RöFo : Fortschritte auf dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
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Comparative Study
Adjustable cerebrospinal fluid shunt valves in 3.0-Tesla MRI: a phantom study using explanted devices.
Considering the rapidly increasing number of clinical high-field MR imagers and the lack of data regarding interference with magnetically adjustable cerebrospinal fluid (CSF) shunt valves, valve safety was assessed with regard to magnetic field interactions: imaging artifacts, heating, magnetic forces, and functional changes in a phantom study at 3.0 Tesla using explanted devices as a realistic model for in vivo conditions. ⋯ Until suggestions can be made concerning the exposure of hydrocephalic patients to 3.0 T-MRI, further testing is necessary.
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Noninvasive imaging of the heart using computed tomography (CT) is an increasingly important diagnostic approach for patients with known or suspected coronary artery disease. Coronary CT angiography has recently received great attention because it provides imaging of the coronary arteries and quantification of the coronary plaque burden with a spatial and temporal resolution not available with any other noninvasive imaging test. ⋯ The discussion also touches on the future technological developments that will be necessary to further improve the acceptance and widespread clinical use of cardiac CT, focusing on radiation exposure reduction and independence from heart rate. Finally, the representatives of the four main vendors explain the most important research projects regarding cardiac CT that they plan to pursue in the near future.
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Post-contrast enhancement characteristics (PEC) are a major criterion for differential diagnosis in MR mammography (MRM). Manual placement of regions of interest (ROIs) to obtain time/signal intensity curves (TSIC) is the standard approach to assess dynamic enhancement data. Computers can automatically calculate the TSIC in every lesion voxel and combine this data to form one color-coded parametric map (CCPM). Thus, the TSIC of the whole lesion can be assessed. This investigation was conducted to compare the diagnostic accuracy (DA) of CCPM with TSIC for the assessment of PEC. ⋯ The color-coded parametric maps (CCPMs) showed a significantly higher DA compared to TSIC, in particular the sensitivity could be increased. Therefore, the CCPM method is a feasible approach to assessing dynamic data in MRM and condenses several imaging series into one parametric map.
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Comparative Study
Computer-aided detection (CAD) and assessment of malignant lesions in the liver and lung using a novel PET/CT software tool: initial results.
To determine the feasibility of a PET/CT software tool (PET computer-aided detection: PET-CAD) for automated detection and assessment of pulmonary and hepatic lesions. ⋯ Software tools for automated lesion detection and assessment are expected to improve the clinical PET/CT workflow. Before implementation in the clinical routine, further improvements to the measurement accuracy are required.