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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.
Over one million total joint replacement surgeries were performed in the US in 2013 alone, and this number is expected to more than double by 2030. Traditional imaging techniques for postoperative eva...
OBJECTIVE The aim of this study was to evaluate the safety of 3-T MRI in patients with implanted deep brain stimulation (DBS) systems. METHODS This study was performed in 2 phases. In an initial phant...
The wearable cardioverter defibrillator (WCD) is an important approach for better risk stratification, applied to patients considered to be at high risk of sudden arrhythmic death. Patients with impla...
The increasing use of multiple radiofrequency (RF) transmit channels in magnetic resonance imaging (MRI) systems makes it necessary to rigorously assess the risk of RF-induced heating. This risk is es...
Implanted cardiac arrhythmia devices can detect atrial tachyarrhythmias (atrial high-rate episodes [AHREs]) that are considered to correlate with atrial fibrillation and risk of stroke. In the IMPACT ...
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...
Peripherally Inserted Central Catheter (PICC) are intravascular devices used on patients undergoing IV therapy. Insertion of these catheters can be achieved either by using the anatomical ...
The effect of heating precondition of streamlined liner of the pharynx airway (SLIPA) on respiratory mechanics and sore throat was investigated.
Coronary heart disease (CHD) are the leading causes of mortality and morbidity, particularly with the current context of an aging population. Prospective cohort studies, as well as analyse...
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...