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Unlabelled: The aim of the study is to evaluate the reliability of the diffusion-weighted vs. FLAIR MR imaging in the cases of hyper acute brain stroke., Material and Methods: CT and MR standard and diffusion images observed in 29 patients affected with early brain stroke and reference CT in all the patients. Reference CT was performed 3-5 days later in all patients., Results: The pre- and post-contrast CT in 23 patients did not reveal any brain lesions. In contrary to CT areas of pathologic high signal were visualized well in diffusion MR in 20 of these patients, which supported early diagnosis. Discrete hiperintense lesions of the same locations were seen also in the FLAIR MR imaging in 19 of them. In the 6 patients CT revealed only discrete hipodense areas, which were seen more pronounced in the FLAIR and diffusion MR imaging. In the 3 cases even the second CT did not reveal stroke., Conclusions: The diffusion MR imaging in patients suspected of acute brain stroke reveals ischemic lesions earlier and more clearly than FLAIR imaging, which discrete presented the same pathological areas.

The aim of the study is to assess the new method of radiological imaging of the inner surface of a tracheobronchial tree in order to determine to what extend it can replace the standard bronchoscopy. The spiral CT examinations of 43 patients with hilar lung tumor in virtual mode had been reconstructed retrospectively and compared to the results of fiberoptic bronchoscopy. There was a significant correlation between both methods to reveal stenoses or occlusions of airway lumen. Virtual endoscopy turned out to be an unsatisfactory method in the visualisation of mucosal changes.

The aim of the study was to assess the quality of biliary tract imaging without cholangiographic contrast medium and to evaluate the usefulness of 3-D reformations in determination of ductal anatomic relationship. The spiral 5 mm CT liver scans were performed after a bolus of 150 ml i.v. contrast agent in 15 patients with a malignant obstructive jaundice. The biliary tract was separated from surrounding hepatic parenchyma with segmentation computer algorithm and then 3-D models were produced. In all the patients, both biliary anatomy and the localization and degree of segmental obstruction were visualized with satisfying quality. The 3-D sCT models of dilated biliary tract can be obtained without cholangiographic contrast agent and can clearly depict ductal anatomy and pathology.