In this paper, a novel decision based median (DBM) filter for enhancing MR images has been proposed. The method is based on eliminating impulse noise from MR images. A median-based method to remove impulse noise from digital MR images has been developed. Each pixel is leveled from black to white like gray-level. The method is adjusted in order to decide whether the median operation can be appli...

The work of Brittenham [1], Fischer [2], and others has shown that biomagnetic susceptibility measurements are a uniquely effective, noninvasive method to monitor liver iron in patients with iron overload diseases. However, existing instruments, based on superconducting quantum interference devices (SQUIDs), are too expensive for widespread clinical use. We are developing a prototype biomagneti...

As a key component of hydraulic control systems, hydraulic servovalves influence their performance significantly. Unpredictable self-excited noise inside hydraulic servovalves may cause instability and even failure. Being functional, with higher saturation magnetization and increased viscosity when exposed to a magnetic field, magnetic fluids (MFs) have been widely used in dampers, sealing, and...

Magnetic Resonance Imaging is the best technique used in medical fields for diagnosis of brain tumors at advanced stages. Removing noise from the original MRI is still a challenging problem for researchers. Various approaches are designed and followed for Denoising. A new signal-preserving technique for noise suppression in event-related magnetic resonance imaging (MRI) data is proposed based o...

Experimental investigations of current shot noise in quantum point contacts show a reduction of the noise near the 0.7 anomaly. It is demonstrated that such a reduction naturally arises in a model proposed recently to explain the characteristics of the 0.7 anomaly in quantum point contacts in terms of a quasibound state, due to the emergence of two conducting channels. We calculate the shot noi...

Low frequency noise has been measured in magnetic tunnel junctions with MgO barriers and magnetoresistance values up to 235%. The authors investigated the noise for different degrees of crystallization and CoFeB/MgO interface quality depending on the annealing temperature. The authors report an extremely low 1/ f noise, compared to magnetic junctions with Al2O3 barriers. The origin of the low f...

The low-frequency noise in epitaxial La0.7Sr0.3Mn1−x FexO3 thin films with x = 0, 0.08 and 0.12 has been studied as a function of magnetic field (up to 1500 G). At zero external magnetic field (B = 0 G), there is no appreciable peak in the normalized noise power spectral density (PSD) for x = 0 thin films; however, a peak does appear for x = 0.08 and 0.12 thin films near the metal– insulator tr...