In this paper, a novel scheme based on the differential algebraic (DA) method is proposed to analyze the electron optics properties of the Wien filters. A new software package is then developed, to compute the geometrical and chromatic aberrations up to the fifth order of the Wien filters. For examples, the aberrations of single filter and the double filters are calculated. The calculated geometrical aberration coefficients are comparable with the counterpart calculated by Tang's theory. However, both theories can only match with each other in the calculation of the chromatic aberration coefficient when the dispersion ray is taken into consideration in Tang's theory.
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http://dx.doi.org/10.1016/j.ultramic.2019.112924 | DOI Listing |
Childs Nerv Syst
January 2025
Department of Neurosurgery, Medical University of Vienna, Währinger Gürtel 18-20, Wien, A-1090, Austria.
Purpose: The background of this scoping review is that pediatric neurosurgery in the vicinity of motor pathways is associated with the risk of motor tract damage. By measuring transcranial electrical evoked potentials in muscles (electromyogram) or from the spinal cord (epidural D-wave) functional disorders and impending damage can be detected during surgery and countermeasures can be initiated. The objective was to summarize stimulation techniques of transcranial electrical stimulation and the success rate of motor evoked potentials exclusively in children undergoing neurosurgery.
View Article and Find Full Text PDFEnviron Sci Technol
December 2024
Leibniz Institute for Baltic Sea Research Warnemünde, Rostock 18119, Germany.
NMR Biomed
January 2025
Support Centre for Advanced Neuroimaging, Institute for Diagnostic and Interventional Neuroradiology, University of Bern, Bern, Switzerland.
Spin-lock (SL) pulses have been proposed to directly detect neuronal activity otherwise inaccessible through standard functional magnetic resonance imaging. However, the practical limits of this technique remain unexplored. Key challenges in SL-based detection include ultra-weak signal variations, sensitivity to magnetic field inhomogeneities, and potential contamination from blood oxygen level-dependent effects, all of which hinder the reliable isolation of neuronal signals.
View Article and Find Full Text PDFBr J Anaesth
January 2025
Department of Anaesthesiology, University Hospital Basel and University of Basel, Basel, Switzerland.
J Biomed Inform
November 2024
TU Wien, Favoritenstrasse 9-11, Vienna, 1040, Austria.
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