Devices and Materials in MRI

Schaefers, Gregor; Melzer, Andreas

doi:10.1007/978-3-540-74658-4_26

Cited by 5 publications

(1 citation statement)

References 26 publications

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“…The strong magnetic environment of the scanner limits the use of the conventional electromagnetic equipments. In addition, the current-carrying conductors are particularly liable to produce image artifacts by distorting the magnetic field homogeneity, especially when they are in the close proximity of the magnet [12], [13]. 1 Among the available touch sensing approaches, optical touch sensing is more promising for implementation in MRI especially due to its inherent invulnerability to electromagnetic interference.…”

Section: Introductionmentioning

confidence: 99%

Design of an fMRI-compatible optical touch stripe based on frustrated total internal reflection

Jarrahi

Wanek

2014

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Previously we developed a low-cost, multi-configurable handheld response system, using a reflective-type intensity modulated fiber-optic sensor (FOS) to accurately gather participants' behavioral responses during functional magnetic resonance imaging (fMRI). Inspired by the popularity and omnipresence of the fingertip-based touch sensing user interface devices, in this paper we present the design of a prototype fMRI-compatible optical touch stripe (OTS) as an alternative configuration. The prototype device takes advantage of a proven frustrated total internal reflection (FTIR) technique. By using a custom-built wedge-shaped optically transparent acrylic prism as an optical waveguide, and a plano-concave lens to provide the required light beam profile, the position of a fingertip touching the surface of the wedge prism can be determined from the deflected light beams that become trapped within the prism by total internal reflection. To achieve maximum sensitivity, the optical design of the wedge prism and lens were optimized through a series of light beam simulations using WinLens 3D Basic software suite. Furthermore, OTS performance and MRI-compatibility were assessed on a 3.0 Tesla MRI scanner running echo planar imaging (EPI) sequences. The results show that the OTS can detect a touch signal at high spatial resolution (about 0.5 cm), and is well suited for use within the MRI environment with average time-variant signal-to-noise ratio (tSNR) loss < 3%.

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Section: Introductionmentioning

confidence: 99%

Design of an fMRI-compatible optical touch stripe based on frustrated total internal reflection

Jarrahi

Wanek

2014

2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society

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Systematic review of MRI safety literature in relation to radiofrequency thermal injury prevention

Baker,

Nugent,

Grainger

et al. 2024

J of Medical Radiation Sci

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IntroductionMagnetic resonance imaging (MRI) is a rapidly evolving modality, generally considered safe due to lack of ionising radiation. While MRI technology and techniques are improving, many of the safety concerns remain the same as when first established. Patient thermal injuries are the most frequently reported adverse event, accounting for 59% of MRI incidents to the Food and Drug Administration (FDA). Surveys indicate many incidents remain unreported. Patient thermal injuries are preventable and various methods for their mitigation have been published. However, recommendations can be variable, fragmented and confusing.The aim of this systematic review was to synthesise the evidence on MRI safety and associated skin injuries and offer comprehensive recommendations for radiographers to prevent skin thermal injuries.MethodsFour journal databases were searched for sources published January 2010–May 2023, presenting information on MRI safety and thermal injuries.ResultsOf 26,801 articles returned, after careful screening and based on the eligibility criteria, only 79 articles and an additional 19 grey literature sources were included (n = 98). Included studies were examined using thematic analysis to determine if holistic recommendations can be provided to assist in preventing skin burns. This resulted in three simplified recommendations: Remove any electrically conductive items Insulate the patient to prevent any conductive loops or contact with objects Communicate regularly ConclusionBy implementing the above recommendations, it is estimated that 97% of skin burns could be prevented. With thermal injuries continuing to impact MRI safety, strategies to prevent skin burns and heating are essential. Assessing individual risks, rather than blanket policies, will help prevent skin thermal injuries occurring, improving patient care.

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Occupational exposure to electromagnetic fields in magnetic resonance environment: an update on regulation, exposure assessment techniques, health risk evaluation, and surveillance

Hartwig

Virgili²,

Mattei³

et al. 2021

Med Biol Eng Comput

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Magnetic Resonance Imaging (MRI) is one of the most-used diagnostic imaging methods worldwide. There are ∼50,000 MRI scanners worldwide each of which involves a minimum of five workers from different disciplines who spend their working days around MRI scanners. This review analyses the state-of-art of literature about the several aspects of the occupational exposure to electromagnetic fields (EMF) in MRI: regulations, literature studies on biological effects, and health surveillance are addressed here in detail, along with a summary of the main approaches for exposure assessment. The original research papers published from 2013 to 2021 in international peer-reviewed journals, in the English language, are analysed, together with documents published by legislative bodies. The key points for each topic are identified and described together with useful tips for precise safeguarding of MRI operators, in terms of exposure assessment, studies on biological effects, and health surveillance.

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Devices and Materials in MRI

Cited by 5 publications

References 26 publications

Design of an fMRI-compatible optical touch stripe based on frustrated total internal reflection

Design of an fMRI-compatible optical touch stripe based on frustrated total internal reflection

Systematic review of MRI safety literature in relation to radiofrequency thermal injury prevention

Occupational exposure to electromagnetic fields in magnetic resonance environment: an update on regulation, exposure assessment techniques, health risk evaluation, and surveillance

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