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We demonstrate a flexibly controllable molding of electromagnetic waves by designing magnetic metamaterials and metasrufaces with an array of ferrite rods under a particularly arranged bias magnetic field. The manipulation is accomplished for both the spatially propagating waves and the surface waves confined at the interface. Nonreciprocal properties associated with the magnetic surface plasmon resonance...
This work presents a 180-nm CMOS bandpass ΣΔ Analog-to-Digital Converter (ADC) developed to fulfill the specifications of a fully-integrated receiver for Magnetic Resonance Imaging (MRI). CMOS integration of a multichannel digital receiver would increase the quality of the image without the need of using many coaxial cables to connect the RF coils (located close to the patient) with the digitizing...
During a human brain MRI acquisition the resulting image is formed out of 2D slices. The slices must then be aligned and reconstructed to provide a 3-dimensional (3D) visualization of the brain volume. We propose in this work, an integrated system for the register ion and 3D reconstruction of DICOM MRI images and lesions of the brain acquired from multiple sclerosis (MS) subjects at two different...
Statistical modeling of high dimensional, correlated, and complex imaging data obtained from various longitudinal neuroimaging studies has become an inevitable part of automatic disease diagnosing tasks. In this paper, we propose a parametric brain image modeling based on the statistical properties of non-subsampled shearlet transform (NSST) coefficients. The NSST detail coefficients of multimodal...
Magnetotactic bacteria have the potential to controllably reach stagnant fluids inside the human body and achieve targeted drug delivery. In this application, motion of the magnetotactic bacteria is influenced by the near-surface effects such as the background flows and surface interactions. Here, we provide a hydrodynamic model of bipolarly-flagellated magnetotactic bacteria (Magnetospirillum gryphiswaldense...
Major depressive disorder (MDD) is associated with excessive self-focus and a tendency to engage in self-reflection. Women are more inclined to form negative thoughts when facing problems such as social rejection. The neuroimaging studies addressing MDD females are still rare. The medial prefrontal cortex, a central node of anterior default mode network (DMN), plays an important role in the pathophysiology...
This paper concerns the optimization and comparison of six different axial-flux permanent magnet (AFPM) machine topologies for an in-wheel direct drive application. The objective of the optimization is to reach maximum power density, which is of essence for an in-wheel motor. The machine topologies are optimized using the 3D analytical charge model in combination with a thermal equivalent circuit...
Cavernous malformation or cavernoma is a kind of brain vessel abnormality that can cause serious symptoms such as seizures, intracerebral hemorrhage and various neurological deficits. It is one of the most common epileptogenic lesions that can be identified by physicians based on magnetic resonance imaging (MRI) of the brain. However, visual detection of cavernomas in a large set of brain MRI slices...
Magnetic resonance (MR) transverse relaxation time (T2) mapping has frequently been used to evaluate collagen content and its organization. In this study, T2 mapping, using novel three-dimensional-triple-echo-steady-state technique was performed in volunteers in-vivo at 7 Tesla under the static load applied by MR compatible compression device. We observed that load of 250 N applied for 12 minutes...
Hyperthermia, increasing tumor temperatures to 40-43°C, is a proven oncological treatment modality enhancing the effectiveness of radiotherapy and chemotherapy. Tumors are usually heated by single radiofrequency or microwave antennas, or arrays of antennas around the patient. Reliable hyperthermia treatment planning by simulation of power and temperature distributions in the patient, requires the...
Scanning lasers increase the quality of the laser microsurgery enabling fast tissue ablation with less thermal damage. However, the possibility to perform scanning laser microsurgery in confined workspaces is restricted by the large size of currently available actuators, which are typically located outside the patient and require direct line-of-sight to the microsurgical area. Here, a magnetic scanner...
It has been observed that patients with neurodegenerative diseases, such as Alzheimer, Parkinson and Huntington's disorders, accumulate metals in their nervous system. In this context several techniques have been exploited in order to measure brain iron levels in some neurodegenerative diseases, such as Positron Emission Tomography (PET), Magnetic Resonance Imaging (MRI) and measurement systems based...
Currently, sorafenib is the only systemic therapy capable to increase the overall survival of the patient affected by advanced hepatocellular carcinoma. Unfortunately, its side effects limit the therapeutic response. Superparamagnetic iron oxide nanoparticles (SPIONs) are very attractive for drug delivery as they can be targeted to specific sites in the body through the application of a magnetic field,...
Recently, yttrium iron garnet (YIG, Y3Fe5O12) has been proved to be an efficient material for magnonics and spintronics application after discovery of spin pumping [1], spin seebeck effect [2] and spin hall magnetoresistance [3] phenomena.
A magneto-optical (MO) spatial light modulator (SLM) with submicron pixel sizes that is driven by spin transfer switching (spin-SLM) has been proposed and developed for displaying 3D holographic movies with wide viewing zone [1].
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