DIAGNOSTIC
ULTRASOUND
Imaging and Blood
Flow Measurements
© 2006 by Taylor & Francis Group, LLC
A CRC title, part of the Taylor & Francis imprint, a member of the
Taylor & Francis Group, the academic division of T&F Informa plc.
DIAGNOSTIC
ULTRASOUND
Imaging and Blood
Flow Measurements
Boca Raton London New York
K. Kirk Shung
© 2006 by Taylor & Francis Group, LLC
Published in 2006 by
CRC Press
Taylor & Francis Group
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Boca Raton, FL 33487-2742
© 2006 by Taylor & Francis Group, LLC
CRC Press is an imprint of Taylor & Francis Group
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Printed in the United States of America on acid-free paper
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International Standard Book Number-10: 0-8247-4096-3 (Hardcover)
International Standard Book Number-13: 978-0-8247-4096-2 (Hardcover)
Library of Congress Card Number 2005048513
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Library of Congress Cataloging-in-Publication Data
Shung, K. Kirk.
Diagnostic Ultrasound : imaging and blood flow measurements / by K. Kirk Shung.
p. cm.
Includes bibliographical references and index.
ISBN 0-8247-4096-3
Diagnosis, Ultrasonic. 2. Blood flow – Measurement. 3. Laser Doppler blood flowmetry. I. Title.
RC78.7.U4S53 2005
616.07’543–dc22 2005048513
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DK1305_Discl.fm Page 1 Monday, July 11, 2005 1:33 PM
© 2006 by Taylor & Francis Group, LLC
This book is dedicated to my wife, Linda, and three children:
Albert, Simon, and May
DK1305_C000.fm Page v Friday, August 5, 2005 1:36 PM
© 2006 by Taylor & Francis Group, LLC
Preface
The field of medical imaging is advancing at a rapid pace. Imaging modalities like
x-ray radiography, x-ray computed tomography (CT), ultrasound, nuclear imaging,
magnetic resonance imaging (MRI), and optical imaging have been used in biology
and medicine to visualize anatomical structures as large as the lung and liver and
as small as molecules. Ultrasound is considered the most cost-effective among them.
It is used routinely in hospitals and clinics for diagnosing a variety of diseases. It
is the tool of choice in obstetrics and cardiology because it is safe and capable of
providing images in real time. New applications in small-animal imaging and cellular
imaging are being explored.
Although many clinical books on ultrasound have been published, very few
technical books are available. This has been a major problem for the author in
teaching graduate courses in ultrasonic imaging at the Department of Bioengineer-
ing, Pennsylvania State University, and Department of Biomedical Engineering,
University of Southern California, over the past 25 years. It is for this purpose that
this book was written. The book is intended as a textbook for a senior or first-year
graduate-level course in ultrasonic imaging in a biomedical engineering, electrical
engineering, medical physics, or radiological sciences curriculum. An attempt has
been made to minimize mathematical derivation and to place more emphasis on
physical concepts.
Chapter 1 gives an overview of the field of ultrasonic imaging and its role in
diagnostic medicine relative to other imaging modalities. Chapter 2 and Chapter 3
are relatively longer and describe the fundamental physics involved and a crucial
device in ultrasound, ultrasonic transducers. Conventional imaging approaches and
Doppler measurements are discussed in Chapter 4 and Chapter 5. More recent
developments, including contrast imaging and four-dimensional imaging, are
described in Chapter 6 through Chapter 9. In Chapter 10, current status and standards
on ultrasound bioeffects are reviewed. Chapter 11 discusses methods that have been
used to measure ultrasonic properties of tissues. This chapter is optional and may
be eliminated at the discretion of the instructor. A list of relevant references is found
at the end of each chapter and some of the chapters suggest further reading materials.
Material contained in the book should be more than sufficient for a one-semester
graduate senior-level course.
The book should also be of interest to radiologists with some technical back-
ground and practicing engineers and physicists working in the imaging industry.
K. Kirk Shung
DK1305_C000.fm Page vii Friday, August 5, 2005 1:36 PM
© 2006 by Taylor & Francis Group, LLC
Acknowledgment
The author gratefully acknowledges the financial support provided by NIH Grant
No. P41-EB2182 during the period when this book was written.
