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  • 1
    Electronic Resource
    Electronic Resource
    MR arthrography of elbow: evaluation of the ulnar collateral ligament of elbow (1996)
    Springer
    Skeletal radiology 25 (1996), S. 629-634 
    Details
    ISSN: 1432-2161
    Keywords: Key words Elbow ; Ulnar collateral ligament ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Objective. The purpose of this study was to evaluate ulnar collateral ligament (UCL) injury of the elbow in throwing athletes by MRI and MR arthrography. Design. Ten elbows of throwing athletes were examined on both plain MRI and MR saline arthrography and the injuries subsequently surgically proven. Spin-echo (SE) T1-weighted and fast SE T2-weighted coronal images were obtained. Results. The UCL was unclear in all ten cases on T1-weighted MRI. In five cases an avulsion fracture was also found on T1-weighted MRI. On T2-weighted MRI, abnormal high-intensity areas were identified in or around the UCL. On T2-weighted MR arthrography images, extracapsular high-intensity areas, which represent extracapsular leakage, were found in four of five cases with avulsion fracture. At surgery, all these four cases showed avulsion fractures with instability; the other case had a fracture but it was stable and adherent to the humerus. On T2-weighted MR arthrography images, an extracapsular high-intensity area was found in one of the five cases without avulsion fracture. At surgery this patient had a complete tear of the UCL itself. Conclusion. MR arthrography provided additional information for evaluating the degree of UCL injury.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002560050149
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  • 2
    Electronic Resource
    Electronic Resource
    Serial changes on MRI in lumbar disc herniations treated conservatively (1995)
    Springer
    Neuroradiology 37 (1995), S. 378-383 
    Details
    ISSN: 1432-1920
    Keywords: Lumbar disc herniation ; Conservative treatment ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Using serial MRI, we studied 32 patients with herniated lumbar discs, treated conservatively, to clarify the natural history of this condition. MRI was performed in the acute stage, then 6 months and 1 year later. On axial images, the proportion of the cross-sectional area of the spinal canal occupied by the herniated disc was 31.9% on the average on the initial scan, 28.7% 6 months and 25.3% 1 year later. The size of the herniation decreased by more than 20% in 11 patients (34%), by 10–20 % in 8 (28%) and was unchaged in 12 (38%). The height of the disc slightly decreased with time, but there was no significant change in the angle of lordosis in the affected segment. The initial MRI revealed degeneration of all affected discs, and progressive degeneration was observed in 9 patients. The more degenerate the disc and the larger the initial herniation the more the size of the herniated fragment decreased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00588017
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spinocerebellar ataxia type 6: MRI of three Japanese patients (1998)
    Springer
    Neuroradiology 40 (1998), S. 222-227 
    Details
    ISSN: 1432-1920
    Keywords: Key words Spinocerebellar ataxia type 6 ; Cerebellar cortical atrophy ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We describe the MRI findings in three Japanese patients with spinocerebellar ataxia type 6 (SCA6) in which a polymorphic CAG repeat was identified in the gene encoding the α1A voltage-dependent P/Q-type Ca2+ channel subunit (CACNL1A4). All showed slowly progressive cerebellar ataxia and mild pyramidal signs. Neuroradiologically, they had moderate cerebellar atrophy, most prominently in the superior vermis, whereas the brain stem appeared to be spared. No abnormal signal intensity was identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050571
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic resonance signal intensity and volume changes after endovascular treatment of intracranial aneurysms causing mass effect (1998)
    Springer
    Neuroradiology 40 (1998), S. 184-188 
    Details
    ISSN: 1432-1920
    Keywords: Key words Aneurysm intracranial ; Magnetic resonance imaging ; Embolisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To determine when and how intracranial aneurysms causing mass effect change following endovascular treatment, we used MRI to assess patients for 2–3 years after the interventional procedure. Nine patients who had aneurysms compressing the surrounding structures underwent endovascular treatment. Proximal occlusion of the parent artery was performed in seven cases, and in two the aneurysm was embolised with microcoils. After embolisation, signal intensity within aneurysms tended to be high on both T1- and T2-weighted images. When there was rapid reduction in size high-signal zones within aneurysms became isointense or gave low signal on T1-weighted images. On T2-weighted images, isointense or low-signal foci appeared within high-signal areas in the aneurysm, giving mixed intensity. In typical cases, the mean volume of the aneurysm fell to approximately 30 % of its initial value 2–12 months after treatment. After this, no additional reduction was observed. The aneurysms which showed little signal intensity change tended to shrink more slowly and to a lesser degree than the more typical cases. Aneurysms which gave high signal on both T1- and T2-weighted images early following embolisation shrank more quickly than those showing little signal change.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050565
