Method and apparatus for generating volume flow measurement

• US 5,682,896 A
• Filed: 03/28/1996
• Issued: 11/04/1997
• Est. Priority Date: 03/28/1996
• Status: Expired due to Fees

• Current Assignee: Diasonics Ultrasound, Inc. (IDB Holding Corporation Limited)
• Original Assignee: Diasonics Ultrasound, Inc. (IDB Holding Corporation Limited)
• Inventors: Owen, Cindy A., Scheib, John P.
• Primary Examiner(s): MANUEL, GEORGE C
• Application Number:
  US08/624,192
• Time in Patent Office: 586 Days
• Field of Search: 128/661.08, 128/661.09, 128/661.1, 128/660.05, 73/861.25
• US Class Current: 600/456
• CPC Class Codes: A61B 8/06 Measuring blood flow measuring volume flow in general G01F, e.g. G01F1/66, G01F1/72; measuring speed of fluids in general G01P5/00
• CPC Class Codes: A61B 8/488 involving Doppler signals
• CPC Class Codes: G01S 15/8979 Combined Doppler and pulse-echo imaging systems
• CPC Class Codes: G01S 7/52073 Production of cursor lines, markers or indicia by electronic means

Abstract

A computer implemented method and apparatus for generating a vascular volume flow measurement in a living subject using an ultrasonic system by determining a velocity measurement and an area measurement at the same location in a blood vessel. The present invention generates an angle correct cursor on a display indicating where in a vessel a velocity measurement is being obtained. A diameter measure cursor is fixed perpendicular to the angle correct cursor to determine a diameter of the vessel at the same location of the vessel where the velocity measurement is obtained. The diameter is multiplied with the time averaged means velocity to accurately generate the volume flow. In one embodiment, the length of the diameter measure cursor is adjustable to extend a first end and an opposing second end of the diameter measure cursor, approximately to the walls of the vessel. In a second embodiment, the diameter measure cursor is adjustable to slide the cursor along its length to be approximately in a center of the vessel, while maintaining the diameter measure cursor to be perpendicular to the angle correct cursor. The velocity measurement, in the present invention, is generated by emitting pulses into a subject under examination, receiving echoes and determining Doppler frequency shifts from the pulses, and translating the Doppler frequency shifts to velocity information.

Claims

1. A method for generating a vascular volume flow measurement in a living subject using an ultrasonic system, the method comprising the steps of:

a) generating a velocity measurement of a volume in a vessel;

b) generating a rotatable angle correct cursor on a display, the angle correct cursor indicating a point of the vessel where the velocity measurement is generated, said angle correct cursor operable to determine an angle of said vessel for correcting said velocity measurement; and

c) generating a diameter measure cursor on the display, the diameter measure cursor is fixed to the angle correct cursor and is used to determine an approximate diameter of the vessel at the point of the vessel where the velocity measurement is generated.

2. The method of claim 1, wherein the velocity measurement is generated by emitting pulses into a subject under examination, receiving echoes and determining Doppler frequency shifts from the pulses, and translating the Doppler frequency shifts to velocity information.

3. The method of claim 2, wherein the diameter measure cursor is perpendicular to the angle correct cursor.

4. A method for generating a vascular volume flow measurement in a living subject using an ultrasonic system, the method comprising the steps of:

a) generating a velocity measurement of a volume in a vessel;

b) generating an angle correct cursor on a display, the angle correct cursor indicating a point of the vessel where the velocity measurement is generated; and

c) generating a diameter measure cursor on the display, the diameter measure cursor is fixed to the angle correct cursor and is used to determine an approximate diameter of the vessel at the point of the vessel where the velocity measurement is generated, wherein the diameter measure cursor and the angle correct cursor are jointly rotatable.

5. The method of claim 4, further includes the step of:

d) adjusting a length of the diameter measure cursor.

6. The method of claim 5, wherein the step of adjusting the length of the diameter measure cursor includes extending a first end and an opposing second end of the diameter measure cursor, approximately, to the edges of the vessel.

7. The method of claim 5, further including the step of:

e) adjusting a position of the diameter measure cursor.

8. The method of claim 7, wherein the step of adjusting a position of the diameter measure cursor includes sliding the diameter measure cursor along the length of the diameter measure cursor to be approximately in a center of the vessel and maintaining the diameter measure cursor to be perpendicular to the angle correct cursor.

