ResearchIssueReconstruction

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

Research in Reconstruction

Table of Content

Contact Person and Group Coordination

Tobias Lasser
Nassir Navab




Research Projects in Reconstruction

Estimation of Flow Parameters from X-ray Data

Estimation of Flow Parameters from X-ray Data

This project focuses on the quantification of blood flow based on 2D and 3D angiographic X-ray image data, which is of particular interest during minimally invasive interventional procedures such as recanalizations of stenotic vessels and embolizations of arteries that feed tumors or vascular malformations in the patient's brain, for example. Our projects cover the evaluation of model-based approaches involving CFD (computational fluid dynamics) simulations as well as methods that aim at estimating the optical flow in the images and deriving quantitative blood flow information from these results.
patient-Specific Translational research on Atherosclerosis and Diagnosis (STAnD)

patient-Specific Translational research on Atherosclerosis and Diagnosis (STAnD)

Multispectral Reconstruction

Multispectral Reconstruction

Multispectral imaging is an emerging modality for use in dermatological diagnosis which has the potential to offer quantitative measurements of the skin tissue, thus providing a more accurate diagnosis tool for a wide range of afflictions. Multispectral images are sequences of images taken at different wavelengths and due to their improved spectral discrimination, can offer insight into the distribution of collagen, melanin, and hemoglobin within skin lesions.
The main motivation of this project is to provide dermatologists with a multispectral imaging system that allows quantification of skin lesions as well as tracking of disease progression in an automated fashion. To this end, both multispectral images are being acquired provide quantitative metrics of the skin, as well the size and geometry of the lesions.
Stereo Time-of-Flight

Stereo Time-of-Flight

This paper describes a novel method to acquire depth images based on combining a pair of ToF? (Time of Flight) cameras. As opposed to approaches that register point clouds posterior to the image acquisition, we propose to combine the measurements of the two cameras at the acquisition level. To do so, we actively control the infrared lighting of the scene such that the two cameras emit and measure the reflected infrared light first one after the other, and then simultaneously. Assuming the scene is static during these three stages and gathering the obtained depth measurements in each state, we derive a set of constraints that allow us to optimize the two depth images. In terms of hardware requirements, the cameras need to have access to the control of the infrared lights and should work with the same infrared wavelength and with exactly the same modulation frequency. A quantitative evaluation of the performance of the proposed method for different objects and setups is provided based on a simulation of the ToF? cameras. Results on real images are also provided. In both simulation and real images the stereo-ToF acquisition is able to produce more accurate depth measurements.
Scene Understanding From a Moving Camera

Scene Understanding From a Moving Camera

Modern vehicles are equipped with multiple cameras which are already used in various practical applications. Advanced driver assistance systems (ADAS) are of particular interest because of the safety and comfort features they offer to the driver. Camera based scene understanding is an important scientific problem that has to be addressed in order to provide the information needed for camera based driver assistance systems. While frontal cameras are widely used, there are applications where cameras observing lateral space can deliver better results. Fish eye cameras mounted in the side mirrors are particularly interesting, because they can observe a big area on the side of the vehicle and can be used for several applications for which the traditional front facing cameras are not suitable.

We present a general method for scene understanding using 3D reconstruction of the environment around the vehicle. It is based on pixel-wise image labeling using a conditional random field (CRF). Our method is able to create a simple 3D model of the scene and also to provide semantic labels of the different objects and areas in the image, like for example cars, sidewalks, and buildings.

We demonstrate how our method can be used for two applications that are of high importance for various driver assistance systems - car detection and free space estimation. We show that our system is able to perform in real time for speeds of up to 63 km/h.
Cardiac C-Arm CT

Cardiac C-Arm CT

Tomographic reconstruction from rotational cone-beam X-ray data is only solved for static objects of interest (like the abdominal region). In cardiac imaging, a rotational angiography sequence takes about 4 to 6s and therefore spans several heart beats. Since such an acquisition scheme forces a trade-off between consistency of the scene and reasonable baselines between camera positions, standard reconstruction techniques fail at recovering the 3D+t scene. We propose a new reconstruction framework based on variational level sets including a new data term for symbolic reconstruction as well as a novel incorporation of motion into the level set formalism. The resulting simultaneous estimation of shape and motion proves feasible in first experiments.
Advanced Robotics for Multi-Modal Interventional Imaging (RoBildOR)

Advanced Robotics for Multi-Modal Interventional Imaging (RoBildOR)

