Digital Techniques in Echocardiography by Steven B. Feinstein (auth.), J. Roelandt (eds.) PDF

By Steven B. Feinstein (auth.), J. Roelandt (eds.)

ISBN-10: 940093307X

ISBN-13: 9789400933071

ISBN-10: 9401079854

ISBN-13: 9789401079853

` .. we suggest this booklet as a important addition to the library of someone who has a specific curiosity in twodimensional echocardiography. '
American of magazine of Roentgenology, 1988

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Extra resources for Digital Techniques in Echocardiography

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Buda Al, Delp EJ, Meyer CR, lenkins 1M, Smith DN, Bookstein FL, Pitt B: Automatic computer processing of digital 2-dimensional echocardiograms. Am 1 Cardiol1983; 52: 384-9. 32. M3Iser lK, Riederer Sl, Enzmann DR, Brody WR: Some useful concepts of matched filtering III intravenous digital subtraction angiography. Invest Radio11984; 19: 424-37. 33. Yoshida S, Akizuki S, Gowski D, Downey 1M: Discrepancy between microsphere and diffusible tracer estimates of perfusion to ischemic myocardium. Amer J Physiol 1985; 249 (Heart eire PhysioI18): H255-H264.

Inject a known amount of contrast agent. The volume of dilution must be known for the injection route chosen. Collect image data as the contrast flows in and then washes out of the organ. For cardiac exams, ECG gating to select end-diastolic and/or end-systolic data is likely to be necessary. Display some simple indicator of study quality such as the ratio of signal change with contrast to baseline variation (beat to beat). Depending on the result, further injections can be tried, or the exam may be considered complete.

While several parameters of this typical time/intensity curve deserve attention, the focus has centered upon the decay slope of the graph. This decay slope if fit to a monoexponential function, the corresponding decay half time (TI/l ) is presumed to indicate the degree of myocardial perfusion; a prolonged TI/2 time indicating slow flow and washout, a short TI/2 indicating fast myocardial blood flow. Several studies have confirmed the usefulness of the monoexponential fit of intensity decay in correlating blood flow in the heart as well as kidney as determined by epicardial flow meters [14--19].

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Digital Techniques in Echocardiography by Steven B. Feinstein (auth.), J. Roelandt (eds.)

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