Dr. Tobias J. Ortmaier Profile

Dr. Tobias J. Ortmaier

Researcher at Leibniz Univ Hannover

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 19 July 2019 Paper

Semantic denoising autoencoders for retinal optical coherence tomography

Max-Heinrich Laves, Sontje Ihler, Lüder Alexander Kahrs, Tobias Ortmaier

Proceedings Volume 11078, 1107818 (2019) https://doi.org/10.1117/12.2526936

KEYWORDS: Denoising, Optical coherence tomography, Signal to noise ratio, Image classification, Speckle, Medical imaging, Wavelets, Medical diagnostics, Ophthalmology, Classification systems

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Proceedings Article | 8 March 2019 Paper

Endoscopic guidance system for stimulation of the laryngeal adductor reflex by droplet impact

Jacob Friedemann Fast, Adrian Karl Rüppel, Caroline Bärhold, Michael Jungheim, Tobias Ortmaier, Martin Ptok, Lüder Alexander Kahrs

Proceedings Volume 10951, 109510M (2019) https://doi.org/10.1117/12.2512852

KEYWORDS: Endoscopy, Endoscopes, Visualization, Image visualization, Imaging systems, High speed cameras, Algorithm development, Computer aided diagnosis and therapy, Medical diagnostic instruments, Non-invasive medical diagnostics, Optical diagnostics, Stereoscopy

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Proceedings Article | 8 March 2019 Presentation + Paper

Deep-learning-based 2.5D flow field estimation for maximum intensity projections of 4D optical coherence tomography

Max-Heinrich Laves, Sontje Ihler, Lüder Kahrs, Tobias Ortmaier

Proceedings Volume 10951, 109510R (2019) https://doi.org/10.1117/12.2512952

KEYWORDS: Optical coherence tomography, Bone, Laser ablation, Optical flow, Convolutional neural networks, Laser safety

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Proceedings Article | 28 May 2018 Paper

User evaluation study on illumination requirements to design an augmented reality projector for open liver surgery

Shivaraman Ilango, Marvin Knöchelmann, Lüder Alexander Kahrs, Alexander Wolf, Tobias Ortmaier, Roland Lachmayer

Proceedings Volume 10693, 106930R (2018) https://doi.org/10.1117/12.2309667

KEYWORDS: Projection systems, Surgery, Visibility, Liver, Augmented reality, Visualization, Image resolution, Statistical analysis, Tissues

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Proceedings Article | 3 March 2017 Presentation + Paper

Feature tracking for automated volume of interest stabilization on 4D-OCT images

Max-Heinrich Laves, Andreas Schoob, Lüder Kahrs, Tom Pfeiffer, Robert Huber, Tobias Ortmaier

Proceedings Volume 10135, 101350W (2017) https://doi.org/10.1117/12.2255090

KEYWORDS: Optical coherence tomography, Medical imaging, Optical tracking, Image processing, Automatic tracking, Image analysis, Tissues, 3D image processing, Visualization, Detection and tracking algorithms, Image acquisition, Sensors

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Proceedings Article | 3 March 2017 Presentation + Paper

Panorama imaging for image-to-physical registration of narrow drill holes inside spongy bones

Jan Bergmeier, Jacob Friedemann Fast, Tobias Ortmaier, Lüder Alexander Kahrs

Proceedings Volume 10135, 1013507 (2017) https://doi.org/10.1117/12.2254417

KEYWORDS: Imaging systems, Mirrors, Optics manufacturing, Image processing, Image registration, Panoramic photography, Endoscopy, Bone, Endoscopes, Computed tomography, Cones, Data acquisition, Software development, Image processing software

