 
|
|
|
ECE Colloquium 2007
Introduction to Digital Communication Systems
By
Abstract
We have seen an explosion of Internet use, cell phones, and navigation devices in our daily life. Advances in digital communication have made such technologies possible. In this talk, overall communication systems will be presented followed by modulation and coding methods.
Background of communication theory is not necessary to attend this talk. The talk will give a brief overview of digital communication systems including OFDM, spread spectrum, block codes, convolutional code, turbo codes, software defined radio (SDR), and GPS (Global Positioning System) to our graduate students who want to major in the areas of RF, Wireless, and Digital Communication systems. Simulation tools will be discussed and some results will be presented during the talk. Also, relevant EE courses will be discussed.
Basics of X-ray Computed Tomography
Abstract
X-ray computed tomography (CT) is an important tool of modern radiology. The transmission of x-rays through the body generates signals that reveal characteristics of the tissues within the body. Combining many signal paths, called rays, using a mathematical technique called tomographic reconstruction, we can create a three dimensional picture of the differing tissues within the body. A description of the CT imaging system, its evolution, and the process of tomographic reconstruction will be presented along with some clinical results.
An Introduction to Inverse Problems in the Context of Acoustic Inverse Scattering
By
Wireless Medical Applications: Challenges, Pitfalls, and Successes
By
The evolution of wireless communication has not left the field
of medicine untouched. The rising costs of medical expenditures has led to the
consideration of the incorporation of remote monitoring as a means of
circumventing the need for repeated CAT scan monitoring in the follow-up of
Abdominal Aortic Aneurysms. As an extension, the interruption of the repeated
emergency room visits by remotely monitoring and fine tuning the health of
patients in congestive heart failure is seen as a potential cost savings in what
is estimated to be $25 billion dollar expenditure. Thus with this trend, new
opportunities and challenges are being created for wireless medical
applications.
WiMAX – 101
By
Abstract
Wireless Service Providers (WISPs) have been striving for
wireless technologies that make wireless metro access possible. Access to areas
that are too remote, too difficult or too expensive to reach with traditional
wired infrastructures (such as fiber) require new technologies and a different
approach. For the first time, industry-wide support and innovation are driving
broadband wireless networking technologies. Network operators, service providers
and users benefit from a wide array of high-performance, feature-rich, and
cost-effective wireless products.
Wireless Fidelity (Wi-Fi)
revolutionized the market for unlicensed client-access radios in a wide variety
of applications. Starting in 2005, Worldwide Interoperability for Microwave
Access (WiMAX) certification of the IEEE 802.16-2004 standard for fixed-position
radios will do the same for point-to-point (P2P) and point-to-multi-point (P2MP)
wireless broadband equipment in both the licensed and unlicensed bands. In 2006,
the IEEE 802.16e standard for portable operation is expected to be ratified,
thus standardizing client radios in unlicensed and licensed bands.
MEMS manufacturing: A technology overview discussing equipment, processes, and applications
By
Abstract
Ultrasonic imaging resolution enhancement and speckle suppression by means of coded excitation and frequency compounding
By José Sánchez
A novel ultrasonic imaging coded excitation and pulse compression technique, Resolution Enhancement Compression (REC), is presented. The REC technique uses convolution equivalence to create a pre-enhanced chirp used, to excite the transducer, in order to increase the bandwidth of the ultrasonic imaging system. This enhanced bandwidth improves the axial resolution of the ultrasonic imaging system. Signal compression is achieved by mismatched filtering. In addition, a method for improving the contrast resolution of an ultrasonic B-mode image is proposed by combining the speckle reduction technique of frequency compounding (FC) with the REC technique. FC is known to suppress speckle in B-mode images by using filter banks. FC improves image quality and contrast resolution, but at the expense of axial resolution deterioration. Therefore, the improvements, in terms of axial resolution, obtained by using the REC technique are exploited to improve contrast resolution. Improvements in image quality will be quantified by three metrics: modulation transfer function (MTF), sidelobe-to-mainlobe ratio (SMR), and contrast-to-noise ratio (CNR). In simulations performed with Matlab®, a planar surface, spherical targets, and contrast targets were imaged by utilizing a single element transducer with a center frequency of 2.25 MHz. In experimental measurements, a single-element transducer (f/2) with a center frequency of 2.25 MHz was used to image a wire target, and gray scale hyperechoic and hypoechoic (±3-dB and ±6-dB) targets in an ATS 539 multipurpose tissue-mimicking phantom. Simulation and experimental results reveals that the axial resolution of the imaging system is improved by using the REC technique. Also, by combining REC with FC the CNR is improved by up to 60% without sacrificing axial resolution compared to conventional pulsing methods.
Applications in Medical Imaging
By
Abstract
The invention of x-ray imaging allowed noninvasive
visualization of the internal structures of the human body. Computerized
tomography (CT) brought another advance by allowing tissue properties at every
point in the body to be visualized, rather than the two-dimensional projection
provided by an x-ray. Magnetic
resonance imaging (MRI) has made it possible to measure a variety of magnetic
properties of the tissue at every point in the body.
Newer technologies such as positron emission tomography (PET) and single
photon emission computed tomography (SPECT) will provide even more information.
An important application couples the extraction of anatomical information with
computer graphics to enhance the user’s ability to interpret the data. Our work
in this area will be described.
A new area of research is to integrate a
haptic device with 3-D models generated from radiological data to provide a
simulation tool for surgical procedures.
A haptic tool having six degrees of freedom is combined with a
three-dimensional model generated from MRI data to simulate the arthroscopic
procedure used to treat patients with lesions in the articular cartilage.
The force feedback capability of the haptic device can be modified to
simulate the feel that a surgeon experiences while performing an arthroscopic
procedure.
Back to the ECE Microwave home page
Page Manager: Sairaj Anantoju
|
[Prospective Students]
[Current Students]
[Alumni]
[Faculty]
[Home] [Contact us] [Curriculum] [Senior Projects] [Research] [People] [Links] Copyright (c)1995-2013 Bradley University. All rights reserved. . . |