MR safety assessment of active implantable medical devices.

CONCLUSION: The test methods should be planned to be as conservative as possible to cover the worst case scenario. However, in vitro measurements and computer simulation are far from being able to cover all possible configurations in their complexity and uniqueness. For safer MR examinations, current research recommends in vivo testing prior to MR, parallel radiofrequency transmission techniques, and new sequences with reduced energy input in the presence of AIMDs. PMID: 31321466 [PubMed - as supplied by publisher]
Source: Der Radiologe - Category: Radiology Authors: Tags: Radiologe Source Type: research

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Conclusion: An international consensus definition for the rectum is the point of the sigmoid take-off as visualized on imaging. The sigmoid take-off can be identified as the mesocolon elongates as the ventral and horizontal course of the sigmoid on axial and sagittal views respectively on cross-sectional imaging. Routine application of this landmark during multidisciplinary team discussion for all patients will enable greater consistency in tumour localisation.
Source: Annals of Surgery - Category: Surgery Tags: SURGICAL PERSPECTIVES Source Type: research
Conclusion: MR-HIFU delivery during forced breath holds enables stable control of mild hyperthermia in targets adjacent to moving anatomical structures. PMID: 31707872 [PubMed - in process]
Source: International Journal of Hyperthermia - Category: Internal Medicine Tags: Int J Hyperthermia Source Type: research
Authors: Farhat NS, Theiss R, Santini T, Ibrahim TS, Aizenstein HJ Abstract Cerebral small vessel disease is associated with late-life depression, cognitive impairment, executive dysfunction, distress, and loss of life for older adults. Late-life depression is becoming a substantial public health burden, and a considerable number of older adults presenting to primary care have significant clinical depression. Even though white matter hyperintensities are linked with small vessel disease, white matter hyperintensities are nonspecific to small vessel disease and can co-occur with other brain diseases. Advanced neuroi...
Source: Advances in Experimental Medicine and Biology - Category: Research Tags: Adv Exp Med Biol Source Type: research
In this study, we used magnetic resonance imaging (MRI) of distal radius ossification to obtain data for age estimation. Wrist MRI scans from 338 individuals, aged 10 –29 years, were examined retrospectively using the staging system of Schmidt et al. and the extension of the stages as described by Timme et al. The results revealed that the minimum ages for stage 4a ossification were 16.0 years in women and 17.7 years in men, whereas those for stage 4b ossificat ion were 16.6 and 18.2 years in women and men, respectively. Stage 5 was not detected in any patient. These results were comparable with those of a previous s...
Source: International Journal of Legal Medicine - Category: Medical Law Source Type: research
AbstractIn a case of a fatal traffic accident, a suspicious finding was identified in the muscular tissue of the left thigh by whole-body postmortem computed tomography. To better interpret the finding, the lower extremities were investigated by magnetic resonance imaging (MRI) and proton magnetic resonance spectroscopy (1H-MRS). MRI revealed the presence of an evenly distributed intramuscular fluid and1H-MRS of a volume within the fluid detected concentrations of acetate and lactate. The fluid was assumed to be an extravasation of an intraosseous infusion, erroneously administered to the intermediate vastus of the left th...
Source: International Journal of Legal Medicine - Category: Medical Law Source Type: research
ConclusionsNeither MRI nor US showed satisfactory diagnostic test accuracy in detecting bone erosion. However, the 1.5-T Signa MRI system, General Electric ©, and different models of LOGIQ US units and General Electric© showed similarly good performance in detecting bone erosion in RA patients, while the 2nd metacarpophalangeal joint is the best recommended scanning position during US.Key Points:• In this study, we evaluated the diagnostic accuracy of US and MRI for bone erosion in RA patients, neither MRI nor US showed perfect diagnostic test accuracy.• 1.5-T Signa system and the LOGIQ units both from ...
Source: Clinical Rheumatology - Category: Rheumatology Source Type: research
This article provides an overview of normal anatomy of the pelvic floor as seen on magnetic resonance imaging, ultrasound, and fluoroscopic studies performed in the evaluation of pelvic floor function.
Source: Abdominal Imaging - Category: Radiology Source Type: research
ConclusionStandard clinical MRI investigations may result in pronounced heating at the tip of epicardial electrodes. Epicardial leads, which are not connected to a pacemaker and thus mimicking abandoned leads, may even result in a more pronounced rise in temperature at the lead tip. Therefore, current epicardial pacing systems may carry a substantial risk of inducing thermal damage of the neighboring tissue during MRI scanning.
Source: Journal of Interventional Cardiac Electrophysiology - Category: Cardiology Source Type: research
Conclusions: Use of the FD with adjunctive loose coil embolization might help to alleviate the compressional symptoms caused by intracranial aneurysms. Shrinkage of the aneurysm, a short duration of symptoms, and younger patient age might contribute to favorable outcomes of mass effect-related symptoms.
Source: Frontiers in Neurology - Category: Neurology Source Type: research
Publication date: Available online 10 November 2019Source: Journal of NeuroradiologyAuthor(s): Yeonah Kang, Kuo-Chen Wei, Cheng Hong TohAbstractPurpose: To evaluate the potential of quantitative dynamic susceptibility contrast (DSC) perfusion MR imaging parameters as imaging biomarkers for predicting intraoperative blood loss in meningioma.Methods: Fifty-one non-embolized meningioma patients who had undergone preoperative DSC perfusion MR imaging were retrospectively included. The corrected relative cerebral blood volume (rCBV) and leakage coefficient (K2) of the entire enhanced tumor were obtained using leakage correction...
Source: Journal of Neuroradiology - Category: Radiology Source Type: research
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