Measuring and testing – Vibration – By mechanical waves
Patent
1979-11-09
1982-07-27
Ciarlante, Anthony V.
Measuring and testing
Vibration
By mechanical waves
73621, 73633, 128660, G01N 2904
Patent
active
043411207
ABSTRACT:
An improvement in an ultrasonic imaging system is disclosed, enabling determination of volume and/or shape of three-dimensional portions of bodily tissue or the like. The improvement is applicable to ultrasonic imaging systems of the type adapted for examining bodily tissue, especially those including sector scanning transducer means, such as electronically scanned phased arrays or mechanically scanned transducers; means for phasing the actuation of said transducers to steer the emitted sound beam in a plurality of radial directions in a fan-shaped sector; means for receiving the reflected energy from the plurality of radial directions in the sector; means for determining from the reflected energy the acoustical impedance variations within the bodily tissue examined along the radial directions and providing therefrom a reconstructed image of the fan-shaped planar cross-section of bodily tissue examined; and a transducer body for carrying said array of elements, said body having an axis aligned with the plane of said fan-shaped sector and approximately symmetrically dividing the included angle of said fan, the body being orientable with respect to the bodily tissue being examined to enable the fan-shaped sector to intersect and thereby effect imaging of a desired cross-section of said tissue. The improvement enables evaluation of the volume or shape of a three-dimensional portion of the tissue being examined, and comprises means for determining the rotational angle between a reference position and a plurality of selected examining positions of the transducer body, upon the transducer body being rotated from its reference to the selected examining positions while at least one point on the body axis remains substantially spatially fixed; and means for correlating the associated reconstructed images with the said determined angles, whereby to generate a plurality of cross-sectional images of said three-dimensional tissue portion being examined, wherein the imaged tissue cross-sections include at least one common point, thereby to enable evaluation of the volume or shape of the three-dimensional tissue portion of interest.
REFERENCES:
patent: Re30397 (1980-09-01), King
patent: 3727180 (1973-04-01), Lingel et al.
patent: 3817089 (1974-06-01), Eggleton et al.
patent: 3955561 (1976-05-01), Eggleton
patent: 4094073 (1978-06-01), Parra
patent: 4120291 (1978-10-01), Paton et al.
Ciarlante Anthony V.
Diasonics Cardio/Imaging, Inc.
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