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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...
Women are at a twofold higher risk of developing major depressive disorder (MDD) than that of men. However, the investigation of female MDD patients functional brain activity is rare and the detailed mechanism remains unclear. The present work is to explore the altered spontaneous neural activity measured with regional homogeneity (ReHo) in female MDD patients using resting-state functional magnetic...
This paper reports the characterization of reactively sputtered iron oxide thin films for their application in a novel class of top-down engineered contrast agent particles for multispectral magnetic resonance imaging (MRI). Tunable saturation magnetic polarizations (JS) of iron oxide thin films ranging from approximately 0.05 to 0.2 emu/mg were achieved by adjusting sputtering parameters. The iron...
In this paper, we demonstrate a novel type of contrast agent with multiplexing capability for use in magnetic resonance imaging (MRI) applications. Keeping biocompatibility in mind, iron and several iron oxide thin films with varying magnetic properties were prepared and characterized using a superconducting quantum interference device (SQUID). Double-disk shaped particles constructed with iron and...
Arrays of double-disk structured particles were fabricated with ferromagnetic iron disks separated by nonmagnetic polyimide spacers, to be used as multispectral contrast agents for magnetic resonance imaging (MRI). The advantages of using this contrast agent, compared to currently existing agents, include geometrically dependent spectral signatures, diffusion driven signal amplification, and potentials...
We demonstrate structurally reconfigurable metamaterials with a marked tunability of both electric and magnetic responses at terahertz frequencies where artificial “atoms” reorient within unit cells in response to an external stimulus.
3D stand-up metamaterial with purely magnetic resonance at THz frequencies was demonstrated and characterized. The successful design, fabrication and characterization of 3D metamaterials provides a new pathway for implementing novel electromagnetic properties at terahertz frequencies.
This paper introduces a new local polynomial regression (LPR)-based high-resolution image reconstruction method for human brain magnetic resonance images. In LPR, the image pixels are modeled locally by a polynomial using least-squares (LS) criterion with a kernel having a certain bandwidth matrix. Steering kernels with local orientation are used in LPR to adapt better to local characteristics of...
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