Loading...
Please wait, while we are loading the content...
Application de la méthode des moments à l'analyse et à la conception de micro et de mini sondes IRM.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Benabdallah, Nadia |
| Copyright Year | 2014 |
| Abstract | This work is characterized by the use of two numerical methods in two dimensions. The first one is the method of moments (MoM) which, under LINPAR environment, allowed us the determination of the electromagnetic parameters of NMR resonators at high frequencies. The second one is the finite element method (MEF) which allowed us, under FLEXPDE environment, the evaluation of the magnetic field distribution created inside these resonators. The studied resonators serve as inductors in NMR probes circuits, having as disadvantage of very complex forms which make difficult (see impossible) the analytical resolution of their electromagnetic parameters. The completed work is summarized in the following points: The characterization of the electromagnetic parameters of the birdcage resonator (BCR) using coupled microstrip and coupled coaxial lines. The design and the simulation of an NMR probe operating at 200 MHz (proton imaging at 4.7 T) and using birdcage resonator constituted by eight-coaxial lines while improving its electric characteristics. The characterization of the electromagnetic parameters of the shielded slotted tube resonator (STR) with circular cross section. The research of the optimal structure of the slotted tube resonator with circular cross section providing a very good homogeneity of the magnetic field generated inside this resonator. The design and the simulation of an NMR probe using the optimal structure of the slotted tube resonator with circular cross section and operating at 500 MHz (NMR at 11.74 T). The characterization of the electromagnetic parameters of the shielded slotted tube resonator with elliptical cross section (SER). The design and the simulation of an NMR probe using an optimal structure of the shielded slotted tube resonator with elliptical cross section and operating at 300 MHz (NMR at 7 T). The designed NMR probes present strong quality coefficients which exceed 500. The NMR resonators studied in this work, were the subject of three international publications. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://dspace.univ-tlemcen.dz/bitstream/112/4236/1/These_BENABDALLAH_NADIA.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
