Radiation-induced thermoacoustic imaging

Details Radiation-induced thermoacoustic imaging Radiation-induced thermoacoustic imaging

1981-04-24

1983-05-31

Apley, Richard J.

Surgery

Truss

Pad

73643, 128659, 128660, 128736, G01K 100

Patent

active

043856349

ABSTRACT:
The acoustic wave generated by sudden thermal stress is used to obtain information non-invasively on the composition and structure of the stressed body. One or more acoustic transducers (1 and 1') are coupled with the surface of the body to intercept the acoustic wave and generate a corresponding electrical signal. The sudden thermal stress is induced by a pulse of radiation which deposits energy causing a rapid, but very small, rise of temperature. The radiation may be ionizing radiation, such as high energy electrons, photons (X-rays), neutrons, or other charged particles. The radiation may also be non-ionizing radiation, such as RF(2) and microwave electromagnetic radiation (3) and ultrasonic radiation (4). The electrical signal from the acoustic transducer (1) is amplified (5) and supplied to a digitizer (6), which provides a continuous stream of digital words corresponding to samples of the amplified signal. Because in most situations of practical interest the S/N ratio of a single pulse is much less than unity, it is necessary to signal-average the signals from many successive pulses. This is accomplished with a minicomputer or data processor ( 8) suitably interfaced (7) with the digitizer. The resulting data can then be suitably displayed as an image on a CRT display (9) or plotted or numerically printed out.

REFERENCES:
patent: 3771355 (1973-11-01), Sachs
patent: 4246784 (1981-01-01), Bowen
Bowen, "Radiation-Induced Thermoacoustic Soft Tissue Imaging", 1981 Ultrasonics Symposium, Jul. 1981.
Bowen et al., "Some Experimental Results on the Thermoacoustic Imaging of Tissue Equivalent Phantom Materials", 1981 Ultrasonics Symposium, Jul. 1981.
Rosencwaig et al., "High-Resolution Photoacoustic Thermowave Microscopy", Applied Physics Letters, vol. 36, No. 9, May 1, 1980, pp. 525-527.
Sachs, T. D. et al., "TAST: A Non-Invasive Tissue Analytic System", Proceedings of Seminar on Ultrasonic Tissue Characterization Held at NBS, Gaithersburg, Md., (May 28-30, 1975), pp. 153-163.
Thompson, J. E. et al., "Tumor Detection Using Microwave Enhanced Thermography and Computer Aided Analysis, 1979 IEEE MTT-S International Microwave Symposium, pp. 39-44.

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