CHAPTER 1 - Basic physics of medical ultrasound
ثبت نشده
چکیده
In this chapter the physics of medical ultrasound will be discussed at an introductory level for users of the technology. Several texts exist which readers can consult to deepen their understanding. Discussed later in this chapter are parameters related to ultrasound in tissue such as speed of ultrasound, attenuation and acoustic impedance. Values of these parameters for commonly encountered tissues and materials are quoted (for more values see Duck and Hill et al.). The clinical user is not required to have a detailed knowledge of these values but some knowledge helps in the production and interpretation of ultrasound images and Doppler blood flow measurements. Basic physics is also of central importance in considerations of safety.
منابع مشابه
An overview of therapeutic applications of ultrasound based on synergetic effects with gold nanoparticles and laser excitation
Acoustic cavitation which occurs at high intensities of ultrasound waves can be fatal for tumor cells. The existence of dissolved gases and also the presence of nanoparticles (NPs) in a liquid, irradiated by ultrasound, decrease the acoustic cavitation onset threshold and the resulting bubbles collapse. On the other hand, due to unique capabilities and optical properties of gold nanoparticles (...
متن کاملDiagnostic Ultrasound. an Introduction to the Interactions Between Ultrasound and Biological Issues
The title of this book is misleading since the subject matter is not diagnostic ultrasound as a clinical entity but rather the basic biological effects of ultrasound, and possible hazards involved in the diagnostic use of this modality. Within this limitation, it is an extremely useful volume which will find wide application as a basic but small reference work for clinical ultrasound. A chapter...
متن کاملPerinatal Addiction
The title of this book is misleading since the subject matter is not diagnostic ultrasound as a clinical entity but rather the basic biological effects of ultrasound, and possible hazards involved in the diagnostic use of this modality. Within this limitation, it is an extremely useful volume which will find wide application as a basic but small reference work for clinical ultrasound. A chapter...
متن کاملFocused—Basic Ultrasound Principles and Artifacts
turn on the machine. Apply coupling gel. Start scanning. In the realm of the busy veterinary general practice, emergency clinic, or intensive care unit, that statement really sums up the basic use of ultrasound. Just as natural as it is for us to take the stethoscope from around our neck and place it on a patient’s thorax, so should be picking up the ultrasound probe and placing it on the patie...
متن کاملIntroduction to the Physics of Ultrasound
From an acoustical point of view, bone is a complex medium as it is heterogeneous, anisotropic and viscoelastic. This chapter reviews the basic notions of physical acoustics which are necessary to tackle the problem of the ultrasonic propagation in bone, in the perspective of the application of quantitative ultrasound (QUS) techniques to bone characterization. The first section introduces the b...
متن کامل