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  • 1
    Online Resource
    Online Resource
    Berlin : Springer
    Keywords: Kernspintomografie ; Nuclear medicine ; Radiology, Medical ; Radiotherapy ; Kernspintomografie
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (XXVII, 1511 S.) , zahlr. Ill., graph. Darst.
    ISBN: 9783540293552
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    World journal of urology 10 (1992), S. 154-160 
    ISSN: 1433-8726
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary At present, MRI of the kidney is considered to be a problem-solving imaging modality that is complementary to CT and ultrasound. The anatomy of the kidney and perirenal space is consistently visualized on MRI, which provides excellent demonstration of the corticomedullary differentiation on T1-weighted images. The indistinctness or obliteration of corticomedullary differentiation is a sensitive but nonspecific finding. The large field of view provided by MRI facilitates the diagnosis of congenital anomalies, but the high cost of the examination precludes its use as a primary imaging method. The use of contrast media has expanded the application of MRI into the detection and characterization of renal masses. However, the greatest value of MRI lies in the staging of renal-cell carcinoma, specifically in cases in which CT and ultrasound findings have proved to be inconclusive. The main advantages provided by MRI in such cases involve the assessment of vascular patency and the evaluation of direct tumor extension.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Abdominal imaging 17 (1992), S. 347-352 
    ISSN: 1432-0509
    Keywords: Bile ducts, MR studies, neoplasms, diseases ; Bile duct radiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The authors compared computed tomography (CT) and endoscopic retrograde cholangiopancreatography (ERCP), techniques commonly used to study the biliary tree, with pre- and post-Gd-DTPA breath-hold fast low angle shot (FLASH) and fat suppressed spin-echo in 28 consecutive patients with bile duct abnormalities detected on ERCP, including 11 patients with malignant disease and 17 patients with benign disease. ERCP, CT, and magnetic resonance (MR) images were prospectively interpreted in a blinded fashion and reviewed by consensus. ERCP characterized all cases of malignant disease by the presence of a narrowed bile duct lumen with irregular margins. CT and MRI detected all cases of malignant disease and characterized nine of 11 as malignant. In seven of these cases, CT and MRI showed thickening of extrahepatic bile duct walls 〉5 mm. MRI images showed intrahepatic-enhancing periportal tissue in four cases, which was not seen on CT images, and which was biopsyproven tumor extension. Benign disease was characterized on ERCP images by the demonstration of smooth tapered narrowings in 16 cases, whereas on CT and MR images it was characterized by mild to moderate dilatation of the intrahepatic bile ducts and wall thickness 〈 5 mm in 13 cases. Overall ERCP correctly characterized 27 cases as benign or malignant and CT and MRI both characterized 25. The results of this study show a trend that ERCP is superior to CT and MRI for characterizing bile duct disease.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Abdominal imaging 18 (1993), S. 56-60 
    ISSN: 1432-0509
    Keywords: Liver, MR studies ; MR, pulse sequences ; MR, rapid imaging ; Liver neoplasms ; MR studies ; MR, contrast enhancement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The role of excitation-spoiling fat suppression (fatsat) imaging in the detection of liver lesions was assessed comparing short TR/TE and long TR/ TE spin-echo (SE) sequences with and without excitation-spoiling fat suppression in 25 patients at 1.5T. The study included patients with liver metastases (n = 21), primary liver cancer (n=3), and hepatic adenoma (n=1). Liver lesion detection and lesionliver signal-to-noise ratios (SNR) were determined for the various imaging sequences in a prospective fashion. Liver lesion-liver SNR were highest for long TR/TE (2000-2500/70-80) fatsat images (12.7±4.8) compared to long TR/TE regular SE (2000-2500/70-80) images (8.8±5.6) [(p = ns) (not significant)], short TR/TE (200-400/15-20) fatsat images (-6.2±4.8) (p=0.05), and short TR/TE regular SE images (-4.9±3.2) (p〈0.01). Lesion detection was greatest for long TR/TE fatsat (86) followed by long TR/TE regular SE (78) (p=0.05), short TR/TE fatsat (65) (p〈0.01), and short TR/TE regular SE (60) (p〈0.01). The results of this study suggest that excitation-spoiling fat suppression may improve liver lesion detection and conspicuity.
    Type of Medium: Electronic Resource
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