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    Tissue characterisation using intravascular echoscopy
    2.
    发明专利
    Tissue characterisation using intravascular echoscopy 未知

    公开(公告)号：GB2291969A

    公开(公告)日：1996-02-07

    申请号：GB9521056

    申请日：1994-04-18

    Applicant: COMMW SCIENT IND RES ORG

    Inventor： WILSON LAURENCE SYDNEY ,  TALHAMI HABIB EMILE

    IPC: A61B8/12 ,  G01S7/52 ,  G01S15/89

    Abstract: Calcification of an artery wall and the presence of degenerative plaque on an artery are two symptoms of arterial disease. Ultrasonic echoscopy is used to monitor the presence of calcification of an artery wall. An intravascular transducer (10) at a location within an artery (15) is used to obtain frames of ultrasound during at least on cardiac cycle of a subject. The ultrasound data obtained is processed to produce an indication of the elasticity of the artery wall (12), namely the average fractional deformation of each region of the arterial tissue. This "elasticity" data is displayed simultaneously with an image of the artery wall. The presence of degenerative plaque is determined using intravascular echoscopy and monitoring the frequency content of echoes produced by backscatter from the tissue in the artery wall.

    Method and apparatus for determining the velocity of a flowing liquid
    6.
    发明专利
    Method and apparatus for determining the velocity of a flowing liquid 未知

    公开(公告)号：GB2259983A

    公开(公告)日：1993-03-31

    申请号：GB9221719

    申请日：1992-10-15

    Applicant: COMMW SCIENT IND RES ORG

    Inventor： WILSON LAURENCE SYDNEY

    IPC: A61B8/06 ,  G01P5/00 ,  G01P13/00 ,  G01S7/52 ,  G01S15/89

    Abstract: Calculation of the two-dimensional velocity vector (17) of liquid flowing through a region (3, 16) which is imaged in a B-mode ultrasonic echoscopy display involves dividing the region into a number of small, preferably rectangular, cells (4). One of the cells is scanned rapidly, at least twice, by a beam of ultrasonic energy which is transmitted sequentially along a number of lines of sight (2) which intersect the cell. An image of the cell is formed from the signals reflected from scatterers within the liquid in the cell during each scan of the cell. The two-dimensional brightness functions, S(x,y), of each image of the cell form of a data set S(x,y,t) after the repeated scanning. The data set S(x,y,t) is integrated separately with respect to x and y by projection onto the (x,t) and (y,t) planes. Using the projected functions of S(x,y,t), the average velocity of the scatterers in the cell (and hence of the liquid flowing through the cell) is obtained in the x-direction and in the y-direction. From these two average velocities, the magnitude and direction of the two-dimensional velocity vector is obtained, and displayed on the echogram. The scanning, imaging and computational procedures are then repeated for another of the cells.

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