Method for the processing of signals relating to an object comprising moving parts and echographic device for carrying out this method

• US 5,938,606 A
• Filed: 10/24/1997
• Issued: 08/17/1999
• Est. Priority Date: 10/29/1996
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Bonnefous, Odile
• Primary Examiner(s): MANUEL, GEORGE C
• Application Number:
  US08/957,202
• Time in Patent Office: 662 Days
• Field of Search: 600/437, 600/440, 600/441, 600/450, 600/454, 600/456, 600/407
• US Class Current: 600/437
• CPC Class Codes: G01S 15/8979 Combined Doppler and pulse-echo imaging systems
• CPC Class Codes: G01S 7/52036 using analysis of echo signal for target characterisation
• CPC Class Codes: G01S 7/52073 Production of cursor lines, markers or indicia by electronic means

Abstract

A signal processing method includes the steps of construction (100), on the basis of sets of signals (S,X,Y,n) relating to an object (6) comprising moving parts, a sequence of graphic images with graphics (REF1 ,REF2; DP1, DP2) representing the parts (3a, 3b) of the object in motion, at a given scale, with a spatial and temporal marker; construction (30) of a sequence of intensity images I(X,Y,n)! corresponding to the graphic images; and encrustation (40, 140) of graphics of the graphic images in the corresponding intensity images. This method can be carried out by an ultrasonic echographic apparatus (1) comprising a diagnostic tool (100) and a display system for the construction of the appropriate image sequences.

Claims

1. A signal processing method comprising:

acquiring sets of data from echographic signals relating to an organ comprising moving parts, said sets being periodically acquired over a given time interval,

constructing on the basis of the sets of data a sequence of intensity images and corresponding sequences of processed images and

encrusting spatial graphics derived from the processed images onto the intensity images, the graphics comprising representations of locations of at least one or more moving parts of the organ, at a given spatial scale, and of a spatial and temporal reference marker.

2. A method as claimed in claim 1, wherein the graphics comprise representations of the at least one moving part(s) of the object in a reference position and/or of amplified movement of the moving part(s) at the given spatial scale.

3. A method as claimed in claim 1, in which the organ is a segment of an artery which is explored along its longitudinal axis, the moving part(s) of said organ, represented diagrammatically by one or more graphics, representing one or more internal parietal boundaries of said arterial segment.

4. A method as claimed in claim 3, wherein the step of constructing further comprises storage of the intensity images in a read/write memory, and wherein the step of encrusting further comprises:

correlation in order to produce a sequence of velocity images of the parietal boundaries of the arterial segment,

measurement of the amplitude of the echographic signals in order to supply a sequence of corresponding amplitude images,

post-processing including determination of the locations of the internal parietal boundaries in the amplitude images, transfer of the locations of said parietal boundaries to the corresponding velocity images, and construction of graphic lines on the basis of the locations of said parietal boundaries, and

encrusting said graphic lines in the intensity images stored in the read/write memory in order to supply a sequence of encrusted intensity images, including the graphic lines reproducing the motions of the internal parietal boundaries of said explored arterial segment, at parietal boundary points, and at instants of a cardiac cycle forming the time interval, in accordance with the predetermined spatial scale.

5. A method as claimed in claim 4, in wherein the post-processing further comprises:

determining displacements of the parietal boundaries on the basis of radial velocities of said parietal boundaries, including determination of a correction constant for the parietal boundary displacements, yielding a reference position corresponding to a starting instant of a cardiac cycle, representing said temporal marker, and

determining the location of the parietal boundaries, including digitization of the amplitude images, and determination of the boundary points as the transition points according to a threshold between the points inside the artery, in the digitized amplitude images, and other points.

6. The method of claim 4 wherein the graphics comprise representations of the at least one moving part of the object in a reference position and/or of amplified movement of the moving part(s) at the given spatial scale.

7. A method as claimed in claim 1 wherein the step of constructing further comprises storage of the intensity images in a read/write memory, and wherein the step of encrusting further comprises:

correlation in order to produce a sequence of velocity images of the at least one moving part of the organ,

measurement of the amplitude of the echographic signals in order to supply a sequence of corresponding amplitude images,

post-processing, including determination of the locations of the at least one moving part in the amplitude images, transfer of the locations to the corresponding velocity images, and construction of graphic lines on the basis of the locations, and

encrusting said graphic lines in the intensity images stored in the read/write memory in order to supply a sequence of encrusted intensity images, including the graphic lines reproducing the motions of the at least one moving part of the organ at the periodic instants of the time interval, in accordance with the predetermined spatial scale.

8. A method as claimed in claim 7 wherein the post-processing further comprises:

determining displacements of the of the at least one moving part on the basis of velocities of the at least one moving part, including determination of a correction constant for the displacements of the at least one moving part, yielding a reference position corresponding to a starting instant representing said temporal marker, and

determining the location of the at least one moving part, including digitization of the amplitude images, and determination of the boundary points as the transition points according to a threshold in the digitized amplitude images.

9. The method of claim 7 wherein the graphics comprise representations of the at least one moving part of the object in a reference position and/or of amplified movement of the moving part(s) at the given spatial scale.

10. The method of claim 1 wherein the sequences of processed images comprise a sequence of velocity images and a sequence of amplitude images.

11. An apparatus comprising:

an echographic apparatus for acquiring sets of data from echographic signals relating to an organ comprising moving parts, said sets being periodically acquired over a given time interval, and for constructing on the basis of the sets of data a sequence of intensity images,

a signal processing device for encrusting spatial graphics on corresponding intensity images, the encrusted graphics are derived from sequences of processed images based on the acquired sets of data and comprise representations of the evolution of motions of one or more moving parts of the organ, with an amplified spatial amplitude, over a cardiac cycle, and of a spatial and temporal reference marker, and

a system for displaying said sequence of encrusted intensity images.

12. An apparatus as claimed in claim 11, wherein the signal processing device further comprises means for the construction of graphics which diagrammatically represent one or more moving parts of the organ in a reference position and/or motion of the one or more involving parts at each instant, spatially amplified according to the predetermined spatial amplitude.

13. An apparatus as claimed in claim 11,

wherein the echographic apparatus further comprises a probe with ultrasonic transducers which provides, by exploration of said member, a series of standard echographic signals for construction of a sequence of intensity images of said organ and a read/write memory for storing the intensity images and

wherein the signal processing device further comprises:

means for carrying out a temporal correlation step and for supplying and storing a sequence of velocity images,

means for carrying out a step for measuring echographic amplitudes and for supplying and storing a corresponding sequence of amplitude images,

post-processing means which localizes, on the basis of the corresponding velocity and amplitude images, the velocities on the moving parts of the organ, determines the corresponding displacements and constructs graphic curves of these displacements, and

graphic encrustation means which encrusts said graphic curves on the images of the sequence stored in the image memory and, among these curves, the reference curves and the displacement curves.