G - Physics – 01 – S
Patent
G - Physics
01
S
349/33, 349/36
G01S 15/52 (2006.01) A61B 8/08 (2006.01) G01S 7/52 (2006.01) G06T 7/20 (2006.01)
Patent
CA 1267719
PHF 86.504 14 11.11.1986 ABSTRACT: "Device for examining moving objects by means of ultra- sound echography". The device comprises at least one ultrasound transducer (10) which is connected to a transmitter stage (20) and to a stage (30) for receiving and processing echographic signals returned to the transducer. The latter stage (30) comprises a conventional first processing channel (60) which consists mainly of an amplifier cir- cuit (61, an envelope detection circuit (62), a scan con- verter (64), and a display device (65), as well as a se- cond processing channel (100) which comprises: (A) an analog-to-digital converter (63) and a first image memory (641) for storing the image during acquisition; (B) a motion detection circuit (130 which con- trols, or not, for each image point the application of a recursive temporal filtering coefficient.alpha.; (C) a conditional recursive temporal filter cir- cuit (150) which supplies, on the output of said second processing channel (100), a treated image R(t, x, y) which forms a sum of the image I(t, x, y) most recently obtained and the preceding treated image R(t-1, x, y), weighted by values relating to said filter coefficient .alpha..
528434
Fetherstonhaugh & Co.
N.v. Philips Gloeilampenfabrieken
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