LejingWang

Chair for Computer Aided Medical Procedures & Augmented Reality
Lehrstuhl für Informatikanwendungen in der Medizin & Augmented Reality

Lejing Wang

  • Name: Lejing Wang (中文:王乐晶)
  • Email: wangle@in.tum.de
  • Phone: +49 (89) 289-17079
  • Room: MI 03.13.041

Research Projects

Camera Augmented Mobile C-arm

Camera Augmented Mobile C-arm

Mobile C-arms are an everyday tool to acquire X-ray images in the operating room during surgery. The Camera Augmented Mobile C-arm (CamC) system augments a regular mobile C-arm by a video camera for X-ray and video image overlay. Thanks to the mirror construction and one time calibration of the device, the acquired X-ray images are co-registered with the video images without any further calibration or registration during the intervention. The CamC system can support a wide range of potential clinical applications, such as needle guidance, interlocking of intramedullary nails, and pedicle screw placement.

Videos

Magic X-ray Stitching (Mosaicing)

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Visual Marker Based UI for the CamC system

A prototype for next generation of CAMC user interface - Visual Marker Based Advanced UI. In the prototype, we show that the X-ray transparency can be adjusted by simply moving a finger through a marker-bar

Talks

  • "Long Bone X-ray Image Stitching using C-arm Motion Estimation" at BILDVERARBEITUNG FÜR DIE MEDIZIN (BVM 2009), in Heidelberg, Germany, 2009.
  • "Camera Augmented Mobile C-arm: Towards Real Patient Study" at BILDVERARBEITUNG FÜR DIE MEDIZIN (BVM 2009), in Heidelberg, Germany, 2009.
  • "Parallx-Free Long Bone X-ray Image Stitching" at MICCAI 2009, the 12th International Conference on Medical Image Computing and Computer Assisted Intervention in London, UK. Slides
  • "First Animal Cadaver Study for Interlocking of Intramedullary Nails under Camera Augmented Mobile C-arm A Surgical Workflow Based Preclinical Evaluation" at IPCAI 2010, the 1st International Conference on Information Processing in Computer-Assisted Interventions, is held on June 23 2010, in Geneva, Switzerland. Slides
  • "Modeling Kinematics of Mobile C-arm and Operating Table as an Integrated Six Degrees of Freedom Imaging System " at the 5th International Workshop on Medical Imaging and Augmented Reality (MIAR 2010), Beijing, China, 2010. Slides

Awards

MICCAI 2009 Young Scientist Award. Please see our news

2009 Chinese Government Award for Outstanding Self-financed Students Abroad .

Science4Life-Logo Science4Life Business Plan Competition 2011
Our team SmartSurgicalSolutions was one of ten awarded teams at the Science4Life business plan competition
MBPW-Logo Munich Business Plan Competition 2011
for the business plan on AXSight together with the other members of SmartSurgicalSolutions: Lejing Wang, Dr. med. Simon Weidert and Prof. Nassir Navab

Theses, SEPs, and IDPs under my (Co-)Supervision

  • (open) Just come by to talk about further options for a project that comes up to your expectations.
  • Available:

    • X-ray Stitching Evaluation Based on DDRs: Towards Clinical Trial (DA/MA/BA)
      After extensive preclinical testing finally CAMC has been moved into the Operation Room of Innenstadtklinikum at Nußbaumstraße. Many Patients were treated successfully with CAMC-navigation support (see CAMCInOR). The clinical investigation also includes X-ray image stitching. X-ray image stitching is a way to create panoramic X-ray images that have exceptionally wide fields of view. Panoramic X-ray images are very helpful for long bone fracture reduction surgery since they can show the whole bone structure with its entire mechanical axis, in a single image. There are many error sources in X-ray image stitching based on CAMC. Before the real clinical study, evaluating all factors to X-ray stitching is necessary. This can give an overview of potential error sources and their effects on X-ray stitching, which will be used as guidance for applying our X-ray stitching in real clinical cases. Moreover, the obtained results can give us the hints to improve the X-ray image stitching methods based on CAMC. For the evaluation, we simulate the C-arm motion based on the kinematic model of the CAMC system, and then generate artificial fluoroscopy from real X-ray CT data. Generated artificial fluoroscopy will be used for X-ray image stitching.
    • 2D/3D Registration of CT to an X-ray Mosaic (DA/MA/BA)
      During long bone fracture reduction surgery, one X-ray image mosaic is created by stitching several individual fluoroscopy images in order to show the entire bone structure of interest to the surgeons. Preoperative assessment and decision making is usually based on standard 2D X-rays of the injured limb using a planning software. The system allows lines to be drawn by the surgeon and merged directly on the X-ray. While navigating the reduction of the fracture intraoperatively, these lines provide graphic and numerical descriptions of the reduction. Surprisingly, 3D information from computed tomography (CT) is not used intraoperatively in order to help guide surgery. The aim of this project is to develop a new clinical protocol involving the 2D/3D registration of preoperative CT data to the individual X-ray images and the final X-ray mosaic. We hypothesize that the creation of multiple DRRs from CT fused together with the X-rays will help guide proper positioning and alignment of the patient’s injured bone. As an additional constraint to correct re-alignment of bone, we also incorporate the pre-planning lines drawn by the clinicians prior to intervention. (requirement: C++ knowledge).

