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Virtual Mirror: Interaction Paradigm for Augmented Reality Applications (Video2)
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Laparoscopic Virtual Mirror for Understanding Vessel Structure: Evaluation Study by Twelve Surgeons

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News

2 February 2012, MI 03.13.10
Crepuscular rays for tumor accessibility planning
Rostislav Khlebnikov, PhD student at Graz University of Technology, will present his work on scientific and medical visualization.

30 January 2012, MI 00.12.019
QUANTITATIVE EVALUTATION OF 4D MYOCARDIAL STRAIN MEASURES VIA OPTICAL FLOW WITH A FINITE ELEMENT MODEL FITTED TO SONOMICROMETRY
Dynamic cardiac metrics, including strains and displacements, can provide a quantitative approach to evaluate cardiac function. However, in current clinical diagnosis, strain measures in 2D are used despite the fact that cardiac motions are complex changes in 4D. Recent advances in 4D ultrasound enable the capability to capture such complex motion in real time. In our previous work, a 4D optical flow based motion tracking algorithm was developed to extract full 4D dynamic cardiac metrics from such 4D ultrasound data. In order to quantitatively evaluate this method, coronary artery occlusion experiments at various locations were performed on five canine hearts with 4D ultrasound and sonomicrometry data acquired during the occlusion. Optical flow displacement was then mapped onto a finite element field fitted model. Corresponding 4D ultrasound data from these experiments were then analyzed. Estimated principal strains were directly compared to those recorded by sonomicrometry showing strong agreement. This was the first validation study of optical flow based strain estimation for 4D cardiac ultrasound including a direct comparison with sonomicrometry on in vivo data.

27 January 2012, MI 03.13.010
Modeling Brain Circuitry over a Wide Range of Scales
Electron microscopes (EM) can now provide the nanometer resolution that is needed to image synapses, and therefore connections, while Light Microscopes (LM) see at the micrometer resolution required to model the 3D structure of the dendritic network. Since both the arborescence and the connections are integral parts of the brain's wiring diagram, combining these two modalities is critically important. In this talk, I will therefore present our approach to building the dendritic arborescence and to tracking migrating neurons from LM images, as well as to segmenting intra-neuronal structures from EM images. I will also argue that the techniques that are in wide usage in the Computer Vision and Machine Learning community are just as applicable in this context.

26 January 2012, MI 01.13.010
Multi-People Tracking through Global Optimization
Given three or four synchronized videos taken at eye level and from different angles, we show that we can effectively detect and track people, even when the only available data comes from the binary output of a simple blob detector and the number of present individuals is a priori unknown. We start from occupancy probability estimates in a top view and rely on a generative model to yield probability images to be compared with the actual input images. We then refine the estimates so that the probability images match the binary input images as well as possible. Finally, having performed this computation independently at each time step, we compute trajectories over tive by solving a convex constrained flow problem, which allows us accurately follow individuals across thousands of frames. Our algorithm yields metrically accurate trajectories for each one of them, in spite of very significant occlusions. In short, we combine a mathematically well-founded generative model that works in each frame individually with a simple approach to global optimization. This yields excellent performance using very simple models that could be further improved.

16 January 2012, MI 02.08.020
Invited Talk by Bharat Rao, Ph.D., Siemens Healthcare, Inc., Malvern, PA, USA
Dr. Bharat Rao, Senior Director and Head of the Knowledge Solutions (KS) group Health Analytics & Business Intelligence business unit in Siemens Healthcare, will give an invited talk on mining medical images to automatically detect potentially abnormal structures, automated decision-support & inference from EMR’s and personalized medicine for therapy selection.

22 December 2011, MI 03.13.010
Invited Talk by Prof. Franjo Pernuš, PhD, University of Ljubljana
In an invited talk at the CAMP lecture, Prof. Franjo Pernuš, PhD, University of Ljubljana, will present an overview of existing methods, three novel methods for registering 3D CT or MR images to 2D X-ray images, and quantitative registration results.

Recent Publications

12 February 2012,
Paper accepted at IEEE Transactions on Medical Imaging (TMI)
Our paper Closed-form inverse kinematics for interventional C-arm X-ray imaging with six degrees of freedom: modeling and application has been accepted by the IEEE Transactions on Medical Imaging. IEEE Transactions on Medical Imaging is the number one cited journal in Imaging Science & Photographic Technology, the number three cited journal in Biomedical Engineering and has currently an impact factor of 3.54 (5-year impact factor: 4.34).

30 January 2012,
One paper accepted at IEEE Virtual Reality (VR) Conference 2012.
The publication mirracle: An Augmented Reality Magic Mirror System for Anatomy Education has been accepted as poster and research demo at the IEEE Virtual Reality (VR) conference. IEEE VR is the premier international conference and exhibition on virtual reality. In this publication mirracle, our augmented reality magic mirror system, is presented.

11 January 2012,
2 Papers accepted at ACM Conference on Intelligent User Interfaces (IUI) 2012
ACM Conference on Intelligent User Interfaces is based on full paper submissions and double blind review process in which each paper receives at least 5 peer reviews. This year IUI 2012 received 212 paper submissions. Only 17 long and 17 short papers got accepted (16% acceptance rate). Furthermore, among 146 submissions for demonstration papers, only 8 papers got accepted (18% acceptance rate).

11 January 2012,
One paper accepted at IEEE Symposium on 3D User Interfaces (3DUI) 2012.
IEEE 3DUI Conference is based on full paper submissions and double blind review process in which each paper receives at least 3 peer reviews. We have a long paper accepted at 3DUI 2012!

11 January 2012,
One paper accepted at 21th International Conference of Usability Professionals Association (UPA) 2012.
UPA conference is based on full paper submissions and double blind review process in which each paper receives at least 4 peer reviews. This year UPA 2012 received 346 paper submissions. Only 65 papers got accepted (18% acceptance rate).