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Image-to-physical registration based on volumetric data like computed tomography on the one side and intraoperative endoscopic images on the other side is an important method for various surgical applications. In this contribution, we present methods to generate panoramic views from endoscopic recordings for image-to-physical registration of narrow drill holes inside spongy bone. One core application is the registration of drill poses inside the mastoid during minimally invasive cochlear implantations. Besides the development of image processing software for registration, investigations are performed on a miniaturized optical system, achieving 360° radial imaging with one shot by extending a conventional, small, rigid, rod lens endoscope. A reflective cone geometry is used to deflect radially incoming light rays into the endoscope optics. Therefore, a cone mirror is mounted in front of a conventional 0° endoscope. Furthermore, panoramic images of inner drill hole surfaces in artificial bone material are created. Prior to drilling, cone beam computed tomography data is acquired from this artificial bone and simulated endoscopic views are generated from this data. A qualitative and quantitative image comparison of resulting views in terms of image-to-image registration is performed. First results show that downsizing of panoramic optics to a diameter of 3mm is possible. Conventional rigid rod lens endoscopes can be extended to produce suitable panoramic one-shot image data. Using unrolling and stitching methods, images of the inner drill hole surface similar to computed tomography image data of the same surface were created. Registration is performed on ten perturbations of the search space and results in target registration errors of (0:487 ± 0:438)mm at the entry point and (0:957 ± 0:948)mm at the exit as well as an angular error of (1:763 ± 1:536)°. The results show suitability of this image data for image-to-image registration. Analysis of the error components in different directions reveals a strong influence of the pattern structure, meaning higher diversity results into smaller errors.

Proceedings Article | 7 March 2016 Paper

Endoluminal non-contact soft tissue ablation using fiber-based Er:YAG laser delivery

Dennis Kundrat, Alexander Fuchs, Andreas Schoob, Lüder Kahrs, Tobias Ortmaier

Proceedings Volume 9702, 97020E (2016) https://doi.org/10.1117/12.2211796

KEYWORDS: Laser tissue interaction, Laser ablation, Fiber lasers, Er:YAG lasers, Laser therapeutics, Optical fibers, Laser applications, Laser vision correction, Laser optics, Absorption, Tissues, Surgery, Laser processing, Tissue optics, Lenses

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Proceedings Article | 15 July 2015 Paper

Fast and automatic depth control of iterative bone ablation based on optical coherence tomography data

Alexander Fuchs, Steffen Pengel, Jan Bergmeier, Lüder Kahrs, Tobias Ortmaier

Proceedings Volume 9542, 95420P (2015) https://doi.org/10.1117/12.2183695

KEYWORDS: Laser ablation, Optical coherence tomography, Bone, Er:YAG lasers, Laser tissue interaction, Tissues, Natural surfaces, Laser cutting, Image processing, Detection and tracking algorithms

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Proceedings Article | 20 March 2015 Paper

Cochlear shape description and analyzing via medial models

Johannes Gaa, Lüder Kahrs, Samuel Müller, Omid Majdani, Tobias Ortmaier

Proceedings Volume 9413, 941345 (2015) https://doi.org/10.1117/12.2082033

KEYWORDS: Chemical species, Data modeling, Image segmentation, Shape analysis, Computed tomography, Ear, Statistical analysis, Statistical modeling, 3D modeling, Principal component analysis

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Proceedings Article | 18 March 2015 Paper

Methods for intraoperative, sterile pose-setting of patient-specific microstereotactic frames

Benjamin Vollmann, Samuel Müller, Dennis Kundrat, Tobias Ortmaier, Lüder Kahrs

Proceedings Volume 9415, 94150M (2015) https://doi.org/10.1117/12.2082066

KEYWORDS: Cements, Bone, Computer aided design, Rapid manufacturing, Silicon, Mechatronics, Manufacturing, Brain stimulation, Skull, Fluoroscopy

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Proceedings Article | 18 March 2015 Paper

Comparison of tablet-based strategies for incision planning in laser microsurgery

Andreas Schoob, Stefan Lekon, Dennis Kundrat, Lüder Kahrs, Leonardo Mattos, Tobias Ortmaier

Proceedings Volume 9415, 94150J (2015) https://doi.org/10.1117/12.2081032

KEYWORDS: Visualization, Tablets, Laser ablation, Laser microsurgery, Laser therapeutics, Cameras, Laser tissue interaction, Natural surfaces, Stereoscopic cameras, Human-machine interfaces

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Proceedings Article | 18 March 2015 Paper

Methods for a fusion of optical coherence tomography and stereo camera image data

Jan Bergmeier, Dennis Kundrat, Andreas Schoob, Lüder Kahrs, Tobias Ortmaier

Proceedings Volume 9415, 94151C (2015) https://doi.org/10.1117/12.2082511

KEYWORDS: Optical coherence tomography, Stereoscopic cameras, Image segmentation, Cameras, Clouds, Image registration, Image fusion, Visualization, Augmented reality, 3D image processing