    Current:

    Finished:

    Publications

    2012
    X. Chen, L. Wang, P. Fallavollita, N. Navab
    Error analysis of the x-ray projection geometry of camera-augmented mobile C-arm
    SPIE Medical Imaging, San Diego, California, USA, February 2012 (bib)
    L. Wang, P. Fallavollita, R. Zou, X. Chen, S. Weidert, N. Navab
    Closed-form inverse kinematics for interventional C-arm X-ray imaging with six degrees of freedom: modeling and application
    IEEE Transactions on Medical Imaging (to appear). (bib)
    2011
    S. Demirci, A. Bigdelou, L. Wang, C. Wachinger, M. Baust, R. Tibrewal, R. Ghotbi, H-H. Eckstein, N. Navab
    3D Stent Recovery from One X-ray Projection
    14th International Conference on Medical Image Computing and Computer Assisted Intervention (MICCAI), Toronto (CA), September 18-22, 2011 (bib)
    M. Wieczorek, A. Aichert, P. Fallavollita, O. Kutter, A. Ahmadi, L. Wang, N. Navab
    Interactive 3D visualization of a single-view X-Ray image
    Proceedings of Medical Image Computing and Computer-Assisted Intervention (MICCAI 2011), Toronto, Canada, September 2011. (bib)
    S. Weidert, L. Wang, P. Thaller, J. Landes, A. Brand, N. Navab, E. Euler
    X-ray Stitching for Intra-operative Mechanical Axis Determination of the Lower Extremity
    the 11th Annual Meeting of the International Society for Computer Assisted Orthopaedic Surgery, London, UK, June 15-19 2011 (bib)
    L. Wang, R. Zou, S. Weidert, J. Landes, E. Euler, D. Burschka, N. Navab
    Closed-form inverse kinematics for intra-operative mobile C-arm positioning with six degrees of freedom
    SPIE Medical Imaging, Lake Buena Vista (Orlando), Florida, USA, February 2011 (bib)
    2010
    L. Wang, M. Springer, H. Heibel, N. Navab
    Floyd-Warshall All-Pair Shortest Path for Accurate Multi-Marker Calibration
    The 9th IEEE and ACM International Symposium on Mixed and Augmented Reality, Seoul, Korea, Oct. 13 - 16, 2010. (bib)
    L. Wang, R. Zou, S. Weidert, J. Landes, E. Euler, D. Burschka, N. Navab
    Modeling Kinematics of Mobile C-arm and Operating Table as an Integrated Six Degrees of Freedom Imaging System
    The 5th International Workshop on Medical Imaging and Augmented Reality, MIAR 2010, Beijing, China, September 19-20, 2010 (bib)
    L. Wang, J. Traub, S. Weidert, S.M. Heining, E. Euler, N. Navab
    Parallax-Free Intra-Operative X-ray Image Stitching
    the MICCAI 2009 special issue of the Journal Medical Image Analysis (bib)
    L. Wang, J. Landes, S. Weidert, T. Blum, A. von der Heide, E. Euler, N. Navab
    First Animal Cadaver Study for Interlocking of Intramedullary Nails under Camera Augmented Mobile C-arm A Surgical Workflow Based Preclinical Evaluation
    the 1st International Conference on Information Processing in Computer-Assisted Interventions (IPCAI), Switzerland, June 23 2010. The original publication is available online at www.springerlink.com. (bib)
    S. Weidert, L. Wang, J. Landes, A. von der Heide, N. Navab, E. Euler
    First Surgical Procedures under Camera-Augmented Mobile C-arm (CamC?) guidance
    The 3rd Hamlyn Symposium for Medical Robotics ,London, UK, May 25 2010 (bib)
    P. Dressel, L. Wang, O. Kutter, J. Traub, S.M. Heining, N. Navab
    Intraoperative positioning of mobile C-arms using artificial fluoroscopy
    SPIE Medical Imaging, San Diego, California, USA, February 2010 (bib)
    2009
    L. Wang, J. Traub, S. Weidert, S.M. Heining, E. Euler, N. Navab
    Parallax-free Long Bone X-ray Image Stitching
    Medical Image Computing and Computer-Assisted Intervention (MICCAI), London, UK, September 20-24 2009 (bib)
    L. Wang, J. Traub, S.M. Heining, S. Benhimane, R. Graumann, E. Euler, N. Navab
    Long Bone X-ray Image Stitching using C-arm Motion Estimation
    Proceedings of Bildverarbeitung fuer die Medizin (BVM 2009), Heidelberg, Germany, March 22-24 2009 (bib)
    L. Wang, S. Weidert, J. Traub, S.M. Heining, C. Riquarts, E. Euler, N. Navab
    Camera Augmented Mobile C-arm: Towards Real Patient Study
    Proceedings of Bildverarbeitung fuer die Medizin (BVM 2009), Heidelberg, Germany, March 22-24 2009 (bib)
    2008
    J. Traub, A. Ahmadi, N. Padoy, L. Wang, S.M. Heining, E. Euler, P. Jannin, N. Navab
    Workflow Based Assessment of the Camera Augmented Mobile C-arm System
    International Workshop on Augmented Reality environments for Medical Imaging and Computer-aided Surgery (AMI-ARCS 2008), New York, NY, USA, September 2008 (bib)
    L. Wang, J. Traub, S.M. Heining, S. Benhimane, R. Graumann, E. Euler, N. Navab
    Long Bone X-ray Image Stitching Using Camera Augmented Mobile C-arm
    Medical Image Computing and Computer-Assisted Intervention, MICCAI, 2008, New York, USA, September 6-10 2008 (bib)

    Teaching


    Activated July 04, 2011


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    Title: Master
    Firstname: Lejing
    Middlename:  
    Lastname: Wang
    Picture: le.png
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    Nationality: China
    Languages: English, Chinese
    Groups: Medical Imaging, Computer-Aided Surgery, Medical Augmented Reality
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    Position: Scientific Staff
    Status: Active
    Emailbefore: wangle
    Emailafter: in.tum.de
    Room: MI 03.13.041
    Telephone: +49 89 289 17079
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