公开(公告)号：DE69529798D1

公开(公告)日：2003-04-10

申请号：DE69529798

申请日：1995-11-22

Applicant: ADVANCED TECH LAB

Inventor： JOHNSON KEITH W ,  POWERS JEFFRY E

IPC: A61B8/00 ,  G01S7/52

公开(公告)号：AT156984T

公开(公告)日：1997-09-15

申请号：AT91303404

申请日：1991-04-17

Applicant: ADVANCED TECH LAB

Inventor： POWERS JEFFRY E

IPC: A61B8/00 ,  A61B8/08 ,  A61B8/14 ,  A61B17/22 ,  A61B17/34

Abstract: A system for imaging a biopsy needle with ultrasound is shown in which the needle tip elicits a Doppler response through controlled reciprocation of the needle tip. In a preferred embodiment the biopsy needle includes a hollow cannula (40) which carries a removable stylet. Means for reciprocating (44) the stylet is coupled to the proximal end of the stylet, and the distal tip of the stylet is reciprocated at the distal end of the cannula. This motion is detected through Doppler interrogation of the body region at which the biopsy is to be performed, and the Doppler response of the needle tip in the image of the body region allows the needle tip to be monitored as it approaches the tissue to be biopsied.

公开(公告)号：DE69118645D1

公开(公告)日：1996-05-15

申请号：DE69118645

申请日：1991-10-11

Applicant: ADVANCED TECH LAB

Inventor： PETERSON ROY BECK ,  POWERS JEFFRY E

IPC: A61B8/06 ,  G01F1/66 ,  G01P5/00 ,  G01P5/24 ,  G01S15/52 ,  G01S15/58 ,  G01S15/89

Abstract: An ultrasonic diagnostic system for measuring fluid flow velocities through Doppler techniques is provided which eliminates the effects of tissue motion from fluid flow velocity information. Doppler information signals are discriminated to determine the presence of signal components resulting from moving tissue, which signal components are located at frequencies of a Doppler spectrum other than the predetermined frequency location of stationary tissue signals. The tissue motion signal components present are shifted to the predetermined frequency location and removed by high pass filtering the Doppler signals. The remaining signals are then shifted back to their original frequency location and transmitted to a Doppler velocity estimator for further processing of the fluid flow velocity information and ultimate display of the information. To overcome problems of Doppler frequency inaccuracies at discrete spatial positions, the Doppler signals from a plurality of neighbouring spatial locations are examined in the aggregate to determine the frequency location of tissue motion signal components.

公开(公告)号：AT136447T

公开(公告)日：1996-04-15

申请号：AT91309373

申请日：1991-10-11

Applicant: ADVANCED TECH LAB

Inventor： PETERSON ROY BECK ,  POWERS JEFFRY E

IPC: A61B8/06 ,  G01F1/66 ,  G01P5/00 ,  G01P5/24 ,  G01S15/52 ,  G01S15/58 ,  G01S15/89

Abstract: An ultrasonic diagnostic system for measuring fluid flow velocities through Doppler techniques is provided which eliminates the effects of tissue motion from fluid flow velocity information. Doppler information signals are discriminated to determine the presence of signal components resulting from moving tissue, which signal components are located at frequencies of a Doppler spectrum other than the predetermined frequency location of stationary tissue signals. The tissue motion signal components present are shifted to the predetermined frequency location and removed by high pass filtering the Doppler signals. The remaining signals are then shifted back to their original frequency location and transmitted to a Doppler velocity estimator for further processing of the fluid flow velocity information and ultimate display of the information. To overcome problems of Doppler frequency inaccuracies at discrete spatial positions, the Doppler signals from a plurality of neighbouring spatial locations are examined in the aggregate to determine the frequency location of tissue motion signal components.

公开(公告)号：DE69127310T2

公开(公告)日：1998-01-22

申请号：DE69127310

申请日：1991-04-17

Applicant: ADVANCED TECH LAB

Inventor： POWERS JEFFRY E

IPC: A61B8/00 ,  A61B8/08 ,  A61B8/14 ,  A61B17/22 ,  A61B17/34

Abstract: A system for imaging a biopsy needle with ultrasound is shown in which the needle tip elicits a Doppler response through controlled reciprocation of the needle tip. In a preferred embodiment the biopsy needle includes a hollow cannula (40) which carries a removable stylet. Means for reciprocating (44) the stylet is coupled to the proximal end of the stylet, and the distal tip of the stylet is reciprocated at the distal end of the cannula. This motion is detected through Doppler interrogation of the body region at which the biopsy is to be performed, and the Doppler response of the needle tip in the image of the body region allows the needle tip to be monitored as it approaches the tissue to be biopsied.

公开(公告)号：DE3676755D1

公开(公告)日：1991-02-14

申请号：DE3676755

申请日：1986-05-28

Applicant: ADVANCED TECH LAB

Inventor： DESJARDINS PHILIP A ,  POWERS JEFFRY E

IPC: G01S7/527 ,  A61B8/00 ,  A61B8/06 ,  G01S7/536 ,  G01S15/50 ,  G01S15/52

公开(公告)号：CA1262276A

公开(公告)日：1989-10-10

申请号：CA509991

申请日：1986-05-26

Applicant: ADVANCED TECH LAB

Inventor： DESJARDINS PHILIP A ,  POWERS JEFFRY E

IPC: G01S7/527 ,  A61B8/00 ,  A61B8/06 ,  G01S7/536 ,  G01S15/50 ,  G01S15/52

Abstract: RANGE-CONTINUITY ANTI-ALIASING A Doppler blood velocity measuring device is described which includes anti-aliasing circuitry. The anti-aliasing circuitry is based upon the use of a multigate Doppler unit which receives Doppler shift frequency information from various depth ranges. Thereafter, the Doppler frequencies received are corrected by adding a correction frequency to the perceived Doppler frequency with the correction frequency selected based on the assumption that blood flow velocity cannot change drastically between adjacent depths.