Tushar Kanti Bera

Bio: Tushar Kanti Bera is an academic researcher from National Institute of Technology, Durgapur. The author has contributed to research in topics: Electrical impedance tomography & Imaging phantom. The author has an hindex of 21, co-authored 68 publications receiving 1154 citations. Previous affiliations of Tushar Kanti Bera include Yonsei University & B.M.S. College of Engineering.

The effective admittivity of frequency for anisotropic biological tissue model

Abstract: The electrical properties, conductivity and permittivity, of biological tissue can be delineated by a complex tensor. The effective admittivity, depicted complex tensor, of biological tissue depends on several variables; proportions of intraand extracellular fluids, membrane structures, scale, and applied frequency. For characterizing tissue structural information which is relating to the biological cell suspensions, the frequency dependence of effective admittivity spectra of biological tissue can be used. Therefore, effective admittivity spectra is important for understanding tissue’s physiological conditions and structure. This work includes how we can determine the effective admittivity for a cube with some different relevant compositions. The definitions of effective admittivity may suggest the ways of measuring it from boundary current and voltage values. According to the homogenization theory, the effective admittivity can be computed from pointwise admittivity by Maxwell equations. The effective admittivity of simple models is computed as a function of frequency to obtain Maxwell-Wagner interface effects starting from mathematical formulations. Finally, layer potentials are used to obtain the Maxwell-Wagner-Fricke expression for a dilute suspension of ellipses and membrane-covered spheres.

A Low Cost Electrical Impedance Tomography (EIT) Instrumentation for Impedance Imaging of Practical Phantoms: A Laboratory Study

Abstract: A low cost Electrical Impedance Tomography (EIT) instrumentation is developed for studying the impedance imaging of practical phantoms. The EIT instrumentation is developed with a constant current injector, signal conditioner block and a DIP switch based multiplexer module. The constant current injector consists of a variable frequency Voltage Controlled Oscillator (VCO) and a modified Howland based Voltage Control Current Source (VCCS). The signal conditioner block is made up of an instrumentation amplifier (IAmp), a 50 Hz notch filter (NF) and a narrow band pass filter (NBPF) developed by cascading one lowpass filter and a highpass filter. The electrode switching module is developed using DIP switch based multiplexers to switch the electrodes sequentially for injecting current and measuring the boundary voltage data. Load response, frequency response and the Fast Fourier Transform (FFT) studies are conducted to evaluate the VCO, VCCS, IAmp, NF and NBPF performance. A number of practical phantoms are developed and the resistivity imaging is studied in EIDORS to evaluate the instrumentation. Result shows that the instrumentation is suitable for laboratory based practical phantom imaging studies.

Design and Development of a Low-Cost Magnetic Induction Spectroscopy (MIS) Instrumentation

Abstract: Design and development procedure of a low-cost Magnetic Induction Spectroscopy (MIS) instrumentation has been presented. Along with the mathematical model of the electromagnetic system, MIS instrumentation is developed with two windings of suitable turns using enamelled copper wires of required cross-sectional area. The variable voltage multifrequency function generator developed to generate the magnetic field lines is used to excite the primary coil. The voltage developed at the secondary winding due to the Faraday's electromagnetic induction principle is acquired to sense the permeability of the different materials placed as the core of the electromagnetic interface. The SNR has been studied for different amounts of voltages and frequencies of the electrical excitation applied at primary winding. The advantages and limitations of the system have been described along with the future work and possible applications of the system.

Studying the resistivity imaging of practical phantoms with common ground current injection technique in electrical impedance tomography

Abstract: Surface electrodes are essentially required to be switched by analogue multiplexers operating with a set of parallel digital data for boundary data collection in electrical impedance tomography EIT. A 16 electrode EIT system needs 16-bit parallel digital data to operate the multiplexers. More electrodes in an EIT system require more digital data bits. In this paper, a common ground current injection method is proposed for a 16 electrodes EIT system to switch the electrodes with reduced number of digital data. Common ground method needs only two 16:1 multiplexers operating with only 8-bit parallel digital data. Boundary data are collected from practical phantoms by injecting a constant current using common ground method. Resistivity images are reconstructed in EIDORS and the results are compared with the images obtained in opposite current pattern. Reconstructed images obtained with common ground method are found similar to the images obtained with the conventional opposite current pattern.

An Introduction To The Event Related Potential Technique

Abstract: Thank you for downloading an introduction to the event related potential technique. Maybe you have knowledge that, people have look hundreds times for their favorite readings like this an introduction to the event related potential technique, but end up in malicious downloads. Rather than reading a good book with a cup of tea in the afternoon, instead they are facing with some malicious bugs inside their laptop.

Introduction to the Finite Element Method

Abstract: This chapter introduces the finite element method (FEM) as a tool for solution of classical electromagnetic problems. Although we discuss the main points in the application of the finite element method to electromagnetic design, including formulation and implementation, those who seek deeper understanding of the finite element method should consult some of the works listed in the bibliography section.

Wearable sensors: modalities, challenges, and prospects

Abstract: Wearable sensors have recently seen a large increase in both research and commercialization. However, success in wearable sensors has been a mix of both progress and setbacks. Most of commercial progress has been in smart adaptation of existing mechanical, electrical and optical methods of measuring the body. This adaptation has involved innovations in how to miniaturize sensing technologies, how to make them conformal and flexible, and in the development of companion software that increases the value of the measured data. However, chemical sensing modalities have experienced greater challenges in commercial adoption, especially for non-invasive chemical sensors. There have also been significant challenges in making significant fundamental improvements to existing mechanical, electrical, and optical sensing modalities, especially in improving their specificity of detection. Many of these challenges can be understood by appreciating the body's surface (skin) as more of an information barrier than as an information source. With a deeper understanding of the fundamental challenges faced for wearable sensors and of the state-of-the-art for wearable sensor technology, the roadmap becomes clearer for creating the next generation of innovations and breakthroughs.

The Essential Physics Of Medical Imaging

Abstract: Thank you very much for reading the essential physics of medical imaging. As you may know, people have search hundreds times for their chosen novels like this the essential physics of medical imaging, but end up in harmful downloads. Rather than enjoying a good book with a cup of tea in the afternoon, instead they juggled with some infectious virus inside their laptop. the essential physics of medical imaging is available in our digital library an online access to it is set as public so you can get it instantly. Our digital library saves in multiple countries, allowing you to get the most less latency time to download any of our books like this one. Merely said, the the essential physics of medical imaging is universally compatible with any devices to read.