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© 2006 by Taylor & Francis Group, LLC
The Author
K. Kirk Shung,
Ph. D.,
obtained a B.S. in electrical engineering from Cheng-Kung
University in Taiwan in 1968, an M.S. in electrical engineering from the University
of Missouri, Columbia, in 1970, and a Ph.D. in electrical engineering from the
University of Washington, Seattle, in 1975. He did postdoctoral research at Provi-
dence Medical Center in Seattle, Washington, for 1 year before being appointed a
research bioengineer holding a joint appointment in the Institute of Applied Physi-
ology and Medicine. He became an assistant professor in the bioengineering pro-
gram, Pennsylvania State University, University Park in 1979 and was promoted to
professor in 1989. He was a Distinguished Professor of Bioengineering at Penn State
until September 1, 2002, when he joined the department of biomedical engineering,
University of Southern California, Los Angeles, as a professor. He has been the
director of NIH Resource on Medical Ultrasonic Transducer Technology since 1997.
Dr. Shung is a fellow of the IEEE, the Acoustical Society of America, and the
American Institute of Ultrasound in Medicine. He is a founding fellow of the
American Institute of Medical and Biological Engineering. He served two terms as
a member of the NIH Diagnostic Radiology Study Section. He received the IEEE
Engineering in Medicine and Biology Society Early Career Award in 1985 and
coauthored a best paper published in
IEEE Transactions
on Ultrasonics, Ferroelec-
trices, and Frequency Control in 2000. He was the distinguished lecturer for the
IEEE UFFC Society from 2002 through 2003 and was elected an outstanding
alumnus of Cheng-Kung University in Taiwan in 2001.
Dr. Shung has published more than 200 papers and book chapters. He is the
author of a textbook,
Principles of Medical Imaging
, published by Academic Press
in 1992, and coedited a book,
Ultrasonic Scattering by Biological Tissues
, published
by CRC Press in 1993. Dr. Shung’s research interests are ultrasonic transducers,
high-frequency ultrasonic imaging, and ultrasonic scattering in tissues.
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© 2006 by Taylor & Francis Group, LLC
Contents
Chapter 1
Introduction ..........................................................................................1
1.1 History..............................................................................................................1
1.2 Role of Ultrasound in Medical Imaging .........................................................2
1.3 Purpose of the Book ........................................................................................3
Reference ...................................................................................................................3
Further Reading .........................................................................................................3
Chapter 2
Fundamentals of Acoustic Propagation ...............................................5
2.1 Stress and Strain Relationships .......................................................................8
2.2 Acoustic Wave Equation ................................................................................11
2.2.1 Compressional Wave..........................................................................11
2.2.2 Shear Wave.........................................................................................12
2.3 Characteristic Impedance...............................................................................13
2.4 Intensity ..........................................................................................................14
2.5 Radiation Force ..............................................................................................17
2.6 Reflection and Refraction ..............................................................................17
2.7 Attenuation, Absorption, and Scattering .......................................................20
2.7.1 Attenuation .........................................................................................21
2.7.2 Absorption..........................................................................................21
2.7.3 Scattering............................................................................................25
2.8 Nonlinearity Parameter B/A ..........................................................................32
2.9 Doppler Effect ................................................................................................35
References................................................................................................................36
Chapter 3
Ultrasonic Transducers and Arrays....................................................39
3.1 Piezoelectric Effect ........................................................................................39
3.2 Piezoelectric Constitutive Equation...............................................................41
3.3 Ultrasonic Transducers...................................................................................46
3.4 Mechanical Matching.....................................................................................53
3.5 Electrical Matching ........................................................................................55
3.6 Transducer Beam Characteristics ..................................................................55
3.6.1 Beam Profiles .....................................................................................57
3.6.2 Pulsed Ultrasonic Field......................................................................61
3.6.3 Visualization and Mapping of the Ultrasonic Field ..........................62
3.6.4 Axial and Lateral Resolution.............................................................63
3.6.5 Focusing .............................................................................................63
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© 2006 by Taylor & Francis Group, LLC
3.7 Arrays .............................................................................................................68
References................................................................................................................77
Chapter 4
Gray-Scale Ultrasonic Imaging .........................................................79
4.1 A (Amplitude)-Mode and B (Brightness)-Mode Imaging ............................79
4.1.1 Resolution of B-Mode Ultrasonic Imaging Systems ........................88
4.1.2 Beam Forming....................................................................................88
4.1.3 Speckle ...............................................................................................90
4.1.4 Image Quality.....................................................................................91
