Download e-book for iPad: Contrast Media in Ultrasonography: Basic Principles and by Emilio Quaia

By Emilio Quaia

ISBN-10: 3540407405

ISBN-13: 9783540407409

Examines intimately different medical functions of microbubble-based distinction brokers. Explains the rules underlying using contrast-specific imaging concepts and the exam technique. comprises a variety of fine quality illustrations, together with many in colour. Written by means of well-known specialists.

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Additional resources for Contrast Media in Ultrasonography: Basic Principles and Clinical Applications (Medical Radiology Diagnostic Imaging)

Example text

This is also the principle requirement for determining the most important factors on which to concentrate for design. The development of a suitable model is the subject of the next section. 1 Derivation of a General Model A number of models describing the response of a single, coated gas microbubble to an imposed US field have been developed (Fox and Herzfeld 1954; Glazman 1983; Lord et al. 1990; de Jong et al. 1992; Church 1995; Khismatullin and Nadim 2002; Morgan et al. 1999). They vary in terms of their complexity but, regardless of the rigour with which they were originally derived, they can be shown to be mathematically equivalent.

E. having negligible thickness, than as solid shells. Considering firstly non-linear viscoelastic behaviour: it cannot be assumed in this case that the trace of the stress tensor T in Eq. 1 The Encapsulating Shell The conclusion from the preceding analysis was that the main determinant of response is the encapsulating shell. It is therefore important that its behaviour should be modelled correctly, not only to enable coated microbubble response to be accurately predicted, but also to indicate the most effective means of engineering the shell to achieve a particular response.

12a,b. Microbubble rupture shown in a tissue-simulating model. Microbubbles are suspended in a water bath containing a reference echoic object similar to tissues (Ob). At low acoustic power insonation (a) there is evidence of microbubble resonance with production of low intensity echoes (arrow). At high acoustic power insonation (b) there is evidence of microbubble destruction. The flash is produced by microbubble destruction (arrow) which produces a broadband frequency signal (Courtesy of Peter JA Frinking, Bracco Research, Geneva, Switzerland) with the peak negative acoustic pressure (P–) in megapascals (MPa; 1 Pa = 1 Newton/m 2), and the frequency in MHz.

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Contrast Media in Ultrasonography: Basic Principles and Clinical Applications (Medical Radiology Diagnostic Imaging) by Emilio Quaia


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