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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Expectedly, the case of unequal anisotropy ratios resulted in larger localization errors for almost all msdizin activation patterns. The presented technique is a robust method to determine and utilize local motion vector fields.

The results suggest that the presented in silico approach can complement experimental studies, e. Recent clinical studies have suggested intracardiac electrogram EGM criteria as verffahren promising marker to evaluate lesion development. Whole-chamber mapping using a pole basket catheter BC has become a featured approach for the analysis of excitation patterns during atrial fibrillation.

Medizinische Bildgebung

The general result is applied to free wire strain gauges, adhered foil strain gauges and thin film strain gauges. The healthy and remodeled model variants were compared with experimental bildyebende in single-cell, 1D and 2D tissue simulations to investigate action potential and restitution properties, as well as the bildgebenve of reentrant circuits. The method is tested on a dynamic software phantom, assessing reconstruction accuracy with respect to vessel radii and attenuation coefficients.

The other involves building computer models of the heart based on ion channels, bio-domain models and forward calculations to finally reach ECG and body surface potential maps. Spiral waves could be initiated by using mutation models as opposed to the control case. Die Behandlung dieser Gebiete bedarf einer separaten nachfolgenden Betrachtung.


On the other hand, with increasing field strength, adverse health effects must be expected: The prevalence of atrial fibrillation is increased in patients with end-stage renal disease.

Computational atrial models aid the understanding of pathological mechanisms and therapeutic measures in basic research. User Account Log in Bilgdebende Help. The correlation of 0.

Cardiologists measure electric signals inside the human heart aiming at a better diagnosis and optimized therapy of atrial arrhythmias like atrial flutter and atrial fibrillation. Perimitral flutter commonly occurs following ablation of atrial fibrillation and can be cured by an AML.

Targeting rotor sites with ablation did not stop reentries in the homogeneously remodelled atria independent from lesion size mm radiusfrom linearly connecting lesions with anatomical obstacles, and from the number of rotors targeted sequentially up to 3. In this paper, we present a method to quantitatively extract the wave direction and the local conduction velocity from one single beat in a circular mapping catheter signal.

Olaf Doessel – Google Scholar Citations

Verfqhren this work, we present a novel 3D compensation method in combination with a template-based correction that can be optimized over particular regions of interest to recover susceptibility-induced signal loss without acquisition time penalty. In addition to that, it was possible to determine the most probable conductivity values for a given BSPM signal. The obtained results confirm validation studies and suggest that cardiac anisotropy might be neglected in clinical applications of the considered EDL-based inverse procedure.


IEEE transactions on medical imaging 28 9, In tissue, spatial heterogeneous ischemia was described by central ischemic CIZ and border zone. The atrioventricular plane nedizin AVPD is considered to be a major contributor to the ventricular function, and a reduced AVPD is strongly related to heart failure. First results for electrocardiogram-gated reconstruction from clinical catheter-based rotational X-ray coronary angiography are presented. The mechanisms leading to and sustaining AF are not completely understood yet.

The simulation environment allowed varying both BC size and electrode arrangement. Intra-atrial excitation conduction was personalized manually from left atrial local activation time maps.

Both of these measures were computed automatically. Potential clinical applications are briefly outlined and future research perspectives are suggested.

The degree of superiority over the other investigated algorithms in terms of accuracy and robustness depended on the type of current.

Simulations were performed on a three dimensional setup including a geometrically detailed representation of the catheter with highly conductive dwsel. Virtual electrograms were processed to compute phase singularity density maps to target rotor tips with up to three circular ablations.

In past years, five models of human atrial electrophysiology with different formulations of ionic currents, and consequently diverging properties, have been published.

In this study, a new approach, called electric properties tomography EPT is presented. This model is based on the cellular automaton principle and utilizes anatomical data of the patient.

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