High-resolution magnetic resonance cholangiography (MRC) with adaptive averaging: diagnostic performance evaluation
| Autor: | Richard T. Black, R Beavon, Evis Sala, Z Abubacker, Lucy E Kershaw, Martin J. Graves, Jane Skinner, David J. Lomas |
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| Rok vydání: | 2006 |
| Předmět: |
Adult
Male medicine.medical_specialty Adolescent Cholangiopancreatography Magnetic Resonance Biliary Tract Diseases High resolution Intrahepatic duct Phased array coil Cholangiography Humans Medicine Radiology Nuclear Medicine and imaging Aged Aged 80 and over Magnetic resonance cholangiopancreatography medicine.diagnostic_test business.industry Magnetic resonance imaging General Medicine Middle Aged Torso Visualization medicine.anatomical_structure Female Radiology business |
| Zdroj: | Clinical Radiology. 61:766-770 |
| ISSN: | 0009-9260 |
| Popis: | To evaluate the diagnostic performance of an interactive, adaptively averaged (AA) two-dimensional (2D) magnetic resonance cholangiography (MRC) technique in patients with suspected biliary disease by comparison to the standard MRC technique.The AA 2D MRC method registers the images after acquisition, allowing summation of multiple images to improve the signal:noise ratio (SNR) and thereby potentially improve the visualization of bile ducts. One hundred and twenty-eight patients underwent both 2D conventional and AA magnetic resonance cholangiopancreatography (MRCP). Twenty-seven patients were excluded from the analysis as AA images could not be properly obtained due to technical failures. All examinations were performed using a 1.5 T whole-body MR system and a four-channel torso phased array coil. Images of 101 patients were adaptively averaged using an in-house developed program written in IDL. Two readers qualitatively evaluated the studies in consensus, blinded to acquisition details and without knowledge of clinical information.The AA technique was significantly better than the conventional 2D MRC for the visualization of the second-order branch intrahepatic ducts (p00001). Overall, there was no significant difference in the diagnostic confidence between two techniques (p=0.12). However, the AA technique showed a trend towards more confident diagnosis of biliary strictures (p=0.055), likely due to better diagnostic confidence in identifying second order branch intrahepatic duct strictures (p=0.054).Excluding those patients those patients in whom either satisfactory respiratory gating or a suitable kernel placement was not achieved, AA 2D MRC demonstrated a significant improvement in visualization of intrahepatic duct branches compared to standard MRC. |
| Databáze: | OpenAIRE |
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