Title:
【発明の名称】超音波エコーグラフの固定エコーを除くデバイス
Document Type and Number:
Japanese Patent JP2648619
Kind Code:
B2
Abstract:
A device for eliminating fixed echoes for an ultrasonic echograph, comprising a first filter (100) which consists on the one hand of M parallel lines i (i=1, . . . , M) which a respective delay (i-1)T, where T is the repetition period of the echograph, and on the other hand of weighting means (101i) for the M lines i, the sum of the coefficients (ai) applied to said lines being zero and, of an adder (102) for the lines i thus delayed and weighted. In accordance with the invention, at least one second filter (200) which has the same structure as and which is dephased by (M-1)T with respect to the first filter (100) is connected parallel to the first filter (100), the pulse response (h2(t)) of the second filter being linked to the pulse response (h1(t)) of the first filter as: h2(t)=h1(m-1)T-t). Application: Measurement and imaging of blood flow speeds by ultrasonic echography.
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Inventors:
PATORITSUKU RUNE PESUKU
ODEIIRU MARIA ANDOREE BONNUFU
ODEIIRU MARIA ANDOREE BONNUFU
Application Number:
JP16788788A
Publication Date:
September 03, 1997
Filing Date:
July 07, 1988
Export Citation:
Assignee:
FUIRITSUPUSU EREKUTORONIKUSU NV
International Classes:
G01S7/526; G01S15/52; G01S15/89; A61B8/14; H03H15/00; H03H17/06; (IPC1-7): G01S7/526; A61B8/14; G01S15/89
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)