This project aims at developing advanced methods for robotic image acquisitions, enabling more flexible, patient- and process-specific functional and anatomical imaging with the operating theater. Using robotic manipulations, co-registered and dynamic imaging can be provided to the surgeon, allowing for optimal implementation of preoperative planning. In particular, this projects is the first one developing concepts for intraoperative SPECT-CT, and introduces intraoperative robotic Ultrasound imaging based on CT trajectory planning, enabling registration with angiographic data. With distinguished partners from Bavarian industry, this project has a fundamental contribution in developing safe, reliable, flexible, and multi-modal imaging technologies for the operating room of the future.
Reconstruction and Registration of Histology and Phase Contrast Images for Clinical Validation of Imaging Modalities

Reconstruction and Registration of Histology and Phase Contrast Images for Clinical Validation of Imaging Modalities

Before its introduction into the hospital, a new imaging modality has to be validated. In other words, appearing structures need to be correlated to the imaged tissues. Such a cross validation is only meaningful when performed against the gold standard which is histology. Currently, cross validation is performed by qualitative comparison of 3D datasets to 2D histology slices. Since the acquisition of a consistent 3D histology volume is a challenging task, its comparison to the corresponding dataset always remained qualitative.

The classic histology procedure can be divided in four steps: pre processing, cutting, post processing and imaging of the tissues. In the first step, the sample is chemically processed to preserve the tissues and is then embedded in a paraffin block. By using a microtome, it is cut in very thin slices, and put on a glass slide. During post processing the sample is stained to enhance the structures of interest. The imaging is performed with a camera mounted in a microscope, or with a dedicated scanner. Several difficulties inherent to this process can have a dramatic influence on the quality of the reconstructed histology volume. For instance, since the cutting process is done manually, problems like flipping, bending or ripping of the slides may happen. If the knife starts to wear off, some banding will appear over the slices. Moreover, a few slices could be missing. Finally since the staining color is time dependent, variation in the color of the slices can occur.

In this project, we propose to improve the histology procedure and to develop methods towards a consistent reconstruction of 3D histology volumes.
Developing Image Processing Techniques for Cryo Electron Tomography

Developing Image Processing Techniques for Cryo Electron Tomography

Cryo-ET has recently emerged as a leading technique to investigate the three-dimensional(3D) structure of biological specimens at close-to-native state. It also bridges the gap between low-resolution imaging techniques (e.g. light microscopy) and high-resolution techniques (e.g. single particle electron microscopy). The technique consists of acquiring many two-dimensional (2D) projections of the structure under scrutiny at various tilt angles under cryogenic conditions. The 3D structure is recovered through a number of steps including projection alignment, reconstruction and de-nosing. The resolution of the reconstructed tomogram, however, is a affected by the low signal to noise ratio (SNR) of the projection images (typically 0.1 to 0.01) and the limited angular coverage (typically 60  to 70 ) resulting in wedge-shaped missing information in Fourier space, the so-called missing wedge; making the reconstruction process very challenging and demanding.
Intra-operative Imaging and Navigation for Minimal Invasiveness in Head and Neck Cancer

Intra-operative Imaging and Navigation for Minimal Invasiveness in Head and Neck Cancer

Intra-operative Imaging and Navigation for Guidance in Neurosurgical Procedures

Intra-operative Imaging and Navigation for Guidance in Neurosurgical Procedures

Deformable Guide Wire Tracking

Deformable Guide Wire Tracking

These days, X-ray fluoroscopic imaging is the modality used most widely to guide physicians in angiographic interventions. Current guidance procedures are based on a roadmap, e.g. a digital subtracted angiography (DSA) acquired from a fixed viewpoint and the injection of contrast agent to visualize the current vessel anatomy. Such roadmaps cannot directly be blended with the fluoroscopic sequence due to misalignment caused by respiratory motion. A fundamental step toward a successful integration of any navigation application into clinical routine is the estimation and compensation of respiratory motion. We propose a novel method for deformable tracking of multiple ridge segments based on a MAP-MRF formulation and efficient discrete optimization. Ridges are modeled as B-Spline curves which allows us to apply smooth deformations based on a minimal number of parameters. Our tracking framework is well adapted to the noisy domain of fluoroscopic imaging and the handling of multiple segments.
Stereo Vision

Stereo Vision

This project focuses on the development of novel methods for efficient or accurate binocular stereo vision.
Assessment of Knee Cartilage

Assessment of Knee Cartilage

Degeneration of knee joint cartilage is an important and early indicator of osteoarthritis (OA) which is one of the major socio-economic burdens nowadays. Accurate quantification of the articular cartilage degeneration in an early stage using MR images is a promising approach in diagnosis and therapy for this disease. Particularly, volume and thickness measurement of cartilage tissue has been shown to deliver significant parameters in assessment of pathologies. Here, accurate computer-aided diagnosis tools could improve the clinical routine where image segmentation plays a crucial role. In order to overcome the time-consuming and tedious work of manual segmentation, one tries to automate the segmentation as much as possible. We focus on novel atlas-based segmentation methods for knee cartilage as well as improve today’s clinical routine of manual segmentation methods. In addition, we try to evaluate different methods for the assessment of parameters such as volume and thickness which could allow computer-aided diagnosis of knee cartilage pathologies in an early stage.
Endoscopic Video Processing

