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Advances in Echo Imaging Using Contrast Enhancement - download pdf or read online

By Pravin M. Shah (auth.), Navin C. Nanda MD, Reinhard Schlief (eds.)

ISBN-10: 9401581266

ISBN-13: 9789401581264

ISBN-10: 9401581282

ISBN-13: 9789401581288

` Nanda and Schlief have edited and produced an authoritative and updated reference publication for either skilled and green echocardiologists. I strongly suggest this e-book to these attracted to this box. '
International magazine of Cardiology, forty five (1994)

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Extra resources for Advances in Echo Imaging Using Contrast Enhancement

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1, the velocity of sound c was calculated to be 3 x 103 cm/s. Gibson [45] measured the effects of air bubbles on the speed of sound c in water and obtained a very good correlation with theory. Calling x (= [II + f) the volume fraction of air in the air-water mixture, and using the same subscripts as above, the mean density Pm is Pm = (1 - X)PI + XPg and mean compressibility Km in terms of liquid KI and gas Kg is: (22) Principles of echo contrast 29 i< w 0- '" ~ w w '"u. : o I ... 001 k. Ik ~ k.

Figure 8 illustrates, for air in water, the inverse relationship found between instantaneous-to-original bubble radius ratio and instantaneous-to-initial ambient pressure ratio. A linear correlation was obtained when data were plotted on a logarithmic scale. 4. Variations in pressure wave forms and durations did not Principles of echo contrast 27 2 I (a) \ 'd. R R, *" III . . 5 0 *_. tit . 10 • • * 15 20 PI P, .. 10' " R R, (b) ~, 10'" ... '''-..... · '" ' .. 10' • 10' 10" PIP. Figure 8. The response of air bubbles to changes in the ambient pressure plotted on both (a) linear; and (b) logarithmic scales.

The amount of gas needed to give a striking contrast effect was very small. 3. PHYSICAL INFLUENCES ON ULTRASONIC CONTRAST EFFECT Viscosity Koenig and Meltzer [16] studied the relative viscosity of four potential contrast agents: cold (S 0c) and room temperature 70% sorbitol, Renograffin76 and SO% dextrose. The microbubbles were generated by sonication of 6 cc of each solution and measured by light microscopy. Microbubble size in microns (mean ± SD) and the relative viscosity are summarized in Table 1.

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Advances in Echo Imaging Using Contrast Enhancement by Pravin M. Shah (auth.), Navin C. Nanda MD, Reinhard Schlief (eds.)

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