TY - JOUR A1 - Sze, Daniel Y. A1 - Strobel, Norbert A1 - Fahrig, Rebecca A1 - Moore, Teri A1 - Busque, Stephan A1 - Frisoli, Joan K. T1 - Transjugular intrahepatic portosystemic shunt creation in a polycystic liver facilitated by hybrid cross-sectional/angiographic imaging JF - Journal of Vascular and Interventional Radiology (JVIR) N2 - Polycystic liver disease (PCLD) has long been considered to represent a contraindication to transjugular intrahepatic portosystemic shunt (TIPS) creation, primarily because of the risk of hemorrhage. Three-dimensional (3D) navigation within the enlarged and potentially disorienting parenchyma can now be performed during the procedure with the development of C-arm cone-beam computed tomography, which relies on the same equipment already used for angiography. Such a hybrid 3D reconstruction-enabled angiography system was used for safe image guidance of a TIPS procedure in a patient with PCLD. This technology has the potential to expedite any image-guided procedure that requires 3D navigation. Y1 - 2006 U6 - https://doi.org/10.1097/01.rvi.0000208984.17697.58 VL - 17 IS - 4 SP - 711 EP - 715 ER - TY - JOUR A1 - Strobel, Norbert A1 - Spors, Sascha A1 - Rabenstein, Rudolf T1 - Joint audio-video object localization and tracking JF - IEEE Signal Processing Magazine N2 - There has been a tremendous amount of research on object localization either involving microphone arrays or video cameras. Considerable less attention has been paid, however, to object localization and tracking based on joint audio-video processing thus far. This may be related to the lack of suitable algorithms for object localization simultaneously using multimicrophone outputs and color image sequences. In this article, we propose a solution to this problem. Before elaborating on joint audio-video processing, we review some previous work the areas of audio and video object localization. Then a recursive sensor fusion method based on decentralized Kalman filtering is introduced. Unfortunately, the decentralized Kalman filter cannot be directly used for joint audio-video object localization due to specific properties of the audio sensor. By properly adjusting the local audio position estimator, however, we manage to keep the overall architecture. We stress the general methodology. Y1 - 2001 U6 - https://doi.org/10.1109/79.911196 VL - 18 IS - 1 SP - 22 EP - 31 PB - IEEE ER - TY - JOUR A1 - Ramponi, Giovanni A1 - Strobel, Norbert A1 - Mitra, Sanjit K. A1 - Yu, Tian-Hu T1 - Nonlinear unsharp masking methods for image contrast enhancement JF - Journal of Electronic Imaging N2 - In the unsharp masking approach for image enhancement, a fraction of the highpass filtered version of the image is added to the original image to form the enhanced version. The method is simple, but it suffers from two serious drawbacks. First, it enhances the contrast in the darker areas perceptually much more strongly than that in the lighter areas. Second, it enhances the noise and/or digitization effects, particularly in the darker regions, resulting in visually less pleasing enhanced images. In general, noise can be suppressed with lowpass filters, which are associated with the blurring of the edges. On the other hand, contrast can be enhanced with highpass filters, which are associated with noise amplification. A reasonable solution, therefore, is to use suitable nonlinear filters which combine the features of both highpass and lowpass filters. This paper outlines several new methods of unsharp masking based on the use of such nonlinear filters. Computer simulations have verified the superior results obtained using these filters. In addition, a new measure of contrast enhancement is introduced which quantitatively supports the improvement obtained using the proposed methods. Y1 - 1996 U6 - https://doi.org/10.1117/12.242618 VL - 5 IS - 3 SP - 353 EP - 366 ER - TY - CHAP A1 - Bourier, F. A1 - Schneider, H.