Endoscopic Video Processing

The diagnosis and surveillance of several gastrointestinal (GI) diseases such as colateral or oesaphageal cancer are performed under endoscopic guidance. However, currently there exists no computer aided navigation tool to support these procedures. The goal of this project is to provide an advanced visualisation and automatic recognition tool in order to support the navigation and targeting in GI endoscopic procedures. The aim of the project is twofold: reconstructing the organ surface from endoscopic videos using monoSLAM and automatically recognising the biopsy locations to support the navigation and targeting in endoscopy.

Related Publications

2017
S. Seyyedi, E. Liapi, T. Lasser, R. Ivkov, R. Hatwar, J. W. Stayman
Evaluation of Low-Dose CT Perfusion for the Liver using Reconstruction of Difference
To be presented at International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D), Xi'an Shaanxi, China, June 2017 (bib)
M. Wieczorek, F. Pfeiffer, T. Lasser
Micro-structure orientation extraction for Anisotropic X-Ray Dark-Field Tomography
To be presented at International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D), Xi'an Shaanxi, China, June 2017 (bib)
Y. Sharma, F. Schaff, M. Wieczorek, F. Pfeiffer, T. Lasser
Acquisition Schemes for Directional Dark-Field Tomographic Modalities
To be presented at International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D), Xi'an Shaanxi, China, June 2017 (bib)
N. Schilling, M. Wieczorek, T. Lasser
Statistical Models for Anisotropic X-Ray Dark-field Tomography
To be presented at International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D), Xi'an Shaanxi, China, June 2017 (bib)
Y. Sharma, F. Schaff, M. Wieczorek, F. Pfeiffer, T. Lasser
Design of Acquisition Schemes and Setup Geometry for Anisotropic X-ray Dark-Field Tomography (AXDT)
Accepted in Scientific Reports, 2017. (bib)
C. Ulas, PA. Gómez, JI. Sperl, C. Preibisch, MI. Menzel, A. Haase, B. Menze
A Robust Reconstruction Method for Quantitative Perfusion MRI: Application to Brain Dynamic Susceptibility Contrast (DSC) Imaging
Proceedings of the International Society of Magnetic Resonance in Medicine (ISMRM), Hawaii, USA, April 2017 (bib)
2016
J. Gardiazabal, P. Matthies, J. Vogel, B. Frisch, N. Navab, S. I. Ziegler, T. Lasser
Flexible Mini Gamma Camera Reconstructions of Extended Sources using Step and Shoot and List Mode
Medical Physics 43(12):6418-6428, 2016. (bib)
M. Wieczorek, F. Schaff, F. Pfeiffer, T. Lasser
Anisotropic X-Ray Dark-Field Tomography: A Continuous Model and its Discretization
Phys. Rev. Lett. 117, 158101, 2016 (bib)
Y. Sharma, M. Wieczorek, F. Schaff, S. Seyyedi, F. Prade, F. Pfeiffer, T. Lasser
Six dimensional X-ray Tensor Tomography with a compact laboratory setup
Appl. Phys. Lett. 109, 134102 (2016); http://dx.doi.org/10.1063/1.4963649 (bib)
S. Seyyedi, M. Wieczorek, C. Jud, F. Pfeiffer, T. Lasser
A Regularized X-ray Tensor Tomography Reconstruction Technique
International Conference on Image Formation in X-Ray Computed Tomography, Bamberg, Germany, July 2016 (bib)
M. Wieczorek, C. Jud, F. Schaff, F. Pfeiffer, T. Lasser
X-ray tensor tomography -- linear system approach to reconstruction
International Conference on Image Formation in X-Ray Computed Tomography, Bamberg, Germany, July 2016 (bib)
Y. Sharma, M. Wieczorek, C. Jud, F. Schaff, F. Pfeiffer, T. Lasser
X-ray Tensor Tomography: How much to measure?
International Conference on Image Formation in X-Ray Computed Tomography, Bamberg, Germany, July 2016 (bib)
C. Ulas, PA. Gómez, JI. Sperl, C. Preibisch, B. Menze
Spatio-temporal MRI Reconstruction by Enforcing Local and Global Regularity via Dynamic Total Variation and Nuclear Norm Minimization
Proceedings of International Symposium on Biomedical Imaging (ISBI), April 2016 (bib)
