Classifications

• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
  • G06T13/00—Animation
  • G06T13/20—3D [Three Dimensional] animation
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
  • G06T19/00—Manipulating 3D models or images for computer graphics
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
  • G06T2210/00—Indexing scheme for image generation or computer graphics
  • G06T2210/41—Medical

Definitions

• the present invention relates to an imaging system for use in monitoring a structure having a configuration which changes with time, such as for example a functioning heart.
• LV Left Ventricle
• Imaging technology enables static volume (3D) images and dynamic volume (4D) images to be generated.
• Cardiac imaging systems such as Ultrasound, CT or MRI Imaging have been developed to image the LV during the cardiac cycle.
• a specific ultrasound imaging technique is disclosed in WO2004003851.
• the invention provides an imaging system for displaying image data representative of a structure of temporally changing configuration, the system comprising display rendering means for processing data representative of the changing configuration of the structure and rendering a display comprising a reference image of the structure in a predetermined configuration and superposing with the reference image a changing image of the structure which changes in configuration with respect to time.
• the system includes data acquisition means for acquiring the data representative of the structure configuration as it varies with time.
• the system may include ultrasound imaging apparatus for acquiring the data.
• the acquisition means preferably acquires 3D volume, data for processing.
• the invention provides a method of rendering image data representative of a structure of temporally changing configuration, the method comprising processing data representative of the changing configuration of the structure and rendering a display comprising a reference image of the structure in a predetermined configuration and superposing with the reference image a changing image of the structure which changes in configuration with respect to time.
• the reference image is preferably a static image of the structure, remaining static whilst the configuration of the changing image changes with respect to time.
• the system preferably comprises a 3D imaging system and the reference image and/or the changing image is beneficially a 3D rendered image.
• the temporally changing structure typically changes in configuration cyclically and the changing image beneficially represents the cyclically changing 3D volume of the structure.
• the reference image represents the maximum volume of the structure.
• the structure monitored may comprise the Left Ventricle (LV) of a heart, in which case the reference image is beneficially representative of the LV End Diastole (ED).
• LV Left Ventricle
• ED LV End Diastole
• the invention provides a method of imaging the Left Ventricle (LV) of a heart comprising rendering a display comprising a reference image of the LV in End Diastole and superposing with the reference image a changing image of the LV through the heart beating cycle.
• LV Left Ventricle
• the invention provides a computer program product comprising a set of instructions enabling performance of the method.
• - Figure 1 is a schematic flowchart representing operation of a system in accordance with the present invention
• - Figure 2 is an ultrasound image of the LV of a patient's heart showing the computer generated border
• Figure 3 shows a series of 3D mesh frames of the LV at different time periods within the cardiac cycle, superposed with the 3D ED mesh
• Figure 4 is a schematic representation of the data acquisition system.
• figure 1 shows a flowchart of steps taken in a technique according to the invention to generate a visualisation of the LV beat.
• the LV of a patient is initially monitored (block 100) using conventional monitoring techniques such as ultrasound imaging and or ECG, to ascertain the ED (end-diastole) phase (block 110) of the cardiac cycle.
• conventional monitoring techniques such as ultrasound imaging and or ECG, to ascertain the ED (end-diastole) phase (block 110) of the cardiac cycle.
• a 3D echocardiography system could be utilised.
• the system having means for acquiring a digital image sequence, and is associated to a digital processing system for processing the acquired 3D volume data.
• the examination system 550 shown in figure 4 comprises means for providing image data to the processing system which has at least one output 506 to provide image data to display and/or storage means 530,540.
• the display and storage means may respectively be the screen and memory of a workstation 510.
• the workstation 510 may also comprise a keyboard 531 and a mouse 532.
• the image processing system 520 may be a suitably programmed computer of a workstation 510, or a special purpose processor having circuit means such as filters, logic operators, memories that are arranged to perform the functions of the method steps according to the invention.
• the processing system 520 may use a computer program product having program instructions to be executed by the computing means of the processing system 520 in order to carry out the method steps.
• the 3D image data corresponding to the LV at the ED phase of the cardiac cycle is processed to generate a computed border 400 of the LV, as seen in figure 2.
• a computer algorithm then prompts a user to select a series of points (block 120) within the computer generated border and then uses the information to generate a 3D mesh (block 130) that completely covers the area of the image within the border and thus specifies the surface of the LV.
• This segmentation technique is related to the Finite Element Method, which is one of several standard mathematical techniques used in the analysis of image data). In this manner, a reference mesh is obtained for the ED phase of the LV during the cardiac cycle. If necessary the computer generated mesh can be modified at this stage (block 140).
• the ES (End-Systole) (block 200) phase of the LV is then ascertained in a similar manner with the border of the LV again being determined (block 210) and the corresponding mesh generated (block 230) through the user selecting a series of points (block 220). Again this mesh can be modified if necessary (block 240).
• the border of the LV is determined from a sequence of 3D images within the cardiac cycle at selected time intervals (block 300) from ED to ES (block 310), and the corresponding mesh is generated automatically (block 320), which if necessary can be modified (block 330).
• the system then renders an image display having a reference image of the structure in a preselected configuration (the ED phase of the LV), superposed with the changing image of the structure as it changes with respect to time.
• the 3D LV border can be displayed as a live beating object and when displayed within the ED reference mesh, clear departures can be seen between the current frame and the reference frame 500 during the cardiac cycle (figure 3). Furthermore, the superposition of meshes also highlights any global movement the LV may undertake during for example, respiration.
• Such visualisation images provide a collective account of the motion of the surface of the LV as it changes with respect to time and therefore, in contrast to the prior art in which only one frame time is shown, the visualisation illustrates the changes of the LV border over the whole heart cycle.
• MRI Magnetic Resonance Imaging
• CT Computed Tomography

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Theoretical Computer Science (AREA)
• Computer Graphics (AREA)
• Computer Hardware Design (AREA)
• General Engineering & Computer Science (AREA)
• Software Systems (AREA)
• Ultra Sonic Daignosis Equipment (AREA)
• Magnetic Resonance Imaging Apparatus (AREA)
• Image Processing (AREA)
• Apparatus For Radiation Diagnosis (AREA)

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• 2005
  • 2005-08-26 WO PCT/IB2005/052803 patent/WO2006025005A2/en active Application Filing
  • 2005-08-26 JP JP2007529103A patent/JP2008511368A/ja active Pending
  • 2005-08-26 EP EP05776677A patent/EP1794719A2/en not_active Withdrawn

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