Impact of imaging landmark on the risk of MRI-related heating near implanted medical devices like cardiac pacemaker leads.
Summary of "Impact of imaging landmark on the risk of MRI-related heating near implanted medical devices like cardiac pacemaker leads."
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.
Affiliation
Department of Internal Medicine I, University Hospital Würzburg, Julius-Maximilians-University, Würzburg, Germany.
Journal Details
This article was published in the following journal.
Name: Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonan
ISSN: 1522-2594
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/20806352
- DOI: http://dx.doi.org/10.1002/mrm.22592
Medical and Biotech [MESH] Definitions
Molecular Imaging
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.
Risk Sharing, Financial
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.
Ablation Techniques
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.
Electrodes, Implanted
Electric conductors through which an electric current enters or leaves a medium. When inserted, usually surgically, they are referred to as implanted electrodes.
Risk Reduction Behavior
Reduction of high-risk choices and adoption of low-risk quantity and frequency alternatives.
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