Surgery – Truss – Pad
Patent
1994-02-16
1995-05-16
Manuel, George
Surgery
Truss
Pad
A61B 800
Patent
active
054151732
ABSTRACT:
An ultrasound diagnosis system including a plurality of elements arrayed for transmitting ultrasonic wave to a testing object and for receiving ultrasonic wave reflected from the testing object, a device for giving a delay time distribution to respective transmitting and receiving signals of the elements to thereby form an ultrasonic beam having directivity in a predetermined direction, a device for displaying a sectional image of the testing object, and a sound velocity distribution control device for changing sound velocities in the testing object to be set up in respective elements in accordance with a focal point position of the ultrasonic beam and the respective positions of the elements in order to determine the delay time distribution, wherein the system further includes a sound velocity distribution control device for changing sound velocities to be set up in the respective elements on the basis of functions forming a system of orthogonal functions in which array number successively given to respective array positions of the elements in a transmitting and receiving aperture composed of a predetermined number of the elements is regarded as a variable, and on the basis of expanding coefficients by which respective functions forming the system of orthogonal functions are multiplied respectively.
REFERENCES:
patent: 4664123 (1987-05-01), Iinuma
patent: 4779623 (1988-10-01), Sumino et al.
patent: 4781199 (1988-11-01), Hirama et al.
patent: 4974558 (1990-12-01), Katakura et al.
Ban Hideyuki
Kanda Hiroshi
Katakura Kageyoshi
Masuzawa Hiroshi
Miwa Yuichi
Hitachi , Ltd.
Manuel George
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