By K. Kirk Shung

ISBN-10: 0824740963

ISBN-13: 9780824740962

Ultrasound imaging is likely one of the most vital and general diagnostic instruments in glossy medication, moment simply to the traditional x-ray. even though thought of a mature box, study maintains for making improvements to the services and discovering new makes use of for ultrasound know-how whereas riding down the price of more recent, extra complex methods similar to intravascular ultrasound. Diagnostic Ultrasound: Imaging and Blood stream Measurements offers new advancements, primary physics, instrumentation, process structure, organic results of ultrasound, and medical functions that replicate this initiative. preserving mathematical derivations to a minimal, this booklet starts with an outline of the sector, the strengths and weaknesses of the expertise, and its function relative to different imaging modalities. The e-book proceeds to explain the elemental physics concerned, an in depth exam of the transducer, traditional imaging techniques, and Doppler measurements. the next chapters discover new advancements corresponding to move, displacement, distinction, harmonic, intracavity, and 4-D imaging. the writer concludes through reviewing present prestige and criteria on bioeffects besides a distinct bankruptcy on measuring ultrasonic homes of tissues that may be stumbled on nowhere else. Emphasizing the engineering and sign processing facets of ultrasound expertise instead of taking a medical viewpoint, Diagnostic Ultrasound: Imaging and Blood circulate Measurements encourages and allows additional advances during this tested but dynamic box.

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Example text

Appropriate instrumentation is incorporated to extract the Doppler frequency, which is proportional to the red cell velocity. REFERENCES American Institute of Ultrasound in Medicine. Safety Considerations for Diagnostic Ultrasound. Laurel, MD: AIUM, 1984. Dunn, F. A. Definitions of terms and measurements of acoustical quantities. , Ed. Tissue Characterization with Ultrasound, Boca Raton, FL: CRC Press, 1986, 1–14. Y. K. Ultrasonic backscatter from mammalian tissues. J. Acoust. Soc. Am. 1985, 78:871–877.

The acoustic impedance of blood vessels, which are composed mainly of connective tissues, should be and was found to be higher than that of most other tissues (Geleskie and Shung, 1982). Because of their higher impedance than surrounding tissues, tissues that contain more connective tissues should be more echogenic that those that contain less. However, it must be noted that the attenuation of ultrasound in connective tissues is also much higher (Greenleaf, 1986). Very little energy can transmit through a mass such as a solid tumor composed of mainly connective tissues.

The nonlinear behavior of a fluid medium can be expressed by a second-order parameter B/A. 40) where T is temperature Cp is the heat capacity per unit mass at constant pressure βv is the volume coefficient of thermal expansion The first term represents change in sound speed per unit change in pressure at constant temperature and entropy. The second term represents the change in sound speed per unit change in temperature at constant pressure and entropy. Therefore, the B/A parameter can be estimated from these quantities, which are known or measurable.

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Diagnostic ultrasound: imaging and blood flow measurements by K. Kirk Shung

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