4.1.4.1 Point Spread Function ........................................................92
4.1.4.2 Contrast ...............................................................................92
4.1.4.3 Noises..................................................................................94
4.1.5 Phase Aberration Compensation........................................................94
4.1.6 Clinical Applications..........................................................................94
4.2 M-Mode and C-Mode ....................................................................................95
4.3 Ultrasound Computed Tomography (CT)......................................................97
4.4 Coded Excitation Imaging .............................................................................98
4.5 Compound Imaging........................................................................................99
4.6 Synthetic Aperture Imaging ...........................................................................99
References..............................................................................................................101
Chapter 5
Doppler Flow Measurements...........................................................103
5.1 Nondirectional CW Flow Meters ................................................................103
5.2 Directional Doppler Flow Meters................................................................108
5.2.1 Single Sideband Filtering.................................................................108
5.2.2 Heterodyne Demodulation ...............................................................109
5.2.3 Quadrature Phase Demodulation .....................................................110
5.3 Pulsed Doppler Flow Meters .......................................................................113
5.4 Clinical Applications and Doppler Indices..................................................115
5.5 Potential Problems in Doppler Measurements ............................................115
5.6 Tissue Doppler and Multigate Doppler .......................................................116
References..............................................................................................................117
Chapter 6
Flow and Displacement Imaging.....................................................119
6.1 Color Doppler Flow Imaging ......................................................................119
6.2 Color Doppler Power Imaging ....................................................................125
6.3 Time-Domain Flow Estimation ...................................................................127
6.4 Elasticity Imaging ........................................................................................129
6.4.1 Elastography.....................................................................................130
6.4.2 Sonoelasticity Imaging.....................................................................131
6.5 B-Flow Imaging ...........................................................................................131
References..............................................................................................................133
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© 2006 by Taylor & Francis Group, LLC
Chapter 7
Contrast Media and Harmonic Imaging ..........................................135
7.1 Contrast Agents ............................................................................................135
7.1.1 Gaseous Agents ................................................................................135
7.1.2 Encapsulated Gaseous Agents .........................................................139
7.1.3 Dilute Distribution of Bubbles of Varying Size ..............................140
7.2 Nonlinear Interactions between Ultrasound and Bubbles...........................141
7.3 Modified Rayleigh–Plesset Equation for Encapsulated
Gas Bubbles .................................................................................................142
7.4 Solutions to Rayleigh–Plesset Equation ......................................................142
7.5 Harmonic Imaging .......................................................................................146
7.6 Native Tissue Harmonic Imaging ................................................................148
7.7 Clinical Applications of Contrast Agents and Harmonic Imaging .............149
References..............................................................................................................150
Chapter
8
Intracavity and High-Frequency (HF) Imaging...............................153
8.1 Imaging.........................................................................................................153
8.1.1 Transesophageal Cardiac Imaging...................................................153
8.1.2 Transrectal and Transvaginal Imaging.............................................155
8.1.3 Endoluminal Imaging.......................................................................156
8.2 Intravascular Imaging...................................................................................157
8.3 High-Frequency Imaging .............................................................................158
8.4 Acoustic Microscopes ..................................................................................162
References..............................................................................................................162
Chapter 9
Multidimensional Imaging...............................................................163
9.1 Parallel Processing .......................................................................................163
9.2 Multidimensional Arrays..............................................................................164
9.2.1 Two-Dimensional Arrays .................................................................166
9.2.2 Sparse Arrays ...................................................................................170
9.3 Three-Dimensional Imaging ........................................................................173
References..............................................................................................................175
Chapter 10
Biological Effects of Ultrasound .....................................................177
10.1 Acoustic Phenomena at High-Intensity Levels ...........................................177
10.1.1 Wave Distortion...............................................................................177
10.1.2 Heating ............................................................................................177
10.1.3 Cavitation ...................................................................................
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