Dr. Bernhard Geiger Profile

Dr. Bernhard Geiger

at Siemens Corp Corporate Technology

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Author

Publications (8)

Proceedings Article | 13 March 2013 Paper

Pulmonary lobe segmentation using the thin plate spline (TPS) with the help of the fissure localization areas

Benjamin Odry, Pauline Steininger, Li Zhang, Atilla Kiraly, Alexander Mahnke, Sandra Sudarsky, Carol Novak, Bernhard Geiger, Shuping Qing, Hendrik Ditt

Proceedings Volume 8669, 86690X (2013) https://doi.org/10.1117/12.2007098

KEYWORDS: Lung, Image segmentation, Computed tomography, Detection and tracking algorithms, Plutonium, Image processing, Ions, Picosecond phenomena, Lithium, Scanners

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Proceedings Article | 17 February 2012 Paper

A system for saccular intracranial aneurysm analysis and virtual stent planning

Sajjad Baloch, Sandra Sudarsky, Ying Zhu, Ashraf Mohamed, Berhard Geiger, Komal Dutta, Durga Namburu, Puthenveettil Nias, Gary Martucci, Thomas Redel

Proceedings Volume 8316, 83161F (2012) https://doi.org/10.1117/12.911785

KEYWORDS: Neck, Image segmentation, Reconstruction algorithms, 3D image reconstruction, Transform theory, Virtual reality, Feature extraction, Digital imaging, Europium, Algorithm development

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Proceedings Article | 10 May 2007 Paper

Slice-based guided navigation for colonography

Sandra Sudarsky, Bernhard Geiger

Proceedings Volume 6511, 65110T (2007) https://doi.org/10.1117/12.709678

KEYWORDS: Colon, Inspection, Visualization, Virtual colonoscopy, Image segmentation, 3D displays, Rectum, 3D image processing, 3D vision, Computed tomography

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Proceedings Article | 14 April 2005 Paper

Virtual bronchoscopy of peripheral nodules using arteries as surrogate pathways

Bernhard Geiger, Atilla Kiraly, David Naidich, Carol Novak

Proceedings Volume 5746, (2005) https://doi.org/10.1117/12.595734

KEYWORDS: Arteries, Bronchoscopy, Lung, Image segmentation, Computed tomography, Endoscopy, Visualization, Scanners, Biopsy, Optical inspection

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Proceedings Article | 14 April 2005 Paper

Virtual bronchoscopy guidance system for transbronchial needle aspiration

Bernhard Geiger, Guido Weiner, Karsten Schulze, Johannes Bilger, Patricia Krebs, Karl-Juergen Wolf, Thomas Albrecht

Proceedings Volume 5746, (2005) https://doi.org/10.1117/12.595869

KEYWORDS: Bronchoscopy, Endoscopes, 3D acquisition, Computed tomography, Biopsy, Endoscopy, 3D vision, 3D displays, Translucency, Distance measurement

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Proceedings Article | 28 June 2001 Paper

Methodology to measure fundamental performance parameters of x-ray detectors

Falko Busse, Walter Ruetten, Hans-Aloys Wischmann, Bernhard Geiger, Martin Spahn, Raoul Bastiaens, Thierry Ducourant

Proceedings Volume 4320, (2001) https://doi.org/10.1117/12.430859

KEYWORDS: Sensors, Modulation transfer functions, Image intensifiers, X-ray detectors, Signal to noise ratio, X-rays, CCD cameras, Interference (communication), Imaging systems, Spatial frequencies

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Proceedings Article | 28 May 2001 Paper

Augmented-reality visualization of brain structures with stereo and kinetic depth cues: system description and initial evaluation with head phantom

Calvin Maurer, Frank Sauer, Bo Hu, Benedicte Bascle, Bernhard Geiger, Fabian Wenzel, Filippo Recchi, Torsten Rohlfing, Christopher Brown, Robert Bakos, Robert Maciunas, Ali Bani-Hashemi

Proceedings Volume 4319, (2001) https://doi.org/10.1117/12.428086

KEYWORDS: Cameras, Head, Video, Visualization, Computed tomography, Head-mounted displays, Brain, Image segmentation, Surgery, Navigation systems

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We are developing a video see-through head-mounted display (HMD) augmented reality (AR) system for image-guided neurosurgical planning and navigation. The surgeon wears a HMD that presents him with the augmented stereo view. The HMD is custom fitted with two miniature color video cameras that capture a stereo view of the real-world scene. We are concentrating specifically at this point on cranial neurosurgery, so the images will be of the patient's head. A third video camera, operating in the near infrared, is also attached to the HMD and is used for head tracking. The pose (i.e., position and orientation) of the HMD is used to determine where to overlay anatomic structures segmented from preoperative tomographic images (e.g., CT, MR) on the intraoperative video images. Two SGI 540 Visual Workstation computers process the three video streams and render the augmented stereo views for display on the HMD. The AR system operates in real time at 30 frames/sec with a temporal latency of about three frames (100 ms) and zero relative lag between the virtual objects and the real-world scene. For an initial evaluation of the system, we created AR images using a head phantom with actual internal anatomic structures (segmented from CT and MR scans of a patient) realistically positioned inside the phantom. When using shaded renderings, many users had difficulty appreciating overlaid brain structures as being inside the head. When using wire frames, and texture-mapped dot patterns, most users correctly visualized brain anatomy as being internal and could generally appreciate spatial relationships among various objects. The 3D perception of these structures is based on both stereoscopic depth cues and kinetic depth cues, with the user looking at the head phantom from varying positions. The perception of the augmented visualization is natural and convincing. The brain structures appear rigidly anchored in the head, manifesting little or no apparent swimming or jitter. The initial evaluation of the system is encouraging, and we believe that AR visualization might become an important tool for image-guided neurosurgical planning and navigation.

Proceedings Article | 29 July 1993 Paper

Three-dimensional reconstruction of complex shapes based on the Delaunay triangulation

Jean-Daniel Boissonnat, Bernhard Geiger

Proceedings Volume 1905, (1993) https://doi.org/10.1117/12.148710

KEYWORDS: 3D modeling, Image resolution, Reconstruction algorithms, Medical imaging, 3D image processing, 3D metrology, Tomography, Surgery, Radiotherapy, Scanners

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