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Proceedings Article | 21 March 2014 Paper

Normal distributions transform in multi-modal image registration of optical coherence tomography and computed tomography datasets

Jesús Díaz Díaz, Mauro Riva, Omid Majdani, Tobias Ortmaier

Proceedings Volume 9034, 90343L (2014) https://doi.org/10.1117/12.2043623

KEYWORDS: Image registration, Optical coherence tomography, Computed tomography, Nondestructive evaluation, Statistical analysis, Bone, Optimization (mathematics), Navigation systems, Genetic algorithms, Surgery

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Proceedings Article | 12 March 2014 Paper

Localization accuracy of sphere fiducials in computed tomography images

Jan-Philipp Kobler, Jesus Díaz Díaz, J. Michael Fitzpatrick, G. Jakob Lexow, Omid Majdani, Tobias Ortmaier

Proceedings Volume 9036, 90360Z (2014) https://doi.org/10.1117/12.2043472

KEYWORDS: Optical spheres, Titanium, Computed tomography, Bone, Robots, Spherical lenses, Image registration, Head, Skull, Ferromagnetics

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Proceedings Article | 4 March 2014 Paper

Accuracy of optical navigation systems for automatic head surgery: optical tracking versus optical coherence tomography

Jesús Díaz Díaz, Mauro Riva, Omid Majdani, Tobias Ortmaier

Proceedings Volume 8926, 89262F (2014) https://doi.org/10.1117/12.2040263

KEYWORDS: Optical coherence tomography, Navigation systems, Laser cutting, Surgery, Optical tracking, Laser ablation, Imaging systems, Optical navigation, Head, Laser processing

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Proceedings Article | 13 March 2013 Paper

A one step vs. a multi step geometric calibration of an optical coherence tomography

Jesús Díaz Díaz, Maik Rahlves, Omid Majdani, Eduard Reithmeier, Tobias Ortmaier

Proceedings Volume 8573, 85730D (2013) https://doi.org/10.1117/12.2005264

KEYWORDS: Optical coherence tomography, Calibration, Distortion, Mirrors, Data modeling, Geometrical optics, 3D modeling, Mathematical modeling, 3D metrology, Surgery

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Proceedings Article | 20 November 2012 Paper

Towards a one step geometric calibration of an optical coherence tomography

Jesús Díaz Díaz, Maik Rahlves, Omid Majdani, Eduard Reithmeier, Tobias Ortmaier

Proceedings Volume 8563, 85630J (2012) https://doi.org/10.1117/12.999276

KEYWORDS: Optical coherence tomography, Calibration, Distortion, Data modeling, Mirrors, 3D modeling, 3D metrology, Surgery, Electroluminescent displays, 3D image processing

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SPIE Journal Paper | 1 September 2011 Open Access

Rotationally acquired four-dimensional optical coherence tomography of embryonic chick hearts using retrospective gating on the common central A-scan

Christoph Happel, Talât Yelbuz, Jan Thommes, Tobias Ortmaier, Bodo Heimann, Lars Thrane, Jörg Männer

JBO, Vol. 16, Issue 09, 096007, (September 2011) https://doi.org/10.1117/12.10.1117/1.3622491

KEYWORDS: Heart, Optical coherence tomography, Video, Spatial light modulators, Image acquisition, Data acquisition, Visualization, 3D acquisition, 3D image processing, Imaging systems

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Proceedings Article | 12 April 2005 Paper

Robust real-time instrument tracking in ultrasound images

Tobias Ortmaier, Marie-Aude Vitrani, Guillaume Morel, Samuel Pinault

Proceedings Volume 5750, (2005) https://doi.org/10.1117/12.594109

KEYWORDS: Surgery, Ultrasonography, Detection and tracking algorithms, Visualization, Image processing, Robotic surgery, Digital filtering, Polyurethane, Algorithm development, Image quality

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Proceedings Article | 17 May 2002 Paper

Tracking local motion on the beating heart

Martin Groeger, Tobias Ortmaier, Wolfgang Sepp, Gerd Hirzinger

Proceedings Volume 4681, (2002) https://doi.org/10.1117/12.466926

KEYWORDS: Heart, Surgery, Motion models, Affine motion model, Optical tracking, Optical inspection, Robotic surgery, Video, Specular reflections, Robotics

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Showing 5 of 20 publications

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