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VR Haptics Paper Review

VR Haptics Paper Review

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Haptics paper Haptics paper Presentation Transcript

  • Haptics integration with 3D visualization techniques for dose planning in Stereo-tactic Radio surgery
    Pankaj Sharma(36921639)
    Proceedings of the Eighth International Conference on Information Visualization (IV’04) 1093-9547/04
    “Reference : Ida Olofsson ReachIn Technologies Sweden, Karljohan Linkoping Univeristy Sweden”
  • How it works?
    For executing Stereo-tactic Radio-surgery, surgeon uses two important things :
    • LeksellGammaKnife
    • Creation of iso-centers of the irradiation field
  • When treating small targets which are close to sensitive areas in the brain with ionizations radiation the commonly used procedure is Stereo tactic Radio-Surgery.
    Dose planning is the crucial step in the entire treatment process using ionizing radiation(Co-60 gamma photons).
  • About GammaKnife
    http://www.elekta.com/patient_international_gamma_knife_surgery.php
    Leksell Gamma Knife is the tool that allows the doctor to precisely pinpoint the tumor - is the special stereotactic head frame.
  • In imaging physics & radiation oncology, the isocenter is the point in space through which the central ray of the radiation beams pass
    • Radiation isocenter: is the point in space through which the central beam of radiation passes
    • Mechanical isocenter: is the point where optical beams intersect
    Iso-Center
  • In imaging physics & radiation oncology, the isocenter is the point in space through which the central ray of the radiation beams pass
    • Radiation isocenter: is the point in space through which the central beam of radiation passes
    • Mechanical isocenter: is the point where optical beams intersect
    Iso-Center
  • The dose planner task is to fill the target volume with irrdationiso-centers in such a way that sufficient level of irradiation is achieved.
  • Haptics Interaction with 3D visualisation
    Haptics integration combined with 3D visualization provide an efficient tool for dose planning. The major constituents for this approach are explained in the next slide :
    • Monitor integrated with a pair of LCD shutter glasses
    • Stereo display
    • 6 dof mouse
    • A desktop PHANTOM haptic device
  • Visualization
    Initial anatomical data is rendered from the patient scan.
    This permits the clinician to perform an initial planning of the positions and sizes of iso-centers.
    Target visualization
    Surrounding tissue visualization
  • Real time 3D visualization of both the tissue data & currently defined irradiation field.
    Interactive placement & subsequent adjustment of irradiation iso-centers using haptic device.
    Haptic interaction with the dose distribution generated from the previously placed iso-centers for getting optimal positions.
    Use of haptic 3D menu to provide an integrated planning.
    Haptics Interaction with 3D visualisation
  • The placement of iso-centers give rise to a dose distribution , the evolution of the dose distribution ,is continuously visualized through an iso-dose surface.
    Dose Visualization
  • Haptic interaction provides means of achieving full 3D local representation of these variations
    Haptic feedback present the dose distribution to the user
    It also provides feedback to guide user to place iso-centers at best Advantages position
    Haptic Feedback
  • A target guiding force feedback, not to force but to guide the user to put iso-centres in a position inside the target and not too close to the target wall.
    A dosage guiding force feedback that leads the user away from areas where higher dosage has already been applied. This helps to find the potential minima of the field inside the target volume.
    Haptic Feedback Criteria
  • Thank you