Browsing by Keywords "RF heating"
Now showing items 1-8 of 8
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Measuring local RF heating in MRI: Simulating perfusion in a perfusionless phantom
(John Wiley & Sons, Inc., 2007)Purpose: To overcome conflicting methods of local RF heating measurements by proposing a simple technique for predicting in vivo temperature rise by using a gel phantom experiment. Materials and Methods: In vivo temperature ... -
Modeling of radio-frequency induced currents on lead wires during MR imaging using a modified transmission line method
(Wiley-Blackwell Publishing, 2011-11-23)Purpose: Metallic implants may cause serious tissue heating during magnetic resonance (MR) imaging. This heating occurs due to the induced currents caused by the radio-frequency (RF) field. Much work has been done to date ... -
Modeling RF heating of active implantable medical devices during MRI using safety index
(Bilkent University, 2007)Magnetic Resonance Imaging (MRI) is known as a safe imaging modality that can be hazardous for patients with active implantable medical devices, such as a pacemakers or deep brain stimulators. The primary reason for that ... -
MRI compatible lead designs for implantable medical devices
(Bilkent University, 2007)It is currently estimated that 600,000 cardiac pacemakers are implanted per year worldwide. It is expected that the usage of other stimulators such as deep brain stimulators (DBS) will reach this number in a short period. ... -
Patient’s body composition can significantly affect RF power deposition in the tissue around DBS implants: ramifications for lead management strategies and MRI field-shaping techniques
(Institute of Physics Publishing Ltd., 2021-01-13)Patients with active implants such as deep brain stimulation (DBS) devices have limited access to magnetic resonance imaging (MRI) due to risks associated with RF heating of implants in MRI environment. With an aging ... -
Reduction of implant RF heating through modification of transmit coil electric field
(WILEY, 2010-12-08)In this work, we demonstrate the possibility to modify the electric-field distribution of a radio frequency (RF) coil to generate electric field-free zones in the body without significantly altering the transmit sensitivity. ... -
RF heating of deep brain stimulation implants in open-bore vertical MRI systems: a simulation study with realistic device configurations
(International Society for Magnetic Resonance in Medicine, 2020)Purpose Patients with deep brain stimulation (DBS) implants benefit highly from MRI, however, access to MRI is restricted for these patients because of safety hazards associated with RF heating of the implant. To date, ... -
Vertical open-bore MRI scanners generate significantly less radiofrequency heating around implanted leads: A study of deep brain stimulation implants in 1.2T OASIS scanners versus 1.5T horizontal systems
(John Wiley & Sons, Inc., 2021-04-07)Purpose Patients with active implants such as deep brain stimulation (DBS) devices are often denied access to MRI due to safety concerns associated with the radiofrequency (RF) heating of their electrodes. The majority ...
