Method of using ultrasound energy to locate the occurrence of predetermined event in the heart cycle or other physiologic cycle of the body
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United States of America Patent
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May 8, 2001
Grant Date -
N/A
app pub date -
Aug 27, 1999
filing date -
Jun 24, 1998
priority date (Note) -
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Abstract
A scheme is provided for locating the time of occurrence of a predetermined event in a physiologic cycle associated with an anatomical object of a subject's body. Echoes produced from transmission of ultrasound energy into the anatomical object are processed by an image frame acquisition device to produce a series of image frames. Each image frame includes data representing an image of at least a portion of the anatomical object at a given time. Then, the difference is determined between the current image frame and at least one preceding image frame. A frame correlation coefficient is output based upon the difference. The time of occurrence is located at the instance of time when the frame correlation coefficient falls below a predetermined value, or when the rate of change of the frame correlation coefficient exceeds a predetermined value. The physiologic cycle may be the heart cycle and the predetermined event may be the QRS trigger of an electrocardiogram.
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