S. Seyyedi, M. Wieczorek, Y. Sharma, F. Schaff, C. Jud, F. Pfeiffer, T. Lasser
Component-based TV Regularization for X-ray Tensor Tomography
International Symposium on Biomedical Imaging (ISBI), Prague, Czech Republic, April 2016 (bib)
A. Fischer, T. Lasser, M. Schrapp, J. Stephan, P. B. Noël
Object Specific Trajectory Optimization for Industrial X-ray Computed Tomography
Scientific Reports 6:19135, 2016 (bib)
M. Wieczorek, F. Schaff, C. Jud, F. Pfeiffer, T. Lasser
An optimization oriented approach to X-ray tensor tomogprahy
International Symposium on BioMedical Applications of X-Ray Phase Contrast Imaging (IMXP), Garmisch-Patenkirchen, Germany, January 2016 (bib)
Y. Sharma, M. Wieczorek, F. Schaff, C. Jud, F. Pfeiffer, T. Lasser
Acquisition Geometry for X-ray Tensor Tomography
International Symposium on BioMedical Applications of X-Ray Phase Contrast Imaging (IMXP), Garmisch-Patenkirchen, Germany, January 2016 (bib)
C. Bluemel, P. Matthies, K. Herrmann, S. P. Povoski
3D Scintigraphic Imaging and Navigation in Radioguided Surgery: Freehand SPECT Technology and its Clinical Applications
Expert Review of Medical Devices, 2016 (bib)
2015
P. Matthies, B. Frisch, J. Vogel, T. Lasser, M. Friebe, N. Navab
Inside-Out Tracking for Flexible Hand-held Nuclear Tomographic Imaging
IEEE Nuclear Science Symposium and Medical Imaging Conference, San Diego, USA, November 2015 (bib)
J. Gardiazabal, B. Frisch, P. Matthies, J. Vogel, S. I. Ziegler, N. Navab, T. Lasser
List-Mode Reconstruction for Continuous Freehand SPECT Acquisitions
IEEE Nuclear Science Symposium and Medical Imaging Conference, San Diego, USA, November 2015 (bib)
C. Hennersperger, M. Baust, D. Mateus, N. Navab
Computational Sonography
MICCAI 2015, the 18th International Conference on Medical Image Computing and Computer Assisted Intervention (bib)
K. Schörner, A. Fischer, T. Lasser, M. Schrapp, J. Stephan, P. B. Noël
CT Reconstruction with Object Specific Non-Standard Trajectories
Intl. Symposium on Digital Industrial Radiology and Computed Tomography (DIR 2015), Ghent, Belgium, June 2015 (bib)
J. Vogel, F. Schaff, A. Fehringer, C. Jud, M. Wieczorek, F. Pfeiffer, T. Lasser
Constrained X-ray tensor tomography reconstruction
Optics Express 23(12):15134-15151, 2015 (bib)
M. Wieczorek, J. Vogel, A. Weinmann, C. Jud, F. Schaff, M. Storath, F. Pfeiffer, M. Baust, T. Lasser
Total Variation Regularization for X-Ray Tensor Tomography
Proceedings of Fully3D, Newport, USA, June 2015 (bib)
J. Vogel, M. Wieczorek, C. Jud, F. Schaff, F. Pfeiffer, T. Lasser
X-ray Tensor Tomography Reconstruction
Proceedings of Fully3D, Newport, USA, June 2015 (bib)
J. Gardiazabal, J. Vogel, P. Matthies, M. Wieczorek, B. Frisch, N. Navab, S. I. Ziegler, T. Lasser
Fully 3D thyroid imaging with mini gamma cameras
Proceedings of Fully3D, Newport, USA, June 2015 (bib)
M. Wieczorek, J. Frikel, J. Vogel, E. Eggl, F. Kopp, P. B. Noël, F. Pfeiffer, L. Demaret, T. Lasser
X-ray Computed Tomography using Curvelet Sparse Regularization
Medical Physics 42(4):1555, 2015 (bib)
T. Lasser, J. Gardiazabal, M. Wieczorek, P. Matthies, J. Vogel, B. Frisch, N. Navab
Towards 3D thyroid imaging using robotic mini gamma cameras
Bildverarbeitung für die Medizin, Lübeck, Germany, March 2015 (bib)
A. Hartl, D. I. Shakir, T. Lasser, S. I. Ziegler, N. Navab
Detection models for freehand SPECT reconstruction
Physics in Medicine and Biology 60(3):1031-1046, 2015 (bib)
2014
O. Zettinig, C. Hennersperger, C. Schulte zu Berge, M. Baust, N. Navab
3D Velocity Field and Flow Profile Reconstruction from Arbitrarily Sampled Doppler Ultrasound Data
Proceedings of the 17th International Conference on Medical Image Computing and Computer Assisted Interventions (MICCAI), Boston, USA, September 2014.
