Ultrasound diagnosis apparatus for generating an image based on extracted harmonics component

• US 6,146,330 A
• Filed: 04/09/1999
• Issued: 11/14/2000
• Est. Priority Date: 04/10/1998
• Status: Expired due to Term

• Current Assignee: Toshiba Medical Systems Corporation (Canon Inc.)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Tujino, Hiroyuki, Mine, Yoshitaka, Sasaki, Takuya
• Primary Examiner(s): Lateef, Marvin M.
• Assistant Examiner(s): Imam, Ali M.
• Application Number:
  US09/288,851
• Time in Patent Office: 585 Days
• Field of Search: 600/440, 600/443, 600/447, 600/454, 600/458
• US Class Current: 600/443
• CPC Class Codes: G01S 15/8988 Colour Doppler imaging
• CPC Class Codes: G01S 7/52034 Data rate converters
• CPC Class Codes: G01S 7/52038 involving non-linear properties of the propagation medium or of the reflective target
• CPC Class Codes: G01S 7/52046 Techniques for image enhancement involving transmitter or receiver image enhancement by image data processing G06T5/00
• CPC Class Codes: G01S 7/5206 Two-dimensional coordinated display of distance and direction; B-scan display

Abstract

An ultrasound wave is transmitted to a target object through an ultrasound probe, and an echo signal returning from the target object is received through the ultrasound probe. In a fundamental wave mode, a fundamental wave component is extracted from the echo signal, and an image is generated based on the fundamental wave component. In a harmonics mode, a harmonics component is extracted, and an image is generated based on the harmonics component. The focal strength ratio of the ultrasound wave in the harmonica mode is changed between in the harmonics mode and in the fundamental wave mode. As a result, images with high quality can be obtained in both the fundamental wave mode and the harmonics mode.

Claims

1. An ultrasound diagnosis apparatus comprising:

a multi-channel type ultrasound probe;

a transmitting/receiving device for transmitting an ultrasound wave to a target object through the ultrasound probe and for receiving an echo signal returning from the target object through the ultrasound probe;

a filter for extracting a fundamental wave component from the echo signal;

a filter for extracting a harmonics component from the echo signal;

a processor for generating an image based on the extracted fundamental wave component in a fundamental wave mode, and for generating an image based on the extracted harmonics component in a harmonics mode; and

a controller for controlling said transmitting/receiving device such that a focal strength ratio of the ultrasound wave in the harmonics mode differs from a focal strength ratio of the ultrasound wave in the fundamental wave mode.

2. An apparatus according to claim 1, wherein the focal strength ratio in the harmonics mode is rendered higher than the focal strength ratio in said fundamental wave mode, through control by the controller.

3. An apparatus according to claim 1, wherein a focus of the ultrasound wave is located at a region of interest in the fundamental wave mode and at a position shallower than the region of interest in the harmonics mode, through control by said controller.

4. An apparatus according to claim 1, wherein a focus of the ultrasound wave is located at a position shallower than a focus of the ultrasound wave in the fundamental wave mode through control by said controller.

5. An apparatus according to claim 1, wherein when the fundamental wave mode is switched to the harmonics mode, a focus of the ultrasound wave is switched to a shallow position through control by said controller.

6. An apparatus according to claim 1, wherein the ultrasound wave is transmitted to have a combination focus, in the harmonics mode, through control by said controller.

7. An apparatus according to claim 1, wherein the focal strength ratio of the ultrasound wave in the fundamental wave mode is set to 0.3 or less and is set to a value higher than 0.3 in the harmonics mode, through control by said controller, and the focal strength ratio of the ultrasound wave is obtained by D/Z0 where D is a transmission diameter of said ultrasound probe and Z0 is a focus depth of the ultrasound wave.

8. An apparatus according to claim 1, wherein a transmission diameter of said ultrasound probe in the harmonics mode is set to be different from that in the fundamental wave mode, through control by said controller.

9. An apparatus according to claim 1, wherein a plurality of channels driven in the fundamental wave mode are adjacent to each other and a plurality of channels driven in the harmonics mode are interspersed through control by said controller.

10. An apparatus according to claim 1, wherein a plurality of channels are driven in a subtractive manner in the harmonics mode, through control by said controller.

11. An apparatus according to claim 1, wherein a plurality of channels driven in the harmonics mode are interspersed in at least one of two perpendicular axes through control by said controller.

12. An ultrasound diagnosis apparatus comprising:

a transmitting/receiving device for transmitting an ultrasound wave to a target object and for receiving an echo signal returning from the target object, the ultrasound wave including at least two kinds of fundamental frequencies;

a filter for extracting a specific frequency component from the echo signal, the specific frequency component including at least one of a frequency of a sum of the two kinds of fundamental frequencies, a frequency of a difference between the two kinds of fundamental frequencies, and a frequency of a difference between frequencies defined by multiplying the two kinds of fundamental frequencies by an integer; and

a processor for generating an image based on the extracted specific frequency component.

