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Implanted medical devices such as cardiac pacemakers pose a potential hazard in magnetic resonance imaging. Electromagnetic fields have been shown to cause severe radio frequency-induced tissue heating in some cases. Imaging exclusion zones have been proposed as an instrument to reduce patient risk. The purpose of this study was to further assess the impact of the imaging landmark on the risk for unintended implant heating by measuring the radio frequency-induced electric fields in a body phantom under several imaging conditions at 1.5T. The results show that global radio frequency-induced coupling is highest with the torso centered along the superior-inferior direction of the transmit coil. The induced E-fields inside the body shift when changing body positioning, reducing both global and local radio frequency coupling if body and/or conductive implant are moved out from the transmit coil center along the z-direction. Adequate selection of magnetic resonance imaging landmark can significantly reduce potential hazards in patients with implanted medical devices. Magn Reson Med, 2010. (c) 2010 Wiley-Liss, Inc.
Department of Internal Medicine I, University Hospital Würzburg, Julius-Maximilians-University, Würzburg, Germany.
This article was published in the following journal.
Several risk factors for pacemaker (PM) related complications have been reported. However, no study has investigated the impact of lead characteristics on pacemaker-related complications.
Building on the theoretical arguments of the impersonal-impact and differential-impact hypotheses, this study has a twofold purpose: first, to demonstrate how fear-arousing media messages about risk a...
The self-heating effect of a graphene transistor on the transport properties was studied. Different dielectric layers, SiO2 and AlN, which have different thermal conductivities, were used to tune the ...
Disruptions in thalamic functional connectivity have been observed in people with schizophrenia and in youth at clinical high risk (CHR) of psychosis. However, the impact of environmental risk factors...
Osteonecrosis of the jaws (ONJ) is an entity of major clinical impact characterized by chronically exposed necrotic mandibular or maxillary bone. Its clinicopathological characteristics and possible i...
The purpose of this study is to monitor and follow non-pacemaker dependent patients with implanted permanent pacemakers, who undergo medically required MRI scans. Patients with pacemakers...
A single-center registry to prospectively evaluate the safety of non-cardiac/non-thoracic magnetic resonance imaging (MRI) in patients with implanted cardiac devices (pacemakers and implan...
Using randomization, prospectively determine superiority of either ultrasound-guided or landmark-guided biceps corticosteroid injections with regard to various clinical variables.
The effect of heating precondition of streamlined liner of the pharynx airway (SLIPA) on respiratory mechanics and sore throat was investigated.
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The use of molecularly targeted imaging probes to localize and/or monitor biochemical and cellular processes via various imaging modalities that include RADIONUCLIDE IMAGING; ULTRASONOGRAPHY; MAGNETIC RESONANCE IMAGING; fluorescence imaging; and MICROSCOPY.
Any system which allows payors to share some of the financial risk associated with a particular patient population with providers. Providers agree to adhere to fixed fee schedules in exchange for an increase in their payor base and a chance to benefit from cost containment measures. Common risk-sharing methods are prospective payment schedules (PROSPECTIVE PAYMENT SYSTEM), capitation (CAPITATION FEES), diagnosis-related fees (DIAGNOSIS-RELATED GROUPS), and pre-negotiated fees.
Removal of tissue by vaporization, abrasion, or destruction. Methods used include heating tissue by hot liquids or microwave thermal heating, freezing (CRYOABLATION), chemical ablation, and photoablation with LASERS.
Electric conductors through which an electric current enters or leaves a medium. When inserted, usually surgically, they are referred to as implanted electrodes.
Reduction of high-risk choices and adoption of low-risk quantity and frequency alternatives.
Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...