Robert H. Caverly (DML Term:
2014-2016)
View Bio
Professor
Villanova
University
800
Lancaster Ave
Villanova, Pa 19085
USA
Phone
1:
(610)519-5660
Email
1:
r.caverly@ieee.org
Presentation |
Abstract |
Files |
RF Aspects of Magnetic Resonance Imaging |
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Abstract: Magnetic Resonance Imaging (MRI)
scanners are an important diagnostic tool for the medical practitioner.
MRI provides a non-invasive means of imaging 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. |