Effects of coil dimensions and field polarization on RF heating inside a head phantom

Kangarlu, Alayar; Ibrahim, Tamer S.; Shellock, Frank G.

doi:10.1016/j.mri.2004.11.007

Cited by 29 publications

(21 citation statements)

References 20 publications

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“…Various MR phantoms have been previously developed in order to investigate the flow effects during MR imaging (Nordell et al, 1988), the signal behavior according to the B 0 strength (Uematsu et al, 2003), the metabolite quantitation of human brain by proton MR spectroscopy (Simmons et al, 1998), the properties of MRI contrast media solutions (Rohrer et al, 2005), RF heating (Kangarlua et al, 2005), the MRI pulse sequence (Thomsen et al, 1990), the effects of RF electrodes, moving artifacts (Aubé et al, 2004), reproducibility of the geometric distortion in MRI (Mizowaki et al, 2000) and MR angiography (Kramer et al, 2004). Yet there has been slow progress for developing a phantom for MRSI/MRMI, although the clinical applications of 2D-CSI MVS are increasing.…”

Section: Discussionmentioning

confidence: 99%

Development of a cone-shape phantom for multi-voxel MR spectroscopy

Woo

Kim

Jung

et al. 2007

Journal of Neuroscience Methods

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Section: Discussionmentioning

confidence: 99%

Development of a cone-shape phantom for multi-voxel MR spectroscopy

Woo

Kim

Jung

et al. 2007

Journal of Neuroscience Methods

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“…Even non-ferromagnetic implants can cause heating due to eddy currents that propagate in metals exposed to oscillating magnetic fields [102,103]. Especially orthopedic implants such as external fixation systems can cause heating in an MRI scanner [6,144,7,145,149,4,103,10,107] and some of the new implants or devices have not been tested or labeled for MRI compatibility [150]. It is therefore essential to establish a close collaboration between the radiology team, the ordering physician, and the physician who placed the implant [13].…”

Section: Implanted Devicesmentioning

confidence: 99%

Magnetic resonance safety

Sammet

2016

Abdom Radiol

140

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Magnetic Resonance Imaging (MRI) has a superior soft-tissue contrast compared to other radiological imaging modalities and its physiological and functional applications have led to a significant increase in MRI scans worldwide. A comprehensive MRI safety training to protect patients and other healthcare workers from potential bio-effects and risks of the magnetic fields in an MRI suite is therefore essential. The knowledge of the purpose of safety zones in an MRI suite as well as MRI appropriateness criteria is important for all healthcare professionals who will work in the MRI environment or refer patients for MRI scans. The purpose of this article is to give an overview of current magnetic resonance safety guidelines and discuss the safety risks of magnetic fields in an MRI suite including forces and torque of ferromagnetic objects, tissue heating, peripheral nerve stimulation and hearing damages. MRI safety and compatibility of implanted devices, MRI scans during pregnancy and the potential risks of MRI contrast agents will also be discussed and a comprehensive MRI safety training to avoid fatal accidents in an MRI suite will be presented.

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“…For example, SAR values can be decreased by careful transmit coil design [62][63][64][65][66][67][68]. Kangarlu and co-workers performed simulations and experiments to study the impact of coil length on localized heating at 8T, showing greater heating for longer coils [69]. In practice, the volume of the coil is an important determinant of the total power required to produce the B 1 field needed for a given pulse sequence with increased power requirements being associated with a greater risk of heating.…”

Section: Type Of Rf Transmit Coilmentioning

confidence: 99%

Safety of Simultaneous Scalp or Intracranial EEG during MRI: A Review

Hawsawi

Carmichael²,

Lemieux

2017

Front. Phys.

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Understanding the brain and its activity is one of the great challenges of modern science. Normal brain activity (cognitive processes, etc.) has been extensively studied using electroencephalography (EEG) since the 1930's, in the form of spontaneous fluctuations in rhythms, and patterns, and in a more experimentally-driven approach in the form of event-related potentials (ERPs) allowing us to relate scalp voltage waveforms to brain states and behavior. The use of EEG recorded during functional magnetic resonance imaging (EEG-fMRI) is a more recent development that has become an important tool in clinical neuroscience, for example for the study of epileptic activity. The purpose of this review is to explore the magnetic resonance imaging safety aspects specifically associated with the use of scalp EEG and other brain-implanted electrodes such as intracranial EEG electrodes when they are subjected to the MRI environment. We provide a theoretical overview of the mechanisms at play specifically associated with the presence of EEG equipment connected to the subject in the MR environment, and of the resulting health hazards. This is followed by a survey of the literature on the safety of scalp or invasive EEG-fMRI data acquisitions across field strengths, with emphasis on the practical implications for the safe application of the techniques; in particular, we attempt to summarize the findings in terms of acquisition protocols when possible.

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Effects of coil dimensions and field polarization on RF heating inside a head phantom

Cited by 29 publications

References 20 publications

Development of a cone-shape phantom for multi-voxel MR spectroscopy

Development of a cone-shape phantom for multi-voxel MR spectroscopy

Magnetic resonance safety

Safety of Simultaneous Scalp or Intracranial EEG during MRI: A Review

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