Image processing apparatus and image processing method for use in the image processing apparatus

• US 5,706,816 A
• Filed: 07/16/1996
• Issued: 01/13/1998
• Est. Priority Date: 07/17/1995
• Status: Expired due to Term

• Current Assignee: Hitachi Aloka Medical, Ltd (Hitachi, Ltd.)
• Original Assignee: Aloka Company Limited (Hitachi, Ltd.)
• Inventors: Mochizuki, Takashi, Akahane, Mutsuhiro
• Primary Examiner(s): JAWORSKI, FRANCIS J
• Application Number:
  US08/682,909
• Time in Patent Office: 546 Days
• Field of Search: 128/916, 128/660.07, 128/661.01, 364/413.25
• US Class Current: 600/443
• CPC Class Codes: G01S 15/8918 the array being linear
• CPC Class Codes: G01S 15/8945 using transducers mounted for linear mechanical movement
• CPC Class Codes: G01S 15/8993 Three dimensional imaging systems
• CPC Class Codes: G01S 7/52034 Data rate converters
• CPC Class Codes: G01S 7/5206 Two-dimensional coordinated display of distance and direction; B-scan display
• CPC Class Codes: Y10S 128/916 Ultrasound 3-D imaging

Abstract

An image processing apparatus includes an ultrasound transducer for sequentially emitting ultrasound beams and receiving respective echoes of the ultrasound beams to produce a scanning plane; a mechanism for displacing the ultrasound transducer to move the scanning plane in a three-dimensional region; a three-dimensional image data generator for sequentially obtaining echo data of the respective ultrasound beams from the echo of the respective ultrasound beams upon receipt of the echo by the ultrasound transducer, and for sequentially generating, based on the echo data of the respective ultrasound beams, brightness value data for each ultrasound beam corresponding to a brightness value for one 1! pixel in an ultrasound image for the three-dimensional region; a memory, having addresses corresponding to respective pixels in the ultrasound image, for sequentially storing the brightness value data for the respective ultrasound beams generated by the three-dimensional image data generator at the corresponding addresses thereof; and a display for displaying the ultrasound image based on the brightness value data stored in the memory. This apparatus can produce a new three-dimensional ultrasound image having properties of both a stereographic surface image and a stereographic transparent image like an X-ray in a real time.

Claims

1. An ultrasound image processing apparatus, comprising:

an ultrasound transducer for sequentially emitting ultrasound beams and receiving respective echoes of said ultrasound beams within a scanning plane;

means for displacing said ultrasound transducer to move said scanning plane in a three-dimensional region;

a three-dimensional image data generating means for sequentially obtaining echo data of the respective ultrasound beams from the echo of the respective ultrasound beams upon receipt of the echo by said ultrasound transducer, and for sequentially generating, based on the echo data of the respective ultrasound beams, brightness value data for each ultrasound beam corresponding to a brightness value for one pixel in an ultrasound image for said three-dimensional region;

memory means, having addresses corresponding to respective pixels in said ultrasound image, for sequentially storing the brightness value data for the respective ultrasound beams generated by said three-dimensional image data generating means at the corresponding addresses thereof; and

display means for displaying the ultrasound image of said three-dimensional region, based on said brightness value data stored in said memory means.

2. The ultrasound image processing apparatus as set forth in claim 1, wherein said image data generating means operates so that display means displays such ultrasound image that corresponds to an image which can be seen on a mapping plane which is virtually set as a plane on which said ultrasound beams passing through said three-dimensional region are projected, in which said ultrasound beams being emitted toward said three-dimensional region are assumed to be lines of vision.

3. The ultrasound image processing apparatus as set forth in claim 1, wherein the ultrasound transducer operates so that said ultrasound beams being emitted toward said three-dimensional region from said ultrasound transducer correspond to the pixels in said ultrasound image, respectively, and said memory means stores the brightness value data for each of said ultrasound beams as the brightness value for the corresponding pixel.

4. The ultrasound image processing apparatus as set forth in claim 3, wherein said memory means comprises a frame memory having addresses corresponding to the respective pixels in said ultrasound image.

5. The ultrasound image processing apparatus as set forth in claim 3, wherein each time said three-dimensional image data generating means generates the brightness value data for each of said ultrasound beams, said memory means stores the brightness value data for the ultrasound beam, and said memory means retains brightness value data for all of said ultrasound beams corresponding to the respective pixels in said ultrasound image, upon completion of scanning for said three-dimensional region.