The original publication is available online at link.springer.com
(bib)
M. Müller, L.E.S. Helljesen, R. Prevost, I. Viola, K. Nylund, O.H. Gilja, N. Navab, W. Wein
Deriving Anatomical Context from 4D Ultrasound
Eurographics Workshop on Visual Computing for Biology and Medicine (VCBM), September 3-5 2014, Vienna, Austria (bib)
A. Okur, R. Voigt, R. Stauder, N. Navab
Investigation of performance log files of freehand SPECT acquisitions for usage characteristics and surgical phase determination
The 7th Hamlyn Symposium on Medical Robotics, London, UK, July 2014 (bib)
P. Matthies, J. Gardiazabal, A. Okur, T. Lasser, N. Navab
Accuracy evaluation of interventional nuclear tomographic reconstruction using mini gamma cameras
The 7th Hamlyn Symposium on Medical Robotics, London, UK, July 2014 (bib)
P. Matthies, J. Gardiazabal, A. Okur, J. Vogel, T. Lasser, N. Navab
Mini Gamma Cameras for Intra-operative Nuclear Tomographic Reconstruction
Medical Image Analysis 18(8):1329-1336, 2014 (bib)
A. Fehringer, T. Lasser, I. Zanette, P. B. Noël, F. Pfeiffer
A versatile tomographic forward- and back-projection approach on multi-GPUs
Proceedings of SPIE 9034, 90344F (2014) (bib)
M. Wieczorek, J. Vogel, T. Lasser
CampRecon - a software framework for linear inverse problems
Technical report, Technische Universität München, 2014. Available via mediatum. (bib)
A. Malecki, G. Potdevin, T. Biernath, E. Eggl, K. Willer, T. Lasser, J. Maisenbacher, J. Gibmeier, A. Wanner, F. Pfeiffer
X-Ray Tensor Tomography
Europhysics Letters 105(3):38002, 2014. (bib)
2013
P. Matthies, K. Sharma, A. Okur, J. Gardiazabal, J. Vogel, T. Lasser, N. Navab
First use of mini gamma cameras for intra-operative robotic SPECT reconstruction
Proceedings of the 16th International Conference on Medical Image Computing and Computer Assisted Interventions (MICCAI), Nagoya, Japan, September 2013 (bib)
P. Matthies, A. Okur, T. Wendler, N. Navab, M. Friebe
Combination of intra-operative freehand SPECT imaging with MR images for guidance and navigation
IEEE Engineering in Medicine and Biology (EMBC), Osaka, Japan, July 2013. (bib)
A. Malecki, G. Potdevin, T. Biernath, E. Eggl, T. Lasser, J. Maisenbacher, J. Gibmeier, A. Wanner, F. Pfeiffer
Directional X-Ray Scattering Tomography
Proceedings of Fully3D, Lake Tahoe, USA, June 2013 (bib)
W. Wein, A. Ladikos
Towards General Motion Recovery in Cone-Beam Computed Tomography
12th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, June 16-21 2013, Lake Tahoe, CA USA (bib)
M. Wieczorek, J. Frikel, J. Vogel, F. Pfeiffer, L. Demaret, T. Lasser
Curvelet sparse regularization for differential phase-contrast X-ray imaging
Proceedings of Fully3D, Lake Tahoe, USA, June 2013. (bib)
J. Vogel, T. Lasser, J. Gardiazabal, N. Navab
Trajectory optimization for intra-operative nuclear tomographic imaging
Medical Image Analysis 17(7):723-731, 2013. (bib)
A. Okur, D. I. Shakir, P. Matthies, A. Hartl, M. Essler, S. I. Ziegler, T. Lasser, N. Navab
Freehand Tomographic Nuclear Imaging Using Tracked High-Energy Gamma Probes
Bildverarbeitung für die Medizin 2013 (BVM), Heidelberg, Germany, March 2013.
The original publication is available online at www.springerlink.com
(bib)
2012
X. Cheng, J. Liu, J. Vogel, Z. Liu, N. Navab, S. I. Ziegler, K. Shi
Time-Activity Curve based Sinogram Decomposition for Streak Artifacts Reduction in Dynamic PET Reconstruction
Proceedings of the IEEE 2012 Medical Imaging Conference, Anaheim, California, USA, October 2012 (bib)
J. Vogel, T. Reichl, J. Gardiazabal, N. Navab, T. Lasser
Optimization of Acquisition Geometry for Intra-operative Tomographic Imaging
Proceedings of the 15th International Conference on Medical Image Computing and Computer Assisted Interventions (MICCAI), Nice, France, October 2012 (bib)
