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Novel Electrode Placement in Electrical Bioimpedance-Based Stroke Detection: Effects on Current Penetration and Injury Characterization in a Finite Element Model
Conclusion: These findings support the use of novel electrode placements in EBI to overcome prior limitations, indicating a potential approach to increasing the technology's clinical utility in stroke identification. Significance: A non-invasive EBI monitor for stroke could provide essential timely intervention an- care of stroke patients.
Source: IEEE Transactions on Biomedical Engineering - April 22, 2022 Category: Biomedical Engineering Source Type: research

C2MA-Net: Cross-Modal Cross-Attention Network for Acute Ischemic Stroke Lesion Segmentation Based on CT Perfusion Scans
Conclusion: This study demonstrates advantages of applying C2MA-network to segment AIS lesions, which yields promising segmentation accuracy, and achieves semantic decoupling by processing different parameter modalities separately. Significance: Proving the potential of cross-modal interactions in attention to assist identifying new imaging biomarkers for more accurately predicting AIS prognosis in future studies.
Source: IEEE Transactions on Biomedical Engineering - December 24, 2021 Category: Biomedical Engineering Source Type: research

Adaptive Clustering Distorted Born Iterative Method for Microwave Brain Tomography With Stroke Detection and Classification
A modified distorted Born iterative method (DBIM), which includes clustering of reconstructed electrical properties (EPs) after certain iterations, is presented for brain imaging aiming at stroke detection and classification. For this approach to work, a rough estimation of number of different materials (or bio-tissues) in the imaged domain and their corresponding rough dielectric properties (permittivity and conductivity) are needed as a prior information. The proposed adaptive clustering DBIM (AC-DBIM) is compared with three conventional methods (DBIM, multiplicative regularized contrast source inversion (MR-CSI), and CS...
Source: IEEE Transactions on Biomedical Engineering - March 21, 2022 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

Dynamic Microwave Imaging of the Cardiovascular System Using Ultra-Wideband Radar-on-Chip Devices
Conclusion: Using radar chip technology and an imaging approach, cardiovascular activity was detected in the body, demonstrating first steps towards biomedical dynamic microwave imaging. The current portable and modular system design was found unsuitable for static in-body imaging. Significance: This first proof of concept demonstrates that radar-on-chip could enable cardiovascular imaging in a low-cost, small and portable system. Such a system co- ld make medical imaging more accessible, particularly in ambulatory or long-term monitoring settings.
Source: IEEE Transactions on Biomedical Engineering - September 1, 2022 Category: Biomedical Engineering Source Type: research