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 - TY - CHAP A1 - Hohl, C. A1 - Boese, Jan A1 - Strobel, Norbert A1 - Banckwitz, R. A1 - Lauritsch, G. A1 - Mühlenbruch, G. A1 - Günther, R. W. T1 - Angiographische CT: Messung der Patientendosis T2 - RöFo: Fortschritte auf dem Gebiet Röntgenstrahlen und bildgebenden Verfahren N2 - Ziele: Messung der Organ- und Effektivdosen bei Angiographischen CT-Untersuchungen (ACT) des Kopfs, des Herzens, der Leber sowie der Lendenwirbelsäule (LWS) mit einem anthropomorphen Phantom und Thermolumineszenz Dosimetern (TLD). Methode: ACT erlaubt die Schnittbildgebung von Weichteilstrukturen bei der Verwendung einer C-Bogen Durchleuchtungseinheit mit Flachbilddetektor. Um die sowohl die Organdosen als auch die effektiven Dosen bei ACT-Untersuchungen des Kopfs, des Herzens, der Leber und der LWS zu bestimmen, wurde ein männliches Alderson-Rando-Phantom mit jeweils 129 TLD an 43 Messstellen bestückt. Die Messungen wurden an zwei ACT-Systemen (AXIOM Artis, VB31C, Siemens, Forchheim) mit verschiedenen Detektorgrößen (20×20cm und 30×40cm) durchgeführt. Mit dem 20×20 Detektor wurden der Kopf (70kV, 126 frames, 0,36µGy/frame, 7,9ms/frame), die LWS (90kV, 275 frames, 0,36Gy/frame, 4,9ms/frame) und das Herz (70kV, 126 frames, 0,54µGy/frame, 10,9ms/frame) untersucht. Mit dem 30×40 Detektor wurden der Kopf (84kV, 496 frames, 1,2µGy/frame, 11,6ms/frame) die Leber (90kV, 397 frames, 0,36µGy/frame, 4,9ms/frame) und das Herz (70kV, 248 frames, 0,54µGy/frame, 4,9ms/frame) untersucht. Zusätzlich wurde mit dem 30×40 Detektor noch eine EKG-getriggerte Herz-Untersuchung durchgeführt (992 frames, Phasen-Zentrum 75%, Phasen-Länge 50%, 50% mAs-Modulation). Nach jeder Messung wurden die TLD gewechselt und ausgewertet. Gemäß den ICRP-Empfehlungen sind Organ- und Effektivdosen berechnet worden, die dann mit bekannten Dosiswerten vergleichbarer MSCT-Untersuchungen korreliert wurden. Ergebnis: Die Messungen der effektiven Dosis für den 20×20 Detektor ergaben Werte von 0,2mSv (Kopf), 2,76mSv (LWS) und 1,25mSv (Herz). Mit dem 30×40 Detektor ergaben sich Werte von 2,95mSv (Kopf), 6,71mSv (Leber) und 3,31mSv (Herz, 248 frames). Für die EKG-getriggerte Untersuchung des Herzens ergab sich eine effektive Dosis von 10,88 mSv bei 4 Umläufen (992 frames). Vergleichbare MSCT-Untersuchung belaufen sich auf 2,9mSv (Kopf), 4,8mSv (LWS), 4,3mSv (Leber) und 8,3mSv (Herz). Schlussfolgerung: Da ACT-Systeme mit einer Belichtungsautomatik ausgestattet sind, hängt die effektive Dosis stark vom Patientendurchmesser ab. Bei Messungen mit dem anthropomorphen Phantom konnte gezeigt werden, dass die effektiven Dosen von ACT-Untersuchungen sogar noch unterhalb von vergleichbaren MSCT-Untersuchungen liegen können. Allerdings muss dabei berücksichtigt werden, dass die Bildqualität und insbesondere der Weichteilkontrast nicht vergleichbar sind. Y1 - 2008 U6 - https://doi.org/10.1055/s-2008-1073628 VL - 180 IS - S 1 ER - TY - JOUR A1 - Bourier, Felix A1 - Fahrig, Rebecca A1 - Wang, Paul A1 - Santangeli, Pasquale A1 - Kurzidim, Klaus A1 - Strobel, Norbert A1 - Moore, Teri A1 - Hinkel, Cameron A1 - Al-Ahmad, Amin T1 - Accuracy assessment of catheter guidance technology in electrophysiology procedures: a comparison of a new 3D-based fluoroscopy navigation system to current electroanatomic mapping system JF - Journal of Cardiovascular Electrophysiology N2 - Background: With increasing complexity in electrophysiology (EP) procedures, the use of electroanatomic mapping systems (EAMS) as a supplement to fluoroscopy has become common practice. This is the first study that evaluates spatial and point localization accuracy for 2 current EAMS, CARTO3(®) (Biosense Webster, Diamond Bar, CA, USA) and EnSite Velocity(®) (St. Jude Medical Inc., St. Paul, MN, USA), and for a novel overlay guidance (OG) software (Siemens AG, Forchheim, Germany) in a phantom experiment. Methods and results: A C-arm CT scan was performed on an acrylic phantom containing holes and location markers. Spatial accuracy was assessed for each system using distance measurements involving known markers inside the phantom and properly placed catheters. Anatomical maps of the phantom