Electric field measurements and computational modeling at ultrahigh-field MRI

Kangarlu, Alayar; Tang, Lin; Ibrahim, Tamer S.

doi:10.1016/j.mri.2007.01.115

Cited by 10 publications

(11 citation statements)

References 31 publications

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“…The gradient field is used for the spatial encoding of the MRI signal and can cause peripheral nerve stimulation, implant heating, and is responsible for the noise in MRI suites that can reach levels of 100 dB or more and potentially cause hearing damage. [19][20][21]28,30,33,39,47,[61][62][63][64][65][66][67]…”

Section: Magnetic Fields In Mrimentioning

confidence: 99%

Implementation of a comprehensive MR safety course for medical students

Sammet

2015

Magnetic Resonance Imaging

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This article proposes the design of an educational MR safety module using an available comprehensive multiple-choice exam for instructing medical students about basic MR and patient related safety. The MR safety course material can be implemented as a traditional didactic or interactive lecture in combination with hands-on safety demonstrations. The goal of the course is to ensure that medical students receive a basic understanding of MR principles and safety considerations. This course should prepare medical students for consideration of patient screening and safety when ordering MR studies. A multiple-choice exam can be used to document the proficiency in MR safety of the medical students. The course can be used by various medical school programs and may help to ensure consistent quality of teaching materials and MR safety standards.

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Section: Magnetic Fields In Mrimentioning

confidence: 99%

Implementation of a comprehensive MR safety course for medical students

Sammet

2015

Magnetic Resonance Imaging

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“…The fast switching gradient fields are applied for spatial encoding of the MRI signal and can cause peripheral nerve stimulation and implant heating. They are also responsible for the noise in the MRI scanner room, which can reach levels of 100 dB or more and potentially lead to hearing damages [74,119–121,118,122–126,30,31,127,128,16,90,129,37,130–133,57,58,134,135,69]. …”

Section: Magnetic Fields In An Mri Suitementioning

confidence: 99%

Magnetic resonance safety

Sammet

2016

Abdom Radiol

141

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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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“…However, the direct measurement of SAR using the E‐field presents the advantage of providing a fast response with great sensitivity; thus, it could be considered as complementary to heating measurements. The detection and measurement of the RF E‐field has been investigated previously based on several different methods . Taylor et al designed dipole‐based probes to measure the transverse E‐field inside a biological phantom near a rectangular RF coil.…”

Section: Introductionmentioning

confidence: 99%

“…The detection and measurement of the RF E-field has been investigated previously based on several different methods. [13][14][15][16][17][18] Taylor et al 13 designed dipole-based probes to measure the transverse E-field inside a biological phantom near a rectangular RF coil. The E-field value was determined using a self-made calibration system.…”

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confidence: 99%

Electro‐optic probe for real‐time assessments of RF electric field produced in an MRI scanner: Feasibility tests at 3 and 4.7 T

et al. 2017

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During magnetic resonance imaging (MRI) examinations, the average specific absorption rate (SAR) of the whole body is calculated as an index of global energy deposition in biological tissue without taking into account the presence of metallic implants or conductive materials. However, this global SAR calculation is not sufficient to ensure patient safety and a local SAR measurement should be carried out. Several measurement techniques have already been used to evaluate the local SAR, in particular electric field (E-field) probes, but the accuracy of the measurements and the resolutions (spatial and temporal) depend strongly on the measurement method/probe. This work presents an MR-compatible, subcentimeter probe based on an electro-optic (EO) principle enabling a real-time measurement of the local E-field during MRI scans. The experiments using these probes were performed on two different MR systems (preclinical and clinical) having different static magnetic field strengths and with different volume coil geometries. The E-field was measured with unloaded (in air) and loaded volume coils in order to assess the sensing characteristics of the optical probe. The results show an excellent linearity between the measured E-field and the radiofrequency (RF) magnetic field in both experimental conditions. Moreover, the distribution of the E-field throughout the volume coil was experimentally determined and was in good agreement with numerical simulations. Finally, we demonstrate through our measurements that the E-field depends strongly on the dielectric properties of the medium.

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Electric field measurements and computational modeling at ultrahigh-field MRI

Cited by 10 publications

References 31 publications

Implementation of a comprehensive MR safety course for medical students

Implementation of a comprehensive MR safety course for medical students

Magnetic resonance safety

Electro‐optic probe for real‐time assessments of RF electric field produced in an MRI scanner: Feasibility tests at 3 and 4.7 T

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