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340 results on '"Meierhofer, Christian"'

5. Bioelectric Registration of Electromagnetic Tracking and Preoperative Volume Data

Author

Ramadani, Ardit, Maier, Heiko, Bourier, Felix, Meierhofer, Christian, Ewert, Peter, Schunkert, Heribert, and Navab, Nassir

Subjects
Physics - Medical Physics
Abstract

For minimally invasive endovascular surgery, the localization of catheters and guidewires inside the human body is essential. Electromagnetic (EM) tracking is one technology that allows localizing such surgical instruments. For localizing intra-operatively EM-tracked instruments with respect to preoperative volume data, it is necessary to bring pre- and intraoperative imaging into the same coordinate frame. In most existing solutions, such registration requires additional interactions, modifying the procedure's original workflow. We propose a new method taking advantage of Bioelectric signals to initialize and register preoperative volumes to the EM tracking system without significantly changing the interventional workflow. We envision the most natural use-case of our concept in cardiac electrophysiology (EP) procedures, in which EP catheters are already equipped with all the necessary sensing, including electric sensing for the measurement of electrophysiological signals and EM tracking for catheter localization. We use EP catheters for Bioelectric sensing to detect local features of the vasculature while advancing the catheter inside the human body. Such features can be automatically labeled before the procedure within the preoperative data. The combination of Bioelectric and EM tracking can localize vascular features such as bifurcations and stenosis within the EM tracking space. Mapping them to preoperative data automatically registers patients' CT space to EM tracking. The proposed registration process is entirely based on Bioelectric sensed features, with no need for external markers or other interventional imaging devices., Comment: 10 pages, 2 figures, 1 table, proof-of-concept study

Published
2022

21. Long-Term Survival Is Superior in Patients With Pulsatile Pulmonary Flow After the Björk Procedure

Author

Klemm, Lukas, Schaeffer, Thibault, Heinisch, Paul Philipp, Staehler, Helena, Röhlig, Christoph, Meierhofer, Christian, Piber, Nicole, Hager, Alfred, Ewert, Peter, Hörer, Jürgen, and Ono, Masamichi

Abstract

Background:This study aims to evaluate clinical outcomes and hemodynamic variables late after the Björk procedure, regarding the pulmonary flow pattern. Methods:Patients who survived more than 15 years after the Björk procedure were included and then divided into two groups according to their pulmonary flow pattern by pulsed-wave Doppler assessment of echocardiography: patients with pulsatile systolic pulmonary flow (Group P) and those without (Group N). Results:A total of 43 patients were identified, of whom 13 patients were divided into Group P and 30 in Group N. Median age at the Björk procedure was 5.7 (2.1-7.3) years, and median follow-up was 32 (28-36) years. Survival after 15 years was higher in Group P, compared with Group N (100% vs 76% at 30 years, P= .045). Cardiac catheterization data demonstrated higher cardiac index in Group P patients compared with Group N patients (3.5 vs 2.8 L/m2, P= .014). Cardiac magnetic resonance imaging study revealed that Group P patients had higher right ventricular end-diastolic volume index (96 vs 57 mL/m2, P= .005), higher end-systolic volume index (49 vs 30 mL/m2, P= .013) and higher right ventricular stroke volume index (48 vs 25 mL/m2, P< .001), compared with Group N patients. Exercise capacity tests demonstrated that Group P patients showed a higher percent predicted peak oxygen consumption, compared with Group N patients (73 vs 58%, P< .001). Conclusions:Late after the Björk procedure, patients with a pulsatile systolic pulmonary flow had a larger right ventricle and better exercise capacity compared with those without pulsatile systolic pulmonary flow.

Published
2024
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33. The relation of aortic dimensions and obesity in adults with Marfan or Loeys-Dietz syndrome

Author

Suleiman, Mathieu N., primary, Freilinger, Sebastian, additional, Meierhofer, Christian, additional, May, Matthias, additional, Bischoff, Gert, additional, Ewert, Peter, additional, Freiberger, Annika, additional, Huntgeburth, Michael, additional, Kaemmerer, Ann-Sophie, additional, Marwan, Mohamed, additional, Nagdyman, Nicole, additional, Roth, Jan-Peter, additional, Kaemmerer, Harald, additional, Weyand, Michael, additional, and Harig, Frank, additional

Published
2022
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45. Bioelectrical Impedance Analysis as a Contemporary Biomarker of Obesity in Adults with Marfan- or Loeys-Dietz-Syndrome

Author

Freilinger, Sebastian, primary, Suleiman, Mathieu N., primary, Bischoff, Gert, primary, Ewert, Peter, primary, Freiberger, Annika, primary, Huntgeburth, Michael, primary, Kaemmerer, Ann-Sophie, primary, Schopen, Judith, primary, Meierhofer, Christian, primary, Nagdyman, Nicole, primary, Kaemmerer, Harald, primary, Weyand, Michael, primary, and Harig, Frank, primary

Published
2022
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