Ultrasonic fan beam scanner for computerized time-of-flight tomo

Details Ultrasonic fan beam scanner for computerized time-of-flight tomo Ultrasonic fan beam scanner for computerized time-of-flight tomo

1976-08-20

1978-02-28

Queisser, Richard C.

Measuring and testing

Vibration

By mechanical waves

73628, 128 2V, G01N 2900

Patent

active

040758834

ABSTRACT:
A fast ultrasonic scanner for soft tissue imaging and/or characterization has a transmitter with a divergent beam pattern and an arcuate array of receivers. The propagation delay time of a short acoustic pulse traversing a water bath and immersed specimen depends on the velocity distribution and is detected at each receiver. Digital data is derived from the receiver signals at many angular positions of the scan apparatus and is used to compute a reconstruction of the velocity distribution in the specimen. The instrument provides quantitative measurements of bulk tissue and has application in breast examination and mass screening for breast cancer.

REFERENCES:
patent: 3794964 (1974-02-01), Katakura
patent: 3940625 (1976-02-01), Hounsfield
patent: 3959770 (1976-05-01), Schaefer
Greenleaf et al, "Algebraic Reconstruction of Spatial Distributions of Acoustic Velocities in Tissue," Acoustical Holography, vol. 6, 1975, pp. 71-90.
Knollman et al, "Real Time Ultrasonic Imaging Methodology in Nondestructive Testing," Journal of Acoustical Society of Amer., vol. 58, No. 2, pp. 455-470, Aug. 1975.
Von Ramm et al, "Cardiovascular Diagnosis with Real Time Ultrasound Imaging," Acoustical Holography, vol. 6, 1975, pp. 91-95.

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