-J. A1 - Ganslmeier, F. A1 - Heißenhuber, F. A1 - Fischer, R. A1 - Brost, A. A1 - Koch, M. A1 - Strobel, Norbert A1 - Hornegger, J. A1 - Kurzidim, K. T1 - Unterstützung der transseptalen Punktion durch vorherige Überlagerung eines 3D-Volumens von linkem Atrium und Aorta T2 - 77. Jahrestagung Frühjahrestagung der Gesellschaft für Kardiologie Mannheim 27.04. - 30.04.2011 Y1 - 2011 ER - TY - CHAP A1 - Koch, M. A1 - Langenkamp, A. A1 - Kiraly, A. A1 - Brost, A. A1 - Strobel, Norbert A1 - Hornegger, J. T1 - Navigation System with Contact Force Assessment to Guide Pulmonary Vein Isolation Procedures T2 - 23rd Conference of the Society for Medical Innovation and Technology (SMIT) Tel Aviv 01/2011 Y1 - 2011 UR - https://www5.informatik.uni-erlangen.de/Forschung/Publikationen/2011/Koch11-NSW.pdf UR - https://cris.fau.de/publications/113140984/ ER - TY - CHAP A1 - Bourier, F. A1 - Brost, A. A1 - Kleinoeder, A. A1 - Schneider, H.-J. A1 - Heißenhuber, F. A1 - Ganslmeier, P. A1 - Raab, J. A1 - Koch, M. A1 - Hornegger, J. A1 - Strobel, Norbert A1 - Kurzidim, K. T1 - 3D-Visualisation of Cryo-Balloon Ablation Catheters to Evaluate Left Atrial Anatomy for PVI T2 - Venice Arrhythmias 01/2011 Y1 - 2011 UR - https://cris.fau.de/publications/121376684/ ER - TY - CHAP A1 - Bourier, F. A1 - Schneider, H.-J. A1 - Heißenhuber, F. A1 - Ganslmeier, P. A1 - Brost, A. A1 - Koch, M. A1 - Hornegger, J. A1 - Kleinoeder, A. A1 - Kiraly, A. A1 - Barbot, J. A1 - Strobel, Norbert A1 - Kurzidim, K. T1 - Augmented Fluoroscopy to Guide Transseptal Puncture T2 - Venice Arrhythmias 2011 01/2011 Y1 - 2011 ER - TY - CHAP A1 - Bourier, F. A1 - Schneider, H.-J. A1 - Heißenhuber, F. A1 - Ganslmeier, P. A1 - Brost, A. A1 - Koch, M. A1 - Hornegger, J. A1 - Kleinoeder, A. A1 - Kiraly, A. A1 - Barbot, J. A1 - Strobel, Norbert A1 - Kurzidim, K. T1 - Pulmonary Vein Isolation guided by fluoroscopybased 3D-Navigation on a biplane angiography system T2 - Venice Arrhythmias 2011 01/2011 Y1 - 2011 ER - TY - CHAP A1 - Brost, A. A1 - Wimmer, A. A1 - Liao, R. A1 - Hornegger, J. A1 - Strobel, Norbert T1 - Catheter Tracking: Filter-Based vs. Learning-Based T2 - M. Goesele, S. Roth, A. Kuijper, B. Schiele, K. Schindler (eds.) Pattern Recognintion, LNCS, vol. 6376 T2 - Part of the book series: Lecture Notes in Computer Science ((LNIP,volume 6376)) T3 - Lecture Notes in Computer Science - 6376 Y1 - 2010 SN - 978-3-642-15985-5 U6 - https://doi.org/https://doi.org/10.1007/978-3-642-15986-2_30 SP - 293 EP - 302 PB - Springer CY - Berlin, Heidelberg ER - TY - CHAP A1 - Hoffmann, Matthias A1 - Müller, Simone A1 - Kurzidim, Klaus A1 - Strobel, Norbert A1 - Hornegger, Joachim T1 - Robust Identification of Contrasted Frames in Fluoroscopic Images T2 - Bildverarbeitung für die Medizin 2015 N2 - For automatic registration of 3-D models of the left atrium to fluoroscopic images, a reliable classification of images containing contrast agent is necessary. Inspired by previous approaches on contrast agent detection, we propose a learning-based framework which is able to classify contrasted frames more robustly than previous methods, Furthermore, we performed a quantitative evaluation on a clinical data set consisting of 34 angiographies. Our learning-based approach reached a classification rate of 79.5%. The beginning of a contrast injection was detected correctly in 79.4%. Y1 - 2015 SN - 978-3-662-46223-2 SN - 978-3-662-46224-9 U6 - https://doi.org/10.1007/978-3-662-46224-9_6 PB - Springer Vieweg CY - Berlin, Heidelberg ER -