	2 February 2012, MI 03.13.10 Crepuscular rays for tumor accessibility planning Rostislav Khlebnikov, PhD student at Graz University of Technology, will present his work on scientific and medical visualization.
	30 January 2012, MI 00.12.019 QUANTITATIVE EVALUTATION OF 4D MYOCARDIAL STRAIN MEASURES VIA OPTICAL FLOW WITH A FINITE ELEMENT MODEL FITTED TO SONOMICROMETRY Dynamic cardiac metrics, including strains and displacements, can provide a quantitative approach to evaluate cardiac function. However, in current clinical diagnosis, strain measures in 2D are used despite the fact that cardiac motions are complex changes in 4D. Recent advances in 4D ultrasound enable the capability to capture such complex motion in real time. In our previous work, a 4D optical flow based motion tracking algorithm was developed to extract full 4D dynamic cardiac metrics from such 4D ultrasound data. In order to quantitatively evaluate this method, coronary artery occlusion experiments at various locations were performed on five canine hearts with 4D ultrasound and sonomicrometry data acquired during the occlusion. Optical flow displacement was then mapped onto a finite element field fitted model. Corresponding 4D ultrasound data from these experiments were then analyzed. Estimated principal strains were directly compared to those recorded by sonomicrometry showing strong agreement. This was the first validation study of optical flow based strain estimation for 4D cardiac ultrasound including a direct comparison with sonomicrometry on in vivo data.
	27 January 2012, MI 03.13.010 Modeling Brain Circuitry over a Wide Range of Scales Electron microscopes (EM) can now provide the nanometer resolution that is needed to image synapses, and therefore connections, while Light Microscopes (LM) see at the micrometer resolution required to model the 3D structure of the dendritic network. Since both the arborescence and the connections are integral parts of the brain's wiring diagram, combining these two modalities is critically important. In this talk, I will therefore present our approach to building the dendritic arborescence and to tracking migrating neurons from LM images, as well as to segmenting intra-neuronal structures from EM images. I will also argue that the techniques that are in wide usage in the Computer Vision and Machine Learning community are just as applicable in this context.
	26 January 2012, MI 01.13.010 Multi-People Tracking through Global Optimization Given three or four synchronized videos taken at eye level and from different angles, we show that we can effectively detect and track people, even when the only available data comes from the binary output of a simple blob detector and the number of present individuals is a priori unknown. We start from occupancy probability estimates in a top view and rely on a generative model to yield probability images to be compared with the actual input images. We then refine the estimates so that the probability images match the binary input images as well as possible. Finally, having performed this computation independently at each time step, we compute trajectories over tive by solving a convex constrained flow problem, which allows us accurately follow individuals across thousands of frames. Our algorithm yields metrically accurate trajectories for each one of them, in spite of very significant occlusions. In short, we combine a mathematically well-founded generative model that works in each frame individually with a simple approach to global optimization. This yields excellent performance using very simple models that could be further improved.
	16 January 2012, MI 02.08.020 Invited Talk by Bharat Rao, Ph.D., Siemens Healthcare, Inc., Malvern, PA, USA Dr. Bharat Rao, Senior Director and Head of the Knowledge Solutions (KS) group Health Analytics & Business Intelligence business unit in Siemens Healthcare, will give an invited talk on mining medical images to automatically detect potentially abnormal structures, automated decision-support & inference from EMR’s and personalized medicine for therapy selection.
	22 December 2011, MI 03.13.010 Invited Talk by Prof. Franjo Pernuš, PhD, University of Ljubljana In an invited talk at the CAMP lecture, Prof. Franjo Pernuš, PhD, University of Ljubljana, will present an overview of existing methods, three novel methods for registering 3D CT or MR images to 2D X-ray images, and quantitative registration results.

	12 February 2012, Paper accepted at IEEE Transactions on Medical Imaging (TMI) Our paper Closed-form inverse kinematics for interventional C-arm X-ray imaging with six degrees of freedom: modeling and application has been accepted by the IEEE Transactions on Medical Imaging. IEEE Transactions on Medical Imaging is the number one cited journal in Imaging Science & Photographic Technology, the number three cited journal in Biomedical Engineering and has currently an impact factor of 3.54 (5-year impact factor: 4.34).
	30 January 2012, One paper accepted at IEEE Virtual Reality (VR) Conference 2012. The publication mirracle: An Augmented Reality Magic Mirror System for Anatomy Education has been accepted as poster and research demo at the IEEE Virtual Reality (VR) conference. IEEE VR is the premier international conference and exhibition on virtual reality. In this publication mirracle, our augmented reality magic mirror system, is presented.
	11 January 2012, 2 Papers accepted at ACM Conference on Intelligent User Interfaces (IUI) 2012 ACM Conference on Intelligent User Interfaces is based on full paper submissions and double blind review process in which each paper receives at least 5 peer reviews. This year IUI 2012 received 212 paper submissions. Only 17 long and 17 short papers got accepted (16% acceptance rate). Furthermore, among 146 submissions for demonstration papers, only 8 papers got accepted (18% acceptance rate).
	11 January 2012, One paper accepted at IEEE Symposium on 3D User Interfaces (3DUI) 2012. IEEE 3DUI Conference is based on full paper submissions and double blind review process in which each paper receives at least 3 peer reviews. We have a long paper accepted at 3DUI 2012!
	11 January 2012, One paper accepted at 21th International Conference of Usability Professionals Association (UPA) 2012. UPA conference is based on full paper submissions and double blind review process in which each paper receives at least 4 peer reviews. This year UPA 2012 received 346 paper submissions. Only 65 papers got accepted (18% acceptance rate).