Methods and apparatus for non-uniform rotation distortion detect

Details Methods and apparatus for non-uniform rotation distortion detect Methods and apparatus for non-uniform rotation distortion detect

1997-11-25

1999-07-13

Jaworski, Francis J.

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

600462, 600466, A61B 800

Patent

active

059219343

ABSTRACT:
Methods and apparatus for non-uniform rotation distortion detection for enhanced intravascular ultrasound imaging. The present invention provides methods and apparatus which detect non-uniform rotation in an improved manner without using beacons which may create shadowing of tissue behind the beacons or other undesired artifacts in the image. In specific embodiments, the present invention may provide a particularly simple and useful solution for addressing the problem of non-uniform rotation distortion in intravascular ultrasound imaging in systems which use mechanical scanning. In specific embodiments, the present invention utilizes correlation of received signals in an image vector from reverberating ultrasound in a bubbly liquid-flushed catheter to determine non-uniform rotation of the transducer within the catheter. In other embodiments, the present invention utilizes correlation of imaging vectors within a blood speckle region given a particular beamwidth of ultrasound energy from a transducer to determine non-uniform rotation of the transducer.

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Maragos, Petros, "Morphological Correlation and Mean Absolute Error Criteria," IEEE, 1989, pp. 1568-1571.
Barnea, Daniel I. and Silverman, Harvey F., "A Class of Algorithms for Fast Digital Image Registration," IEEE Transactions on Computers, vol. C-21, No. 2, Feb. 1972, pp. 179-186.

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