Apparatus for examining an object by using ultrasonic beams

Details Apparatus for examining an object by using ultrasonic beams Apparatus for examining an object by using ultrasonic beams

1984-05-24

1986-03-11

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

73620, G01N 2900

Patent

active

045746362

ABSTRACT:
In an ultrasonic examination apparatus of the sector scanning type, a false contour appears in a tomographic image of an object due to a variation of the pixelizing, or digitizing precision over the entire scanning region, especially near the central ultrasonic scanning lines. A wobbling processor is provided in an address generator for write operation. When the echo signals, or the image signals obtained by the scanning of the central untrasonic scanning lines are written into pixels of a frame memory, the write-in addresses are processed by the wobbling processor so that the pixelizing precision can be made relatively uniform over the entire scanning region.

REFERENCES:
patent: 4212072 (1980-07-01), Hualsman et al.
patent: 4310907 (1982-01-01), Tachita et al.
patent: 4368643 (1983-01-01), Tachita et al
patent: 4375671 (1983-03-01), Engle
patent: 4381675 (1983-05-01), Roberts et al.
patent: 4417475 (1983-11-01), Okazaki

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