J. Thomas Vaughan
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View article: Experimental Evaluation of Relationship Between Radiofrequency Heating Near Implanted Conductive Devices, Scanner-Reported B <sub>1+rms,</sub> and Transmit Power
Experimental Evaluation of Relationship Between Radiofrequency Heating Near Implanted Conductive Devices, Scanner-Reported B <sub>1+rms,</sub> and Transmit Power Open
Time-varying radiofrequency (RF) fields necessary to perform magnetic resonance imaging (MRI) may induce excessive heating near implanted conductive medical devices during MRI. The time and space-averaged root-mean-square effective magneti…
View article: A standalone and cost-effective MR-compatible computer numerical control machine for simultaneous, multi-parameter mapping
A standalone and cost-effective MR-compatible computer numerical control machine for simultaneous, multi-parameter mapping Open
Measuring parameters like magnetic field strength and temperature inside a magnet bore is of interest to characterize the system and use that information for downstream image quality improvement or to determine safety thresholds. Multiple …
View article: An experimental evaluation of the relationship between the induced radiofrequency heating near an implanted conductive medical device during MRI, scanner reported B1+rms, and scanner reported average transmit power
An experimental evaluation of the relationship between the induced radiofrequency heating near an implanted conductive medical device during MRI, scanner reported B1+rms, and scanner reported average transmit power Open
Background Time-varying radiofrequency (RF) fields necessary to perform magnetic resonance imaging (MRI) may induce excessive heating near implanted conductive medical devices during MRI. Both time and space-averaged root mean square of th…
View article: Absence of long-term structural and functional cardiac abnormalities on multimodality imaging in a multi-ethnic group of COVID-19 survivors from the early stage of the pandemic
Absence of long-term structural and functional cardiac abnormalities on multimodality imaging in a multi-ethnic group of COVID-19 survivors from the early stage of the pandemic Open
Aims Many patients with coronavirus disease-2019 (COVID-19), particularly from the pandemic’s early phase, have been reported to have evidence of cardiac injury such as cardiac symptoms, troponinaemia, or imaging or ECG abnormalities durin…
View article: Magnetic resonance fingerprinting based thermometry (MRFT): application to <i>ex vivo</i> imaging near DBS leads
Magnetic resonance fingerprinting based thermometry (MRFT): application to <i>ex vivo</i> imaging near DBS leads Open
The purpose of this study is to demonstrate the first work of T 1 -based magnetic resonance thermometry using magnetic resonance fingerprinting (dubbed MRFT). We compared temperature estimation of MRFT with proton resonance frequency shift…
View article: Standalone RF Self-Interference Cancellation System for In-Vivo Simultaneous Transmit and Receive (STAR) MRI
Standalone RF Self-Interference Cancellation System for In-Vivo Simultaneous Transmit and Receive (STAR) MRI Open
Demonstrated is a standalone RF self-interference canceller for simultaneous transmit and receive (STAR) magnetic resonance imaging (MRI) at 1.5T. Standalone STAR cancels the leakage signal directly coupled between transmit and receive RF …
View article: Accelerated MRI using intelligent protocolling and subject-specific denoising applied to Alzheimer's disease imaging
Accelerated MRI using intelligent protocolling and subject-specific denoising applied to Alzheimer's disease imaging Open
Magnetic Resonance Imaging (MR Imaging) is routinely employed in diagnosing Alzheimer's Disease (AD), which accounts for up to 60–80% of dementia cases. However, it is time-consuming, and protocol optimization to accelerate MR Imaging requ…
View article: Accelerated MRI using intelligent protocolling and subject-specific denoising applied to Alzheimer’s disease imaging
Accelerated MRI using intelligent protocolling and subject-specific denoising applied to Alzheimer’s disease imaging Open
Magnetic Resonance Imaging (MRI) is expensive and time-consuming. Protocol optimization to accelerate MRI requires local expertise since each MR sequence involves multiple configurable parameters that need optimization for contrast, acquis…
View article: Deep learning of MRI contrast enhancement for mapping cerebral blood volume from single-modal non-contrast scans of aging and Alzheimer's disease brains
Deep learning of MRI contrast enhancement for mapping cerebral blood volume from single-modal non-contrast scans of aging and Alzheimer's disease brains Open
While MRI contrast agents such as those based on Gadolinium are needed for high-resolution mapping of brain metabolism, these contrast agents require intravenous administration, and there are rising concerns over their safety and invasiven…
View article: Superconducting magnet designs and MRI accessibility: a review
Superconducting magnet designs and MRI accessibility: a review Open
Presently, Magnetic Resonance Imaging (MRI) magnets must deliver excellent magnetic field (B0) uniformity to achieve optimum image quality. Long magnets can satisfy the homogeneity requirements but require considerable superconducting mate…
View article: Open-source magnetic resonance imaging acquisition: Data and documentation for two validated pulse sequences
Open-source magnetic resonance imaging acquisition: Data and documentation for two validated pulse sequences Open
Raw data, simulated and acquired phantom images, and quantitative longitudinal and transverse relaxation times (T1/T2) maps from two open-source Magnetic Resonance Imaging (MRI) pulse sequences are presented in this d…
View article: Emerging ethical issues raised by highly portable MRI research in remote and resource-limited international settings
Emerging ethical issues raised by highly portable MRI research in remote and resource-limited international settings Open
View article: MRSaiFE: Tissue Heating Prediction for MRI: a Feasibility Study
MRSaiFE: Tissue Heating Prediction for MRI: a Feasibility Study Open
A to-date unsolved and highly limiting safety concern for Ultra High-Field (UHF) magnetic resonance imaging (MRI) is the deposition of radiofrequency (RF) power in the body, quantified by the specific absorption rate (SAR), leading to dang…
View article: Substituting Gadolinium in Brain MRI Using DeepContrast
Substituting Gadolinium in Brain MRI Using DeepContrast Open
Cerebral blood volume (CBV) is a hemodynamic correlate of oxygen metabolism and reflects brain activity and function. High-resolution CBV maps can be generated using the steady-state gadolinium-enhanced MRI technique. Such a technique requ…
View article: Virtual Scanner: MRI on a Browser
Virtual Scanner: MRI on a Browser Open
Virtual Scanner is an end-to-end hybrid Magnetic Resonance Imaging (MRI) simulator/console designed to be zero-footprint, modular, and supported by open-source standards. This paper outlines the software design and functionalities. The rep…
View article: Fast full‐wave calculation of electromagnetic fields based on weak‐form volume integral equation for MRI applications
Fast full‐wave calculation of electromagnetic fields based on weak‐form volume integral equation for MRI applications Open
High‐field magnetic resonance imaging (MRI) scans have safety problems because energy is not homogeneously distributed in the human body. A prescan where energy and temperature distributions are calculated for input energy budgeting can si…
View article: Investigating the physiological effects of 10.5 Tesla static field exposure on anesthetized swine
Investigating the physiological effects of 10.5 Tesla static field exposure on anesthetized swine Open
Purpose In this work, we investigated the relative effects of static magnetic field exposure (10.5 Tesla [T]) on two physiological parameters; blood pressure (BP) and heart rate (HR). Methods In vivo, we recorded both BP and HR in 4 swine …