Medizinische Bildgebung. [Volume 7: Medical Imaging]. Ed. by Dössel, Olaf / Buzug, Thorsten M. Die bildgebenden Verfahren in der Medizin. Dössel, Olaf. Olaf Dössel. Prof. Dr. rer. nat. Olaf Dössel. Sprecher der kollegialen Bildgebende Verfahren in der Medizin II · Vorlesung. Lichttechnik-Hörsaal (LTI) External. – Buy Bildgebende Verfahren in der Medizin: Von der Technik zur medizinischen Anwendung book online at best prices in Olaf Dössel (Author).
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Therefore, in this paper, an alternate approach has been worked out to efficiently localize multiple catheter electrodes by considering the impedance between electrodes in the heart and electrode patches on the body surface.
Improvements by adding a single, subject specifically optimized electrode were similar to those of hildgebende BSPM: Electrocardiogram ECG criteria might provide a means to diagnose LAE and identify patients at risk; however, current criteria perform poorly.
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Restitution curves of the action potential duration and its slope, effective refractory period ERPconduction velocity, reentry wavelength WLand the vulnerable window VW were determined in a one-dimensional 1D tissue strand. The results mark an important step toward the reliable simulation of the vetfahren repolarization sequence, give a deeper understanding of the mechanism of atrial repolarization and enable further clinical investigations.
Books by Olaf Dössel
The efficacy of cardiac resynchronization therapy through biventricular pacing BVP has been demonstrated by numerous studies in patients suffering from congestive heart failure. In this work, we investigate the localization of simulated ischemic areas and ectopic foci and one clinical infarction case. In the outer k-space, the homogeneity requirement is relaxed to reduce the average SAR of the scan.
Left atrial fibrosis is thought to contribute to the manifestation of atrial fibrillation AF. Neue Artikel von diesem Autor. The clinical efficacy in preventing the recurrence of atrial fibrillation AF is higher for amiodarone bilgebende for dronedarone. Furthermore, a new approach to the analysis of HRT is proposed. In conclusion, the algorithm is suitable for handling varying P wave shapes and low signal-to-noise ratios. In such cases, a decoupling procedure would deliver a discriminated HRV analysis and possible new insights about the regulation of the cardiovascular system.
The enlargement dsssel the gating window can be translated into reduced dose requirements. Computer models of the heart can improve the understanding of the electrophysiological processes in healthy and diseased heart.
For this purpose, the transmembrane voltage distributions in the heart and the corresponding body surface potentials were computed with varying transmural extent of the ischemic region at different ischemia stages.
In this study, a new approach, called electric properties tomography EPT is presented. It is feasible to detect conduction gaps mddizin linear lesions with this catheter by evaluating electrogram data from mini electrodes. Also, low amplitudes in the imaged transmembrane voltages were found to correlate with volumes of scar and grey zone in delayed gadolinium enhancement cardiac MR.
Olaf Dössel (Author of Bildgebende Verfahren In Der Medizin)
The effects were more pronounced for mutation LP than for NK. Hence, more studies are warranted to decipher whether cells at the ALI are in general less vulnerable to NPs or specific NPs show different activities dependent on the exposure method.
The next challenge is the use of personalized atrial models in clinical practice. Motion compensated reconstruction using the derived motion vector fields leads to superior image quality compared to gated reconstruction.
Cardiac C-arm CT imaging delivers a tomographic region-of-interest reconstruction of the patient’s heart during image guided catheter interventions. For systematic comparison of this filter with standard filtering methods from the literature, we generated synthetic signals representing optical recordings from atrial myocardium of a rat heart with varying SNR. The study underlines the ability of ECG imaging to produce activation times of ventricular electric activity-and to represent effects of scar tissue in the imaged transmembrane voltages.
A tank model and a computerized realistic human model are employed to support the development of the positioning system. Using this approximation, three-dimensional in vivo conductivity and permittivity maps of the human brain are obtained in 5 bilrgebende 13 min, respectively, which can be considered a step toward clinical feasibility for Xer.
To evaluate two commonly used respiratory motion correction techniques for coronary magnetic resonance angiography MRA regarding their dependency on motion estimation accuracy and final image quality and to compare both methods to the respiratory gating approach used in clinical practice.
The most commonly used method to tackle this obstacle is Tikhonov regularization, which consists in converting the original problem into a well-posed one by adding a penalty term.
For all 22 cases at least one of the two bildgebemde determined phases yielded optimum quality. Cardiologists measure electric signals inside the human heart aiming at a cssel diagnosis and optimized therapy of atrial arrhythmias like atrial flutter and atrial fibrillation. As spline bunching and insufficient coverage can hardly be avoided, this has to be taken into account for interpretation of excitation patterns and development of new panoramic mapping techniques.
Using them some results were gained for the simulation of typical arrhythmias, in the field of validation using an animal model and for therapy planning with RF-ablation. Virtual electrograms were processed to compute phase singularity density maps to target rotor tips with up to three circular ablations. The results are compared with focal point image formation. Atrial modeling is currently in a transition from the sole use in basic research to future clinical applications.
Although some heterogeneities have been used in in-silico human atrial modeling studies, they have not been thoroughly investigated.