D. I. Shakir, A. Okur, A. Hartl, P. Matthies, M. Essler, S. I. Ziegler, T. Lasser, N. Navab
Towards Intra-operative PET for Head and Neck Cancer: Lymph Node Localization Using High-energy Probes
Proceedings of the 15th International Conference on Medical Image Computing and Computer Assisted Interventions (MICCAI), Nice, France, October 2012 (bib)
A. Karamalis, W. Wein, T. Klein, N. Navab
Ultrasound Confidence Maps using Random Walks
Medical Image Analysis, 16, 6, 1101 - 1112, 2012, DOI: http://dx.doi.org/10.1016/j.media.2012.07.005 (bib)
S. Abdurahman, A. Jerebko, T. Mertelmeier, T. Lasser, N. Navab
Out-of-plane artifact reduction in tomosynthesis based on regression modeling and outlier detection
11th Intl. Workshop on Breast Imaging (IWDM 2012), Philadelphia, USA, July 2012 (bib)
A. Hartl, D. I. Shakir, R. Kojchev, N. Navab, S. I. Ziegler, T. Lasser
Freehand SPECT reconstructions using look up tables
SPIE Medical Imaging Conference, February 4 - February 9 2012, San Diego, USA (bib)
D. I. Shakir, A. Hartl, F. R. Schneider, J. Pulko, S. I. Ziegler, N. Navab, T. Lasser
Two new ad-hoc models of detection physics and their evaluation for navigated beta probe surface imaging
Proceedings of SPIE Visualization, Image-Guided Procedures, and Modeling Conference, San Diego, CA, USA, February 2012 (bib)
2011
J.-H. Choi, A. Maier, A. Keil, R. Fahrig
Acquisition of 3D Knee Geometry under Weight-Bearing Conditions using a C-Arm CT Scanner
RSNA, Chicago, IL, U.S.A., November 2011 (bib)
A. Hartl, T. Lasser, N. Navab, S. I. Ziegler
Impact of acquisition geometry and physical model on Freehand SPECT reconstructions
IEEE Medical Imaging Conference, October 23 - October 29 2011, Valencia, Spain (bib)
D. I. Shakir, T. Lasser, A. Drzezga, S. I. Ziegler, N. Navab
Evaluation of Navigated Beta-Probe Surface Imaging on a Realistic 3D Phantom
Proceedings of the IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS-MIC), Valencia, Spain, October 2011 (bib)
W. Wein, A. Ladikos
Detecting Patient Motion in Projection Space for Cone-beam Computed Tomography
Medical Image Computing and Computer-Assisted Intervention (MICCAI 2011), Toronto, Canada, September 2011 (bib)
W. Wein, A. Ladikos, A. Baumgartner
Self-calibration of geometric and radiometric parameters for cone-beam computed tomography
11th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, July 11-15 2011, Potsdam, Germany. (bib)
A. Malecki, T. Biernath, M. Bech, T. Lasser, G. Potdevin, F. Pfeiffer
Towards the Reconstruction of 3D Orientation Information from Direction-Sensitive X-Ray Projections
Proceedings of Fully3D, Potsdam, Germany, June 2011 (bib)
B. Diotte, C. Cagniart, S. Ilic
Markerless Motion Capture in the Operating Room.
Technical Report, Technische Universität München, München, Germany, Mai 2011 (bib)
D. I. Shakir, A. Hartl, N. Navab, S. I. Ziegler
Evaluation of an ad hoc model of detection physics for navigated beta-probe surface imaging
Proceedings of SPIE Visualization, Image-Guided Procedures, and Modeling Conference, Lake Buena Vista (Orlando Area), FL, USA, February 2011 (bib)
T. Lasser, S. I. Ziegler, N. Navab
Freehand SPECT in low uptake situations
Proceedings of SPIE 7961, 79611Z, 2011 (bib)
A. Maier, J.-H. Choi, A. Keil, C. Niebler, M. Sarmiento, A. Fieselmann, G. Gold, S. Delp, R. Fahrig
Analysis of Vertical and Horizontal Circular C-Arm Trajectories
SPIE Medical Imaging, San Diego, CA, U.S.A., Feburary 2011 (bib)
2010
D. I. Shakir, N. Navab, S. I. Ziegler
Acquisition Model for Iterative Reconstruction of Navigated Beta-Probe Surface Images
Proceedings of the IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS-MIC), Knoxville, TN, USA, November 2010 (bib)
D. I. Shakir, J. Bieniarz, S. Pirsig, T. Wendler, N. Navab, S. I. Ziegler