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic resonance imaging and brain-stem auditory evoked potentials in neuro-Behcet's disease (1994)
    Springer
    Journal of neurology 241 (1994), S. 481-486 
    Details
    ISSN: 1432-1459
    Keywords: Neuro-Behcet's disease ; Magnetic resonance imaging ; Brain-stem auditory evoked potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We studied central nervous system lesions in patients with neuro-Behcet's disease using magnetic resonance imaging (MRI) of the brain and recording of brain-stem auditory evoked potentials (BAEPs). MRI revealed abnormal findings in seven of eight patients. MRI studies demonstrated extensive regions with high intensity signal in the brain stem and/or basal ganglia on T2-weighted images obtained during the acute stage of the disease in three patients. One of these patients had a strongly gadolinum-enhanced round lesion in the lower pons. In four of the other five patients with chronic disease, brain-stem atrophy was observed on T1-weighted images. Atrophic changes were more severe in the brain stem than in the cerebellum. Abnormal BAEPs were observed in three patients and consisted of prolongation of interpeak latency of waves III-V and defects of wave III or V. Abnormal BAEPs were recorded in patients with severe inflammatory changes or progression of atrophic changes in the brain stem. Our findings show that MRI and BAEPs are useful in detecting the presence and assessing the degree of neurological involvement in patients with neuro-Behcet's disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00919709
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Evaluation of an in vivo labeling method of red blood cells with99mTc-pertechnetate in the head and neck region (1994)
    Springer
    Oral radiology 10 (1994), S. 35-42 
    Details
    ISSN: 1613-9674
    Keywords: 99mTc-RBC method ; Angiomatous lesions ; Magnetic resonance imaging ; Metal artifact ; Dental prostheses
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Seventeen cases in which red blood cells (RBCs) were labeled with99mTc (99mTc-RBC method) are reviewed to confirm the vascular nature of lesions. This study was undertaken to see whether the99mTc-RBC method is useful in terms of detecting angiomatous lesions, and also to determine the indications for this method. In one case, total removal revealed a good, correlation between the range of uptake and the actual tumor size. MR images definitively demonstrated tumor location and extension. When hemangioma is suspected, MR examination is the preferred modality to determine tumor extension, tumor mass, and invasion into the surrounding tissue. However, when it is suspected that the MR image is poor due to bulky metal artifacts, as in the case of dental prostheses, the99mTc-RBC method should be used because this method is only slightly influenced by metal artificts. In addition, this method should be applied when whole body screening is needed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02390714
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Estimation of absorbed dose for 2-[F-18]fluoro-2-deoxy-d- glucose using whole-body positron emission tomography and magnetic resonance imaging (1998)
    Springer
    European journal of nuclear medicine 25 (1998), S. 565-574 
    Details
    ISSN: 1619-7089
    Keywords: Key words: Absorbed Dose ; S-value ; MIRD phantom ; Whole-body positron emission tomography ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The purpose of this study was to measure the cumulated activity and absorbed dose in organs after intravenous administration of 2-[F-18]fluoro-2-deoxy-d-glucose (18F-FDG) using whole-body positron emission tomography (PET) and magnetic resonance imaging (MRI). Whole-body dynamic emission scans for 18F-FDG were performed in six normal volunteers after transmission scans. The total activity of a source organ was obtained from the activity concentration of the organ measured by whole-body PET and the volume of that organ measured by whole-body T1-weighted MRI. The cumulated activity of each source organ was calculated from the time-activity curve. Absorbed doses to the individuals were estimated by the MIRD (medical internal radiation dosimetry) method using S-values adjusted to the individuals. Another calculation of cumulated activities and absorbed doses was performed using the organ volumes from the MIRD phantom and the ”Japanese reference man” to investigate the discrepancy of actual individual results against the phantom results. The cumulated activities of 18 source organs were calculated, and absorbed doses of 27 target organs estimated. Among the target organs, bladder wall, brain and kidney received the highest doses for the above three sets of organ volumes. Using measured individual organ volumes, the average absorbed doses for those organs were found to be 3.1×10–1, 3.7×10–2 and 2.8×10–2 mGy/MBq, respectively. The mean effective doses in this study for individuals of average body weight (64.5 kg) and the MIRD phantom of 70 kg were the same, i.e. 2.9×10–2 mSv/MBq, while for the Japanese reference man of 60 kg the effective dose was 2.1×10–2 mSv/MBq. The results for measured organ volumes derived from MRI were comparable to those obtained for organ volumes from the MIRD phantom. Although this study considered 18F-FDG, combined use of whole-body PET and MRI might be quite effective for improving the accuracy of estimations of the cumulated activity and absorbed dose of positron-labelled radiopharmaceuticals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002590050257
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    Paper (German National Licenses)
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