Bernd Tombach; Klaus Bohndorf; Wolfgang Brodtrager; Claus D. Claussen; Christoph Düber; M. Galanski; Eckhardt Grabbe; Giacomo Gortenuti; Michael Kuhn; Walter Gross-Fengels; Renate Hammerstingl; Brigitte Happel; Gertraud Heinz-Peer; Gregor Jung; Thomas Kittner; Roberto Lagalla; Philipp Lengsfeld; Reinhard Loose; Raymond Oyen; Pietro Pavlica; Christiane Pering; Pozzi-Mucelli Rs; Thorsten Persigehl; Peter Reimer; Nomdo S. Renken; Götz M. Richter; Ernst J. Rummeny; Fritz Schäfer; Małgorzata Szczerbo-Trojanowska; Andrzej Urbanik


Radiologe | 1997

[MRI in radiologically occult scaphoid fractures. Initial experiences with 1.0 Tesla (whole body-middle field equipment) versus 0.2 Tesla (dedicated low-field equipment)].

Martin Breitenseher; Siegfried Trattnig; Gäbler C; Brigitte Happel; Alexander A. Bankier; C. Kukla; Thomas Rand; H. Imhof


Radiologe | 2004

[MRT of the liver. Clinical significance of nonspecific and liver-specific MRT contrast agents].

Ahmed Ba-Ssalamah; Brigitte Happel; Joachim Kettenbach; Albert Dirisamer; Fritz Wrba; Friedrich Längle; W. Schima


Radiologe | 1999

MRT des Sprunggelenks : Vergleich eines Ganzkörper-Mittelfeldgeräts (1,0 T) mit einem dedizierten Niederfeldgerät (0,2 T)

Z. Merhemic; Martin Breitenseher; Siegfried Trattnig; Brigitte Happel; C. Kukla; Thomas Rand; H. Imhof


Radiology | 2006

Enhancement Characteristics of Pheochromocytomas

Brigitte Happel; Gertraud Heinz-Peer

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Ahmed Ba-Ssalamah

Medical University of Vienna

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Gertraud Heinz-Peer

Medical University of Vienna

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H. Imhof

University of Vienna

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Siegfried Trattnig

Medical University of Vienna

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W. Schima

Medical University of Vienna

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C. Kukla

University of Vienna

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Bruno Niederle

Medical University of Vienna

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