A first study on biological feasibility of intraoperative control of tumor resection borders with navigated beta-probe surface imaging
Proceedings of the Annual Meeting of the Society of Nuclear Medicine (SNM), Salt Lake City, UT, USA, June 2010 (bib)
A. Plate, A. Ahmadi, T. Klein, N. Navab, J. Weiße, J. Mehrkens, K. Bötzel
Towards a More Objective Visualization of the Midbrain and its Surroundings Using 3D Transcranial Ultrasound
54. Jahrestagung der Deutschen Gesellschaft für Klinische Neurophysiologie und Funktionelle Bildgebung (DGKN), Halle, GER, March 2010 (bib)
C. Rohkohl, G. Lauritsch, A. Keil, J. Hornegger
CAVAREV--an open platform for evaluating 3D and 4D cardiac vasculature reconstruction
Physics in Medicine and Biology, vol. 55, no. 10, pp. 2905-2915, 2010 (bib)
M. Blume, A. Martinez-Möller, A. Keil, N. Navab, M. Rafecas
Joint Reconstruction of Image and Motion in Gated Positron Emission Tomography
IEEE Trans. Med. Imag., vol. 29, no. 11, pp. 1892-1906, November 2010 (bib)
M. Blume, A. Keil, N. Navab, M. Rafecas
Joint Reconstruction of Image and Motion for PET: Displacement Fields Versus a B-Spline Motion Model
Proc. IEEE Nuclear Science Symposium and Medical Imaging Conference, Knoxville, TN, U.S.A., October 2010 (bib)
M. Blume, M. Rafecas
Joint Reconstruction of Image and Motion for PET Using Linear Diffusion Regularization
Congreso Anual de la Sociedad Espa\~nola de Ingenier\'ia Biom\'edica, Madrid, Spain, November 2010 (bib)
2009
T. Wendler, K. Herrmann, A. Schnelzer, T. Lasser, J. Traub, O. Kutter, T. Schuster, M. Kiechle, M. Schwaiger, N. Navab, S. I. Ziegler, A. K. Buck
Clinical introduction of freehand SPECT for image-guided sentinel lymph node biopsy
Proceedings of Annual Congress of the European Association of of Nuclear Medicine (EANM 2009), Barcelona, Spain, October 2009 (bib)
T. Wendler, X. Feng, K. Herrmann, T. Lasser, J. Traub, S. I. Ziegler, N. Navab, A. K. Buck
2D/3D registration of freehand SPECT and planar scintigraphy for clinical evaluation of 3D thyroid scintigraphy
Proceedings of Annual Congress of the European Association of of Nuclear Medicine (EANM 2009), Barcelona, Spain, October 2009 (bib)
T. Wendler, K. Herrmann, T. Lasser, J. Traub, M. Schwaiger, N. Navab, S. I. Ziegler, A. K. Buck
First experience with freehand SPECT for lymphatic mapping in melanoma in upper body
Proceedings of Annual Congress of the European Association of of Nuclear Medicine (EANM 2009), Barcelona, Spain, October 2009 (bib)
T. Wendler, T. Lasser, J. Traub, S. I. Ziegler, N. Navab
Freehand SPECT / ultrasound fusion for hybrid image-guided resection
Proceedings of Annual Congress of the European Association of of Nuclear Medicine (EANM 2009), Barcelona, Spain, October 2009 (bib)
T. Lasser, A. Duliu, T. Wendler, S. I. Ziegler, N. Navab
Interactive Reconstruction for Freehand SPECT: An Approach to Acquisition Guidance?
Proceedings of Annual Congress of the European Association of of Nuclear Medicine (EANM 2009), Barcelona, Spain, October 2009 (bib)
A. Keil, J. Vogel, G. Lauritsch, N. Navab
Dynamic Cone Beam Reconstruction Using a New Level Set Formulation
Medical Image Computing and Computer Assisted Intervention (MICCAI), London, UK, September 20-24, 2009. (bib)
C. Özgür, J. Bieniarz, T. Lasser, S. I. Ziegler, N. Navab, T. Wendler
Phenomenological Models for intraoperative Positron Emission Surface Imaging using Handheld Probes
Proceedings of World Congress in Medical Physics and Biomedical Engineering (WC 2009), Munich, Germany, September 2009 (bib)
A. Keil, J. Vogel, G. Lauritsch, N. Navab
Dynamic Cone-Beam Reconstruction Using a Variational Level Set Formulation
Proc. Int'l Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine (Fully3D), Beijing, P.R. China, September 5-10, 2009. (bib)
V. Castaneda, S. Atasoy, D. Mateus, N. Navab, A. Meining