9. The method of claim 8, wherein the diameter measure cursor is a shape of a capital letter I.

10. An apparatus for making vascular volume flow measurements within a living subject in an ultrasonic system comprising:

a first circuit for determining a velocity in a vessel by emitting pulses into the subject under examination, receiving echoes in response to the pulses and determining Doppler frequency shifts from the pulses, and translating the Doppler frequency shifts to velocity information;

a second circuit coupled to the first circuit for generating a rotatable angle correct cursor on a display of the system, the angle correct cursor showing an area of the vessel where the velocity is determined, said angle correct cursor operable to determine an angle of said vessel for correcting said velocity; and

a third circuit coupled to the second circuit for generating a diameter measuring cursor on the display for determining a diameter of the area of the vessel where the velocity is determined, wherein the diameter measuring cursor is fixed to the angle correct cursor.

11. The apparatus of claim 10, further comprising a fourth circuit coupled to the third circuit for using the diameter generated by the third circuit and the velocity generated by the first circuit to generate a measurement of a volume flow at the area of the vessel where the velocity measurement is determined.

12. The apparatus of claim 11, wherein the diameter measure cursor generated by the third circuit is perpendicular to the angle correct cursor.

13. An apparatus for making vascular volume flow measurements within a living subject in an ultrasonic system comprising:

a first circuit for determining a velocity in a vessel by emitting pulses into the subject under examination, receiving echoes in response to the pulses and determining Doppler frequency shifts from the pulses, and translating the Doppler frequency shifts to velocity information;

a second circuit coupled to the first circuit for generating an angle correct cursor on a display of the system, the angle correct cursor showing an area of the vessel where the velocity is determined; and

a third circuit coupled to the second circuit for generating a diameter measuring cursor on the display for determining a diameter of the area of the vessel where the velocity is determined, wherein the diameter measuring cursor is fixed to the angle correct cursor, wherein the diameter measure cursor generated by the third circuit and the angle correct cursor generated by the second circuit, are jointly rotatable.

14. The apparatus of claim 13, wherein the third circuit includes the ability to adjust a length of the diameter measure cursor.

15. The apparatus of claim 14, wherein the third circuit further includes the ability to extend a first arm and an opposing second arm of the diameter measure cursor.

16. The apparatus of claim 15, wherein the third circuit further includes the ability to slide the diameter measure cursor along a length of the diameter measure cursor and maintain the diameter measure cursor to be perpendicular to the angle correct cursor.

17. The apparatus of claim 15, wherein the diameter measure cursor generated by the third circuit is a shape of a capital letter I.

18. An apparatus for making vascular volume flow measurements within a living subject in an ultrasonic system comprising:

a velocity determining means for determining a velocity in a vessel by emitting pulses into the subject under examination, receiving echoes in response to the pulses and determining Doppler frequency shifts from the pulses, and translating the Doppler frequency shifts to velocity information;

a rotatable angle correct cursor generating means coupled to the velocity determining means for generating an angle correct cursor on a display of the system, the angle correct cursor showing an area of the vessel where the velocity is determined, said angle correct cursor operable to determine an angle of said vessel for correcting said velocity; and

a diameter measuring cursor means coupled to the angle correct cursor generating means for generating a diameter measuring cursor on the display for determining a diameter of the area of the vessel where the velocity is determined, wherein the diameter measuring cursor is fixed to the angle correct cursor.

19. The apparatus of claim 18, further comprises a volume flow measurement means for generating a volume flow measurement at the area of the vessel where the velocity measurement is determined.

20. The apparatus of claim 19, wherein the diameter measure cursor is approximately perpendicular to the angle correct cursor.

21. An apparatus for making vascular volume flow measurements within a living subject in an ultrasonic system comprising:

a velocity determining means for determining a velocity in a vessel by emitting pulses into the subject under examination, receiving echoes in response to the pulses and determining Doppler frequency shifts from the pulses, and translating the Doppler frequency shifts to velocity information;

an angle correct cursor generating means coupled to the velocity determining means for generating an angle correct cursor on a display of the system, the angle correct cursor showing an area of the vessel where the velocity is determined; and

a diameter measuring cursor means coupled to the angle correct cursor generating means for generating a diameter measuring cursor on the display for determining a diameter of the area of the vessel where the velocity is determined, wherein the diameter measuring cursor is fixed to the angle correct cursor, further comprises a rotation means coupled to the volume flow measurement means for jointly rotating the diameter measure cursor and the angle correct cursor.

22. The apparatus of claim 21, further comprises a length adjusting means coupled to the volume flow measurement means for adjusting a length of the diameter measure cursor.

23. The apparatus of claim 22, the means for adjusting the length of the diameter measure cursor includes a first circuit for extending a first arm and an opposing second arm of the diameter measure cursor.

24. The apparatus of claim 23, a sliding means coupled to the means for adjusting the length of the diameter measure cursor for sliding the diameter measure cursor along a length of the diameter measure cursor and maintaining the diameter measure cursor to be approximately perpendicular to the angle correct cursor.

25. The apparatus of claim 24, wherein the diameter measure cursor is a shape of a capital letter I.