Noise wave analysis of Dicke and noise injection radiometers: Complete S-paramater analysis and effect of temperature gradients

Author(s):  
A. Camps

2018 ◽  
Vol 2018 (7) ◽  
pp. 5219-5228
Author(s):  
Ananda Shankar Bhattacharjee ◽  
Sha Wu ◽  
Ramesh Goel


2005 ◽  
Vol 50 (3) ◽  
pp. 490-498 ◽  
Author(s):  
V. I. Strelov ◽  
B. G. Zakharov ◽  
V. S. Sidorov ◽  
I. Zh. Bezbakh ◽  
V. I. Folomeev


1975 ◽  
Vol 14 (3) ◽  
pp. 716 ◽  
Author(s):  
F. Reitmayer ◽  
H. Schroeder


2018 ◽  
Vol 548 ◽  
pp. 421-428 ◽  
Author(s):  
Anne M. Benneker ◽  
Timon Rijnaarts ◽  
Rob G.H. Lammertink ◽  
Jeffery A. Wood


1994 ◽  
Vol 16 (3) ◽  
pp. 253-257 ◽  
Author(s):  
N.P. Ghildyal ◽  
M.K. Gowthaman ◽  
K.S.M.S. Raghava Rao ◽  
N.G. Karanth


2018 ◽  
Author(s):  
Guy Malki ◽  
Sharon Zlochiver

ABSTRACTCardiac rotors are believed to be a major driver source of persistent atrial fibrillation (AF), and their spatiotemporal characterization is essential for successful ablation procedures. However, electrograms guided ablation have not been proven to have benefit over empirical ablation thus far, and there is a strong need of improving the localization of cardiac arrhythmogenic targets for ablation. A new approach for characterize rotors is proposed that is based on induced spatial temperature gradients (STGs), and investigated by theoretical study using numerical simulations. We hypothesize that such gradients will cause rotor drifting due to induced spatial heterogeneity in excitability, so that rotors could be driven towards the ablating probe. Numerical simulations were conducted in single cell and 2D atrial models using AF remodeled kinetics. STGs were applied either linearly on the entire tissue or as a small local perturbation, and the major ion channel rate constants were adjusted following Arrhenius equation. In the AF-remodeled single cell, recovery time increased exponentially with decreasing temperatures, despite the marginal effect of temperature on the action potential duration. In 2D models, spiral waves drifted with drifting velocity components affected by both temperature gradient direction and the spiral wave rotation direction. Overall, spiral waves drifted towards the colder tissue region associated with global minimum of excitability. A local perturbation with a temperature of T=28°C was found optimal for spiral wave attraction for the studied conditions. This work provides a preliminary proof-of-concept for a potential prospective technique for rotor attraction. We envision that the insights from this study will be utilize in the future in the design of a new methodology for AF characterization and termination during ablation procedures.



2017 ◽  
Vol 31 (4) ◽  
pp. 04017011 ◽  
Author(s):  
Mingyi Zhang ◽  
Xiyin Zhang ◽  
Shuangyang Li ◽  
Jianguo Lu ◽  
Wansheng Pei


2007 ◽  
Vol 5 (2) ◽  
pp. 104-115 ◽  
Author(s):  
Paul S. Steif ◽  
Matthew C. Palastro ◽  
Yoed Rabin




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