Reconstructing the Esophagus Surface from Endoscopic Image Sequences
5th Russian-Bavarian Conference on Bio-Medical Engineering, Munich, Germany, July 1-4 2009. (bib)
A. Ahmadi, T. Klein, N. Navab
Advanced Planning and Ultrasound Guidance for Keyhole Neurosurgery in ROBOCAST
Russian Bavarian Conference (RBC), Munich, GER, July 2009 (bib)
A. Ahmadi, T. Klein, N. Navab, R. Roth, R.R. Shamir, L. Joskowicz, E. DeMomi?, G. Ferrigno, L. Antiga, R.I. Foroni
Advanced Planning and Intra-operative Validation for Robot-Assisted Keyhole Neurosurgery In ROBOCAST
International Conference on Advanced Robotics (ICAR), Munich, GER, June 2009 (bib)
T. Wendler, K. Herrmann, T. Lasser, J. Traub, M. Schwaiger, S. I. Ziegler, N. Navab, A. K. Buck
Freehand SPECT: first in-vivo evaluation and comparison to conventional lymphatic mapping
Proceedings of Annual Meeting of Society of Nuclear Medicine (SNM 2009), Toronto, Canada, June 2009 (bib)
A. Karamalis, W. Wein, O. Kutter, N. Navab
Fast Hybrid Freehand Ultrasound Volume Reconstruction
In Proc. SPIE Medical Imaging, Orlando, Florida, USA, February 2009 (bib)
M. Blume, A. Keil, N. Navab, M. Rafecas
Blind Motion Compensation for Positron-Emission-Tomography
SPIE Medical Imaging, Orlando, FL, U.S.A., Feburary 2009 (bib)
M. Blume, A. Martinez-Möller, A. Keil, N. Navab, M. Rafecas
Simultaneous Reconstruction of Image and Motion in Gated Positron-Emission-Tomography
Proc. IEEE Nuclear Science Symposium and Medical Imaging Conference, Orlando, FL, U.S.A., October 2009 (bib)
M. Blume, A. Martinez-Möller, A. Keil, N. Navab, M. Rafecas
Joint Reconstruction of Image and Motion in Gated Positron-Emission-Tomography
10th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, Beijing, China, September 2009 (bib)
T. Felder, M. Blume, J. Oliver, M. Rafecas
ML-EM Implementation on a GPU: Avoiding Simultaneous Read-Modify-Write Processes
10th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, Beijing, China, September 2009 (bib)
2008
T. Lasser, T. Wendler, J. Traub, S. I. Ziegler, N. Navab
Definition of optimal collimator geometries for 3D tomographic thyroid scintigraphy using navigated gamma probes
Proceedings of Annual Congress of the European Association of Nuclear Medicine (EANM 2008), Munich, Germany, October 2008 (bib)
T. Wendler, T. Lasser, A. K. Buck, J. Traub, M. Schwaiger, S. I. Ziegler, N. Navab
First case report of 3D tomographic thyroid scintigraphy with tracked gamma probes
Proceedings of Annual Congress of the European Association of Nuclear Medicine (EANM 2008), Munich, Germany, October 2008, Eur J Nuc Med Mol Imaging, vol. 35 (Suppl. 2), S129 (bib)
A. Bigdelou, A. Ladikos, N. Navab
Shape from Silhouette in Dynamic Scenes
Technical Report at Technical University of Munich (TUM), Munich (DE), August 15, 2008 (bib)
T. Wendler, A. Hartl, T. Lasser, J. Traub, S. I. Ziegler, N. Navab
3D Intra-operative nuclear imaging for SLNB in neck
Proceedings of Annual Meeting of Society of Nuclear Medicine (SNM 2008), New Orleans, USA, June 2008 (bib)
M. Blume, M. Rafecas, S. I. Ziegler, N. Navab
Combined Motion Compensation and Reconstruction for PET
Proc. IEEE Nuclear Science Symposium and Medical Imaging Conference, Dresden, Germany, October 2008 (bib)

Working Group

Ahmadi
Ahmad Ahmadi
Albarqouni
Shadi Albarqouni
Bin Radin Nasirudin
Radin Adi Aizudin Bin Radin Nasirudin
Coskun
Huseyin Coskun
Djordjevic
Danilo Djordjevic
Duliu
Alexandru O. Duliu
Gutjahr
Ralf Gutjahr
Haltakov
Vladimir Haltakov
Hennersperger
Christoph Hennersperger
Lasser
Tobias Lasser
Matthies
Philipp Matthies
Noel
Peter B Noel
Okur Kuru
Aslı Okur Kuru
Rupprecht
Christian Rupprecht
Shi
Kuangyu Shi
Slavcheva
Mira Slavcheva
Unger
Christian Unger
Wieczorek
Matthias Wieczorek


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