Pulse-injector for quantitative angiographic blood-flow measurements
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United States of America Patent
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Jan 23, 1996
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N/A
app pub date -
Nov 30, 1993
filing date -
Nov 30, 1992
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Abstract
A technique for pulsed-injection of radiographic contrast agent uses a pressurized source of contrast agent interrupted by a rotary valve at rates ranging from 1 to 30 Hz. This produces well-defined boli at the end of the catheter. The position of these boli is recorded by a digital radiographic system and analyzed to produce quantitative measurements of blood velocity and flow rate throughout the cardiac cycle.
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