RöFo : Fortschritte auf dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
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MRI-imaging using a field strength above 2 Tesla -- recently termed "highfield MRI" -- has come into clinical use in the last three years. For technical reasons, the initial application of highfield MRI concentrated on examinations of the brain. By improving the technology and solving specific problems, it has now become possible to perform total body scans. ⋯ BOLD contrast fMRI, perfusion analysis and spectroscopy all seem to improve. For total body scanning, it is already possible to examine certain areas in "1.5 Tesla quality", in some cases shortening scanning time considerably. This survey summarises the present state of knowledge, realising that the presentation might not be all-comprising since progress in this field is very dynamic.
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Clinical Trial Controlled Clinical Trial
[Estimation of diffuse bone marrow infiltration of the spine in multiple myeloma: correlation of MRT with histological results].
To determine the detection of diffuse bone marrow infiltration with MRI in comparison with histopathological findings. ⋯ The sensitivity of the visual detection of diffuse multiple myeloma with unenhanced MRI is limited for low-grade or moderate infiltration, whereas the sensitivity for high grade infiltration is reliable. The specificity is high and the diagnostic confidence improves after application of contrast material with calculation of the percentage increase in signal intensity.
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Clinical Trial
[Contribution of early systole to total antegrade flow volume in breath-hold phase-contrast flow measurements].
To evaluate the contribution of early systole for the assessment of antegrade aortic flow volume by breath-hold velocity-encoded magnetic resonance (MR) flow measurements. ⋯ Flow during early systole contributes substantially to total forward flow volume in the ascending aorta. Interpolation of the early systolic up-slope is therefore recommended for the evaluation of breath-hold phase-contrast flow measurements.
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Comparative Study Clinical Trial Controlled Clinical Trial
[Comparison of a T1-weighted inversion-recovery-, gradient-echo- and spin-echo sequence for imaging of the brain at 3.0 Tesla].
The increased T1 relaxation times at 3.0 Tesla lead to a reduced T1 contrast, requiring adaptation of imaging protocols for high magnetic fields. This prospective study assesses the performance of three techniques for T1-weighted imaging (T1w) at 3.0 T with regard to gray-white differentiation and contrast-to-noise-ratio (CNR). ⋯ For unenhanced T1 w imaging at 3.0 T, the IR technique is, despite increased artifacts, the method of choice due to its superior gray-white differentiation and best overall image quality. For CE-studies, GE sequences are recommended. For cerebral imaging, SE sequences give unsatisfactory results at 3.0 T.
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Clinical Trial Controlled Clinical Trial
[MR-sialography: optimisation and evaluation of an ultra-fast sequence in parallel acquisition technique and different functional conditions of salivary glands].
To optimise a fast sequence for MR-sialography and to compare a parallel and non-parallel acquisition technique. Additionally, the effect of oral stimulation regarding the image quality was evaluated. ⋯ The optimised ss-TSE MR-sialography seems to be a fast and sufficient technique for visualisation of excretory ducts of the main salivary glands, with no elaborate post-processing needed. To improve results of MR-sialography, it is reasonable to use an oral Sialogogum.