13. An ultrasound diagnosis apparatus comprising:

a multi-channel type ultrasound probe;

a transmitting/receiving device for transmitting an ultrasound wave to a target object through the ultrasound probe and for receiving an echo signal returning from the target object through the ultrasound probe;

a filter for extracting a fundamental wave component from the echo signal;

a filter for extracting a harmonics component from the echo signal;

a processor for generating an image based on the extracted fundamental wave component in a fundamental wave mode, and for generating an image based on the extracted harmonics component in a harmonics mode; and

a controller for controlling said transmitting/receiving device such that a transmission diameter of said ultrasound probe in the harmonics mode differs from a transmission diameter of said ultrasound probe in the fundamental wave mode.

14. An ultrasound diagnosis apparatus comprising:

an ultrasound probe;

a transmitting/receiving device for transmitting an ultrasound wave to a target object through said ultrasound probe and for receiving an echo signal returning from the target object through said ultrasound probe;

a filter for extracting a fundamental wave component from the echo signal;

a filter for extracting a harmonics component from the echo signal;

a processor for generating an image based on the extracted fundamental wave component in a fundamental wave mode, and for generating an image based on the extracted harmonics component in a harmonics mode; and

a controller for controlling said transmitting/receiving device such that a focus depth of the ultrasound wave in the harmonics mode differs from a focus depth of the ultrasound wave in the fundamental wave mode.

15. An ultrasound diagnosis apparatus comprising:

an ultrasound probe;

a transmitting/receiving device for transmitting an ultrasound wave to a target object through said ultrasound probe and for receiving an echo signal returning from the target object through said ultrasound probe;

a filter for extracting a fundamental wave component from the echo signal;

a filter for extracting a harmonics component from the echo signal;

a processor for generating an image based on the extracted fundamental wave component in a fundamental wave mode, and for generating an image based on the extracted harmonics component in a harmonics mode; and

a controller for controlling said transmitting/receiving device such that a frequency of the ultrasound wave in the harmonics mode differs from a frequency of the ultrasound wave in the fundamental wave mode.

16. An ultrasound diagnosis apparatus comprising:

an ultrasound probe;

a transmitting/receiving device for transmitting an ultrasound wave to a target object through said ultrasound probe and for receiving an echo signal returning from the target object through said ultrasound probe;

a filter for extracting a fundamental wave component from the echo signal;

a filter for extracting a harmonics component from the echo signal;

a processor for generating an image based on the extracted fundamental wave component, and for generating an image based on the extracted harmonics component; and

a display for displaying the generated image based on the fundamental wave component and the generated image based on the harmonics component, on one screen.

17. An apparatus according to claim 16, wherein the fundamental wave component and the harmonics component are extracted from one same echo signal.

18. An apparatus according to claim 16, further comprising a controller for controlling said transmitting/receiving device, being capable of changing a transmission condition of the ultrasound wave between when extracting the fundamental wave component and when extracting the harmonics component, through control by said controller, and being capable of changing a transmission condition for the fundamental wave component and a transmission condition for the harmonics component alternately in accordance with a transmission rate.

19. An apparatus according to claim 16, further comprising a controller for controlling said transmitting/receiving device, being capable of changing a transmission condition of the ultrasound wave between when extracting the fundamental wave component and when extracting the harmonics component, through control by said controller, and being capable of changing a transmission condition for the fundamental wave component and a transmission condition for the harmonics component alternately in accordance with a frame rate.

20. An apparatus according to claim 16, wherein said processor synthesizes a marker indicating a depth at which a maximum sound pressure of a harmonic wave is obtained, into the image based on the harmonics component.

21. An apparatus according to claim 16, wherein the images based on the fundamental wave component and the harmonics component are partially synthesized.

22. An apparatus according to claim 16, wherein the image based on the harmonics component is inserted in a region of interest in the image based on the fundamental wave component.

23. An apparatus according to claim 16, further comprising a controller for changing a transmission condition of the ultrasound wave between when extracting the fundamental wave component and when extracting the harmonics component, and a processor for adding an echo signal obtained under a transmission condition for the fundamental wave component and an echo signal obtained under a transmission condition for the harmonics component to each other.

24. An apparatus according to claim 23, wherein said processor adds the echo signal of the fundamental component and the echo signal of the harmonic component to each other.

25. An apparatus according to claim 23, wherein said processor adds the echo signal obtained under the transmission condition for the fundamental wave component and the echo signal obtained under the transmission condition for the harmonics component to each other, at a ratio which varies for every depth.