6. The ultrasound image processing apparatus as set forth in claim 1, wherein said three-dimensional image data generating means comprises:

a transparent image data generating means for generating transparent image data which reflects a change of strength of the echo in the respective echo data at a plurality of sampling points of the ultrasound beam along the beam emitting direction thereof to the brightness value data for the ultrasound beam in such a way that such a change is visualized in the brightness value at the corresponding pixel of the ultrasound image.

7. The ultrasound image processing apparatus as set forth in claim 6, wherein said transparent image data generating means performs a volume-rendering operation for the echo data based on the assumption that the ultrasound beam is considered to be light, such that said generating means obtains a data considered to be a quantity of outputted light at each of said plurality of sampling points from respective echo data at each of said plurality of sampling points on said ultrasound beam, in which the quantity of the outputted light is related to the strength of echo obtained from the respective sampling point;

sequentially operates the quantity of the outputted light at each of said plurality of sampling points along the beam projecting direction; and

determines the brightness value data for said ultrasound beam, based on the result of the above operation.

8. The ultrasound image processing apparatus as set forth in claim 7, wherein said transparent image data generating means comprises:

an opacity operator means for obtaining, from the echo data at each of said plurality of sampling points on said ultrasound beam, an opacity at each of said plurality of sampling points, said opacity being defined by a value of the respective echo data;

a transparency operator means for obtaining, from the echo data at each of said plurality of sampling points on said ultrasound beam, a transparency at each of said plurality of sampling points, said transparency being defined by the value of the respective echo data;

a quantity of luminescence operator means for obtaining a quantity of luminescence at each of said plurality of sampling points, the quantity of luminescence being obtained by multiplying the echo data at each of said plurality of sampling points by said opacity; and

a quantity of transmitted light operator means for obtaining a quantity of transmitted light at each of said plurality of sampling points, the quantity of transmitted light being obtained by multiplying the transparency at each of said plurality of sampling points by a quantity of outputted light at its immediately preceding sampling point;

wherein

the quantity of outputted light at each of said plurality of sampling points is obtained by adding the quantity of luminescence to the quantity of transmitted light.

9. The ultrasound image processing apparatus as set forth in claim 8, wherein said opacity is defined as a function of the echo data, and an opacity varying means is further provided for varying a coefficient included in the function.

10. The ultrasound image processing apparatus as set forth in claim 8, wherein said opacity operator means comprises a ROM table in which data corresponding to a relationship between the value of said echo data and said opacity are stored.

11. An ultrasound image processing method, comprising the steps of:

emitting a plurality of ultrasound beams from an ultrasound transducer sequentially to a three-dimensional region, and receiving their echoes by said ultrasound transducer;

sequentially obtaining echo data for the respective ultrasound beams from the echo of the respective ultrasound beams upon receipt of the echo by said ultrasound transducer, and for sequentially generating, based on the echo data of the respective ultrasound beams, brightness value data for each ultrasound beam corresponding to a brightness value for one pixel in an ultrasound image for said three-dimensional region;

sequentially storing the brightness value data for the respective ultrasound beams at predetermined addresses in a memory means; and

displaying an ultrasound image in said three-dimensional region, based on the brightness value data for each of said plurality of ultrasound beams stored in said memory means, said ultrasound image being represented as if said plurality of ultrasound beams are utilized as lines of vision.

12. An ultrasound image processing apparatus, comprising:

ultrasound transducer means for sequentially emitting ultrasound beams along a scanning plane and for receiving respective echoes of said ultrasound beams;

means for displacing said ultrasound transducer means within a three-dimensional region including said scanning plane;

means for sequentially generating, based on echo data obtained from the echo of the respective ultrasound beams, brightness value data for each ultrasound beam corresponding to a brightness value for one pixel in an ultrasound image of said three-dimensional region, said brightness value data reflecting a change of strength of the echo in the respective echo data at a plurality of sampling points of each ultrasound beam along the beam emitting direction thereof so that such a change is visualized in the brightness value at the corresponding pixel;

memory means, having predetermined addresses corresponding to the respective pixels in said ultrasound image, for sequentially storing brightness value data for the respective ultrasound beams generated by said generating means at the predetermined addresses; and

display means for displaying an ultrasound image of said three-dimensional region, based on said brightness value data stored in said memory means.

13. The ultrasound image processing apparatus as set forth in claim 12, wherein said generating means performs a volume-rendering operation for the echo data based on the assumption that the ultrasound beam is considered to be light, such that said generating means obtains a data considered to be a quantity of outputted light at each of said plurality of sampling points from respective echo data at each of said plurality of sampling points on said ultrasound beam, in which the quantity of the outputted light is related to the strength of echo obtained from the respective sampling point;

sequentially operates the quantity of the outputted light at each of said plurality of sampling points along the beam projecting direction; and

determines the brightness value data for said ultrasound beam, based on the result of the above operation.

