This volume contains a Prologue (keynote address), 39 papers, four section-discussions, and a general conference-review-summary. The papers concern instrumentation, processing, and display technologies for research an...
详细信息
This volume contains a Prologue (keynote address), 39 papers, four section-discussions, and a general conference-review-summary. The papers concern instrumentation, processing, and display technologies for research and diagnostic applications in cardiology. The technologies include ultrasonic imaging, ultrasonic doppler flowmeters, X-ray angiography, and scintigraphy. A final section considers the commercial viability of a specific prototype echocardioscope from the points of view of the venture capitalist, the manufacturer, and the user. Thirty-two selected papers are indexed separately.
This volume contains a Prologue (keynote address), 39 papers, four section-discussions, and a general conference-review-summary. The papers concern instrumentation, processing, and display technologies for research an...
详细信息
This volume contains a Prologue (keynote address), 39 papers, four section-discussions, and a general conference-review-summary. The papers concern instrumentation, processing, and display technologies for research and diagnostic applications in cardiology. The technologies include ultrasonic imaging, ultrasonic doppler flowmeters, X-ray angiography, and scintigraphy. A final section considers the commercial viability of a specific prototype echocardioscope from the points of view of the venture capitalist, the manufacturer, and the user. Thirty-two selected papers are indexed separately.
The proceedings contain 38 papers. The topics discussed include: developmental highlights and present applications of cardiac ultrasound;the technology of miniature acoustic element arrays;ultrasonic imaging using two...
The proceedings contain 38 papers. The topics discussed include: developmental highlights and present applications of cardiac ultrasound;the technology of miniature acoustic element arrays;ultrasonic imaging using two-dimensional transducer arrays;sector-scanning echocardiography;potential of real-time orthographic ultrasonic imaging for cardiovascular diagnosis;computer processing of echocardiographic images;dynamic cardiac imaging using a phased-array transducer system;Doppler instrumentation for measuring blood velocity and flow;and applications of Doppler ultrasound in clinical vascular disease.
Standard one-dimensional, time-motion echocardiography has been extraordinarily useful in the assessment of certain cardiac disorders. This ultrasound technique, unfortunately, is unable to supply detailed information...
详细信息
Standard one-dimensional, time-motion echocardiography has been extraordinarily useful in the assessment of certain cardiac disorders. This ultrasound technique, unfortunately, is unable to supply detailed information concerning cardiac spatial geometry. As a result, several two-dimensional ultrasound imaging systems have been developed for cardiac use over recent years.
In 1973 a real-time ultrasonic imaging system, developed at the Stanford Research Institute (SRI), was reported (1). Since that time this laboratory instrument has been improved and modified, and a second instrument, ...
详细信息
In 1973 a real-time ultrasonic imaging system, developed at the Stanford Research Institute (SRI), was reported (1). Since that time this laboratory instrument has been improved and modified, and a second instrument, designed expressly for clinical use, has been constructed. The results of preclinical experiments and of the first clinical applications with these ultrasonic cameras have been reported (2-5).
The goals of the various processing and display techniques are to derive from the Doppler spectrum a meaningful measure of the flow phenomenon being investigated and to present this measure to the operator. Important ...
详细信息
The goals of the various processing and display techniques are to derive from the Doppler spectrum a meaningful measure of the flow phenomenon being investigated and to present this measure to the operator. Important measures go beyond indication of velocity of flow or volume flow to include indications of the type of flow, i.e., laminar or turbulent, as well as geometric parameters such as the depth, width or cross-sectional area of the flow stream.
The first and second generation computer assisted cross-sectional reconstruction systems, such as the EMI, ACTA and DELTA brain and whole-body scanners, because of their excellent density resolution have produced accu...
详细信息
The first and second generation computer assisted cross-sectional reconstruction systems, such as the EMI, ACTA and DELTA brain and whole-body scanners, because of their excellent density resolution have produced accurate cross-sectional reconstructions of the anatomical structure of stationary organs, particularly the brain, the latter of which have revolutionized clinical neuroradiology (1-4).
A computer imageprocessing technique has been developed to estimate the degree of athero sclerosis in the human femoral artery. With an angiographic film of the vessel as input, the computer has been programmed to es...
详细信息
A computer imageprocessing technique has been developed to estimate the degree of athero sclerosis in the human femoral artery. With an angiographic film of the vessel as input, the computer has been programmed to estimate vessel abnormality through a series of measurements, some derived primarily from the vessel edge in formation and others from optical density vari ations within the lumen shadow. These measurements are combined into an atherosclerosis index, which as described below was found in a post-mortem study to correlate well with both visual and chemical estimates of atheroscle rotic disease.
Considerable effort has been devoted in recent years towards developing indices of myocardial performance based on the contractile geometry of the left ventricle. Beginning with the pioneer work of A.V. Hill (1), the ...
详细信息
Considerable effort has been devoted in recent years towards developing indices of myocardial performance based on the contractile geometry of the left ventricle. Beginning with the pioneer work of A.V. Hill (1), the force-velocity-length characteristics of isolated skeletal and cardiac muscle have been studied extensively (2-4). Application of this knowledge to the evaluation of the intact heart presents many problems. Angiographic measurements are subject to a variety of technical errors. In addition, there exists no exact model relating performance of the intact heart to the behavior of individual muscle fibers. The geometry of the ventricle is complex and difficult to account for accurately. Despite these difficulties, angiographic estimates of contractility are useful in evaluating myocardial performance.
暂无评论