were acquired by each EAMS, whereas the 3D-based OG software superimposed an overlay image of the phantom, segmented from the C-arm CT data set, onto biplane fluoroscopy. Registration processes and landmark measurements quantitatively assessed the spatial accuracy of each technology with respect to the ground truth phantom. Point localization performance was 0.49 ± 0.25 mm in OG, 0.46 ± 0.17 mm in CARTO3(®) and 0.79 ± 0.83 mm in EnSite(®) . The registration offset between virtual visualization and reality was 1.10 ± 0.52 mm in OG, 1.62 ± 0.77 mm in CARTO3(®) and 2.02 ± 1.21 mm in EnSite(®) . The offset to phantom C-arm CT landmark measurements was 0.30 ± 0.26 mm in OG, 0.24 ± 0.21 mm in CARTO3(®) and 1.32 ± 0.98 mm in EnSite(®) . Conclusions: Each of the evaluated EP guidance systems showed a high level of accuracy; the observed offsets between the virtual 3D visualization and the real phantom were below a clinically relevant threshold of 3 mm. Y1 - 2013 U6 - https://doi.org/10.1111/jce.12264 VL - 25 IS - 1 SP - 74 EP - 83 ER - TY - JOUR A1 - Meyer, Bernhard Christian A1 - Brost, Alexander A1 - Kraitchman, Dara L A1 - Gilson, Wesley D A1 - Strobel, Norbert A1 - Hornegger, Joachim A1 - Lewin, Jonathan S A1 - Wacker, Frank K T1 - Percutaneous punctures with MR imaging guidance: comparison between MR imaging-enhanced fluoroscopic guidance and real-time MR Imaging guidance JF - Radiology N2 - Purpose: To evaluate and compare the technical accuracy and feasibility of magnetic resonance (MR) imaging-enhanced fluoroscopic guidance and real-time MR imaging guidance for percutaneous puncture procedures in phantoms and animals. Materials and methods: The experimental protocol was approved by the institutional animal care and use committee. Punctures were performed in phantoms, aiming for markers (20 each for MR imaging-enhanced fluoroscopic guidance and real-time MR imaging guidance), and pigs, aiming for anatomic landmarks (10 for MR imaging-enhanced fluoroscopic guidance and five for MR imaging guidance). To guide the punctures, T1-weighted three-dimensional (3D) MR images of the phantom or pig were acquired. Additional axial and coronal T2-weighted images were used to visualize the anatomy in the animals. For MR imaging-enhanced fluoroscopic guidance, phantoms and pigs were transferred to the fluoroscopic system after initial MR imaging and C-arm computed tomography (CT) was performed. C-arm CT and MR imaging data sets were coregistered. Prototype navigation software was used to plan a puncture path with use of MR images and to superimpose it on fluoroscopic images. For real-time MR imaging, an interventional MR imaging prototype for interactive real-time section position navigation was used. Punctures were performed within the magnet bore. After completion, 3D MR imaging was performed to evaluate the accuracy of insertions. Puncture durations were compared by using the log-rank test. The Mann-Whitney U test was applied to compare the spatial errors. Results: In phantoms, the mean total error was 8.6 mm ± 2.8 with MR imaging-enhanced fluoroscopic guidance and 4.0 mm ± 1.2 with real-time MR imaging guidance (P < .001). The mean puncture time was 2 minutes 10 seconds ± 44 seconds with MR imaging-enhanced fluoroscopic guidance and 37 seconds ± 14 with real-time MR imaging guidance (P < .001). In the animal study, a tolerable distance (<1 cm) between target and needle tip was observed for both MR imaging-enhanced fluoroscopic guidance and real-time MR imaging guidance. The mean total error was 7.7 mm ± 2.4 with MR imaging-enhanced fluoroscopic guidance and 7.9 mm ± 4.9 with real-time MR imaging guidance (P = .77). The mean puncture time was 5 minutes 43 seconds ± 2 minutes 7 seconds with MR imaging-enhanced fluoroscopic guidance and 5 minutes 14 seconds ± 2 minutes 25 seconds with real-time MR imaging guidance (P = .68). Conclusion: Both MR imaging-enhanced fluoroscopic guidance and real-time MR imaging guidance demonstrated reasonable and similar accuracy in guiding needle placement to selected targets in phantoms and animals. Y1 - 2013 U6 - https://doi.org/10.1148/radiol.12120117 VL - 266 IS - 3 SP - 912 EP - 919 ER -