Event Description
IEEE Philadelphia Chapter of AP/MTT-S Presents a Distinguished Microwave Lecturer Talk in Collaboration with the Department of Electrical and Computer Engineering and the Drexel IEEE Graduate Student Forum:
“RF Aspects of Magnetic Resonance Imaging”
Dr. Robert H. Caverly
Professor
of Electrical Engineering, Villanova University
3:00-4:00PM, Tuesday, May 30, 2017
Bossone 302, Drexel University
(Light
refreshments are to be provided 15 minutes before start of talk)
Abstract:
Magnetic Resonance
Imaging (MRI) scanners are an important diagnostic tool for the medical
practitioner. MRI provides a non-invasive means of obtaining high
contrast images of soft tissues and to obtain real-time images of the
cardiovascular system and other dynamic changes in the human body. MRI
scanners rely heavily on a number of topical areas of interest to Electrical
Engineers: image processing, high speed computing and RF (radio frequency)
systems and components. This presentation will focus on some of the RF
aspects of the MR process and MR scanners. A primer on the physical
phenomenon behind magnetic resonance will start the presentation and include a
discussion of the origin of the MR signal. The need for the high static
magnetic field (B0), the use of gradient coils for MR signal location, simple
RF pulse sequences and how they are used in image construction will be
covered. This MR image construction process and the control of the
various steps that manipulate the atomic nuclei to generate the final MR
diagnostic image put demanding constraints on RF equipment capabilities and
these will be discussed, along with a high-level overview of the various
components making up conventional MRI systems. This high-level overview
will include a look at various examples of transmit and receive RF systems and
examples of transmit and receive coils that make up MR scanners and system
diagrams for both the RF transmit and receive paths. The talk with then
narrow in scope to look at how these RF coils are modeled and controlled in
both transmit and receive states and how these components are used for
transmit/receive switching and patient and equipment protection.
Biography:
Dr. Robert H. Caverly received his
Ph.D. degree in electrical engineering from The Johns Hopkins University,
Baltimore, MD, in 1983. He has been a
faculty member at Villanova University in the Department of Electrical and
Computer Engineering since 1997 and is a Full Professor. Previously, he was a Professor for more than
14 years at the University of Massachusetts Dartmouth. Dr. Caverly's research interests are focused
on the characterization of semiconductor devices such as PIN diodes and FETs in
the microwave and RF control environment.
He has published more than 100 journal and conference papers and is the
author of two books, Microwave and RF Semiconductor Control Device Modeling
and CMOS RFIC Design Principles from Artech House. An IEEE Fellow, Dr. Caverly is an Associate
Editor of the IEEE Microwave Magazine.
His webpage is http://rcaverly.ece.villanova.edu/rcaverly/rcaverly.htm.
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