14. The ultrasound image processing apparatus as set forth in claim 13, wherein said transparent image data generating means comprises:

opacity operator means for obtaining, from the echo data at each of said plurality of sampling points on said ultrasound beam, an opacity at each of said plurality of sampling points, said opacity being defined by a value of the respective echo data;

transparency operator means for obtaining, from the echo data at each of said plurality of sampling points on said ultrasound beam, a transparency at each of said plurality of sampling points, said transparency being defined by the value of the respective echo data;

quantity of luminescence operator means for obtaining a quantity of luminescence at each of said plurality of sampling points, the quantity of luminescence being obtained by multiplying the echo data at each of said plurality of sampling points by said opacity; and

quantity of transmitted light operator means for obtaining a quantity of transmitted light at each of said plurality of sampling points, the quantity of transmitted light being obtained by multiplying the transparency at each of said plurality of sampling points by a quantity of outputted light at its immediately preceding sampling point, the quantity of the outputted light is related to the strength of echo obtained from the respective sampling point;

wherein

said quantity of outputted light at each of said plurality of sampling points is obtained by adding the quantity of luminescence to the quantity of transmitted light.

15. The ultrasound image processing apparatus as set forth in claim 14, wherein said opacity is defined as a function of the echo data, and an opacity varying means is further provided for varying a coefficient included in the function.

16. The ultrasound image processing apparatus as set forth in claim 15, wherein said opacity operator means comprises a ROM table in which data corresponding to a relationship between the value of said echo data and said opacity are stored.

17. An image processing apparatus, comprising:

means for sequentially emitting beams toward a three-dimensional region and receiving the reflected beams;

means for sequentially generating a brightness value data for each of the received beams each time the beam is received;

memory means having predetermined addresses corresponding to the respective beams, said memory means sequentially storing the brightness value data for the respective beams generated by said brightness value data generating means at the corresponding predetermined addresses; and

display means for displaying an image of said three-dimensional region, based on said brightness value data stored in said memory means, in which the image is composed of a plurality of pixels, and these pixels correspond to the beams, respectively.

18. An image processing apparatus, comprising:

a transducer for sequentially emitting beams toward a three-dimensional region and receiving echoes of the beams reflected therefrom;

a three-dimensional image data generating means for sequentially obtaining echo data of the respective beams from the echo of the respective beams upon receipt of the echo by said transducer, and for sequentially generating, based on the echo data of the respective beams, brightness value data for each beam corresponding to a brightness value for one pixel in an image for said three-dimensional region;

memory means, having addresses corresponding to respective pixels in said image, for sequentially storing the brightness value data for the respective beams generated by said three-dimensional image data generating means at the corresponding addresses thereof; and

display means for displaying the image of said three-dimensional region, based on said brightness value data stored in said memory means.

19. The image processing apparatus as claimed in claim 18, said beam is an electromagnetic wave.

20. The image processing apparatus as claimed in claim 18, said beam is an ultrasound beam.

21. An ultrasound diagnostic apparatus, comprising:

means for transmitting and receiving ultrasound beams to and from a three-dimensional region to scan the three-dimensional region;

means for producing brightness value data for the respective ultrasound beams based on an echo of each of the received ultrasound beams; and

means for displaying a three-dimensional ultrasound image of the three-dimensional region based on the brightness value data for the ultrasound beams, in which pixels of the ultrasound image correspond to the ultrasound beams one by one.

22. An ultrasound diagnostic apparatus, comprising:

means for transmitting and receiving ultrasound beams to and from a three-dimensional region in which an object is placed to scan the three-dimensional region;

means for selectively producing a three-dimensional surface image data of the object or a three-dimensional transparent image data of the object based on echoes of the received ultrasound beams; and

means for displaying a three-dimensional ultrasound image based on the ultrasound image data produced by the producing means.

23. An ultrasound diagnostic apparatus, comprising:

means for transmitting and receiving ultrasound beams to and from a three-dimensional region in which an object is placed to scan the three-dimensional region;

means for producing, based on echoes of the received ultrasound beams, a three-dimensional image data for a three-dimensional image of the object which can be varied from a three-dimensional surface image of the object to a three-dimensional transparent image of the object as desired; and

means for displaying a three-dimensional ultrasound image based on the ultrasound image data produced by the producing means.