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Prediction of Hemorrhagic Transformation Severity in Acute Stroke From Source Perfusion MRI
Conclusion: The key contribution of our framework formalize HT prediction as a machine learning problem. Specifically, the model learns to extract imaging markers of HT directly from source PWI images rather than from pre-established metrics. Significance: Predictions visualized in terms of spatial likelihood of HT in various territories of the brain were evaluated against follow-up gradient recalled echo and provide novel insights for neurointerventionalists prior to endovascular therapy.
Source: IEEE Transactions on Biomedical Engineering - August 21, 2018 Category: Biomedical Engineering Source Type: research

First In Vivo Potassium-39 $(^{bf 39}$K) MRI at 9.4 T Using Conventional Copper Radio Frequency Surface Coil Cooled to 77 K
Potassium-39 ($^{39}$K) magnetic resonance imaging (MRI) is a noninvasive technique which could potentially allow for detecting intracellular physiological variations in common human pathologies such as stroke and cancer. However, the low signal-to-noise ratio (SNR) achieved in $^{39}$K-MR images hampered data acquisition with sufficiently high spatial and temporal resolution in animal models so far. Full wave electromagnetic (EM) simulations were performed for a single-loop copper (Cu) radio frequency (RF) surface resonator with a diameter of 30 mm optimized for rat brain imaging at room temperature (RT) and at liq...
Source: IEEE Transactions on Biomedical Engineering - January 17, 2014 Category: Biomedical Engineering Source Type: research

First In Vivo Potassium-39 K) MRI at 9.4 T Using Conventional Copper Radio Frequency Surface Coil Cooled to 77 K
Potassium-39 ( 39K) magnetic resonance imaging (MRI) is a noninvasive technique which could potentially allow for detecting intracellular physiological variations in common human pathologies such as stroke and cancer. However, the low signal-to-noise ratio (SNR) achieved in 39K-MR images hampered data acquisition with sufficiently high spatial and temporal resolution in animal models so far. Full wave electromagnetic (EM) simulations were performed for a single-loop copper (Cu) radio frequency (RF) surface resonator with a diameter of 30 mm optimized for rat brain imaging at room temperature (RT) and at liquid nitrogen (LN...
Source: IEEE Transactions on Biomedical Engineering - February 1, 2014 Category: Biomedical Engineering Source Type: research

On the Opportunities and Challenges in Microwave Medical Sensing and Imaging
Widely used medical imaging systems in clinics currently rely on X-rays, magnetic resonance imaging, ultrasound, computed tomography, and positron emission tomography. The aforementioned technologies provide clinical data with a variety of resolution, implementation cost, and use complexity, where some of them rely on ionizing radiation. Microwave sensing and imaging (MSI) is an alternative method based on nonionizing electromagnetic (EM) signals operating over the frequency range covering hundreds of megahertz to tens of gigahertz. The advantages of using EM signals are low health risk, low cost implementation, low operat...
Source: IEEE Transactions on Biomedical Engineering - June 20, 2015 Category: Biomedical Engineering Source Type: research

Wireless Resonant Circuits Printed Using Aerosol Jet Deposition for MRI Catheter Tracking
We report temperature measurements and, finally, demonstrate feasibility in a preliminary in vivo experiment. We provide material properties and electromagnetic simulation performance analysis. This paper presents fully aerosol jet-deposited and functional wireless resonant markers on polymer catheters for use in 3T clinical scanners.
Source: IEEE Transactions on Biomedical Engineering - February 21, 2020 Category: Biomedical Engineering Source Type: research

One-Stop MR Neurovascular Vessel Wall Imaging With a 48-Channel Coil System at 3 T
Conclusion: A 48-channel coil system was developed and demonstrated superior performance for vessel wall imaging at the intracranial and cervical carotid arteries compared with a commercial 36-channel coil. Significance: The 48-channel coil system is potentially useful for clinical diagnostics, especially when attempting to diagnose ischemic stroke.
Source: IEEE Transactions on Biomedical Engineering - July 17, 2020 Category: Biomedical Engineering Source Type: research