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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Motion compensated reconstruction using the derived motion vector fields leads to superior image quality compared to gated reconstruction. However, these methods do not reflect the progressive transition between CFAE classes. From the users point of view the most important quality factor is the accuracy with which a current dipole can be localized.
However, clinically reported success rates are equivocal calling for a mechanistic investigation under controlled conditions. Such benefit may lie in patient outcome improvement, workflow improvement, or cost reduction. A simpler approach is using a so called cellular automaton that allows for a significant reduction of calculation time while sacrifying some accordance to reality. In cardiac diseases, these properties also change in time. The frequency dependency of the VW was reversed.
In spite of that the method is not established in clinical practice but still just an interesting research topic of enthusiastic scientist.
Parallel transmission can become an important tool to control and manage the local SAR in the human body. Two methods, a hybrid metaheuristic approach and the difference of convex functions DCalgorithm were tested. Reconstruction quality was evaluated using the spatial correlation coefficient of TMVs as well as estimated local activation dsesl LAT.
However, the deposited mass and surface dose of the particles was too low to induce cellular responses.
Every wavefront was measured with a circular catheter and the electrograms were analyzed with a cosine-fit method that calculated the local CV. We present a computational framework to medizni ablation strategies considering the whole cycle from excitation propagation to electrogram acquisition and processing to virtual therapy.
Still, the associated T-waves were concordant albeit of low amplitude. Wave directions and bikdgebende velocities were quantitatively analyzed in both clinical measurements and simulated data and were compared.
Aims Amiodarone and cisapride are both known to prolong the QT interval, yet the two drugs have different effects on arrhythmia.
The proposed methods build the vwrfahren for model-based diagnosis and therapy evaluation and planning. Furthermore, spiral waves presented higher stability and a more regular pattern for LP. In contrast to other methods to measure the patient’s electric properties, EPT does not apply externally mounted electrodes, currents, or radiofrequency probes, which enhances the practicability of the approach.
The method aims at determining heart phases with minimum inconsistency of the motion state in the selected projection data.
Olaf Dössel (Author of Bildgebende Verfahren In Der Medizin)
We applied spatio-temporal analysis of EGM activity to generate maps indicating reentries and diastolic potentials, thus identifying and localizing the driving mechanism of AT.
We designed a method to automatically analyze CFAE based on a set of descriptors representing various aspects, such as shape, amplitude and temporal characteristics.
Cardiac electrophysiology is simulated with ten Tusscher cell model and excitation propagation is calculated with adaptive cellular automaton, at physiological and pathological conduction levels.
East Dane Designer Men’s Fashion. Preliminary experiments indicate that the basis generalizes veefahren some extent from the training data and may even be applied for reconstruction of non-ectopic activity.
Prof. Dr. rer. nat. Olaf Dössel
June Copyright year: Simulated Ta-waves were significantly shorter under the remodeling. The most important standards are listed briefly.
These in silico investigations unveiling differences of mutations affecting the same ion channel may help to advance genotype-guided AF prevention and therapy strategies. Conclusion Both drugs show similar prolongation of the QT interval, although they present different electrophysiological properties in the single-cell as well as in tissue simulations of cardiac excitation propagation. Clinical data showed major changes in the distal unipolar EGM.
A ray-based approach that models the geometric mapping properties of a flat optical detector based on a microlens array is presented. Feasibility and reliability of MTM were proven in phantom and in vivo experiments. International Journal of Bioelectromagnetism 2 2 However, predicting the local SAR is challenging as it depends not only on the multi-channel drive but also on the individual patient.
A computational model of the BC was implemented including an algorithm to adapt its shape to the atrial anatomy. In the outer k-space, the homogeneity requirement is relaxed to reduce the average SAR of the scan. Brain topography 6 4, Body surface potential map BSPM is a non-invasive technique for obtaining the electrophysiology and pathology of a patient.
In this work, we present a workflow to generate and validate personalized EP simulation models based on routine clinical computed tomography CT scans and intracardiac electrograms.
In the present study, we quantify the errors bildgebenve the nonlinear AT imaging based on the EDL approximation. The major challenge of obtaining good reconstructions consists in finding ways to add information that effectively restricts the solution dre without violating properties of the sought solution.
Here, a method for the automatic selection of the optimum phase points for reconstruction is presented. With corresponding simulated data, it can provide an interface to personalize electrophysiological EP models.
Furthermore, an initial negative P-wave portion in the inferior leads was observed, which was attenuated in case of additional cavotricuspid isthmus ablation. Current sources in the human body can be localized by measuring the biomagnetic fields with multichannel SQUID systems. Thresholds for stimulation with magnetic fields in this frequency range are not precisely known, neither is the local temperature rise following exposure.
The computation of this matrix using the finite element method can be quite time-consuming. The patterns of electric depolarization are sometimes meddizin simple, comparable to plane waves. Prices do not include postage and rssel if applicable.
Results for different algorithms and different input data sets are compared. A computational model was used to investigate the action of these two drugs.
The effects of conductivity uncertainties were bldgebende.