Method and system for 3-D acoustic microscopy using short pulse

Details Method and system for 3-D acoustic microscopy using short pulse Method and system for 3-D acoustic microscopy using short pulse

1996-04-19

1997-04-01

Manuel, George

Surgery

Truss

Pad

12866002, A61B 800

Patent

active

056156758

ABSTRACT:
A method and system are provided for 3-D acoustic microscopy using short pulse laser excitation. A 3-D acoustic microscope for use in such a system is also provided. In a first embodiment, wherein optical detection is utilized, a focused excitation beam is scanned by a first acoustooptic scanning device across an absorbing layer of an opto-acoustic transducer (if needed) coupled to an object under investigation to create spherical ultrasonic waves within the object which may be living tissue. The reflected spherical ultrasonic waves are detected through the use of an unfocused probe beam and an optical detector array or a focused probe beam and a single photodetector which receive the probe beam from a reflecting surface of the opto-acoustic transducer. A second acoustooptic scanning device scans the probe beam at a plurality of positions on the reflecting surface of the opto-acoustic transducer. In another embodiment, an ultrasound transducer is utilized to acoustically detect the reflected spherical ultrasonic waves. Signals from the optical detector array, the photodetector, or the ultrasound transducer are subsequently digitized and reconstructed via 3-D synthetic aperture beam-forming equations to generate a 3-D representation of the object. Then the 3-D representation of the image is displayed as an image. The microscope includes the first and second acoustooptic scanning devices and the opto-acoustic transducer housed in a housing to define a needle probe such as a conventional biopsy needle.

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