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| Author(s): |
Carlos Ernesto Garrido Salmón
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) |
| Defense date: | 2005-02-25 |
| Examining board members: |
Alberto Tannus;
Dráulio Barros de Araújo;
Mario Engelsberg;
Claudio Jose Magon;
Said Rahnamaye Rabbani
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| Advisor: | Alberto Tannus |
| Abstract | |
Here we describe the development of a high performance radio-frequency/gradient coil integrated system for Magnetic Resonance Imaging. A saddle radio-frequency coil and a three-axis asymmetric local gradient coil composed this system. Two parameters were optimized in the RF coil design: signal-to-noise ratio and magnetic field uniformity. The current density of each local coil was optimized using stochastic numerical techniques, in order to generate a uniform magnetic field gradient by axis in a region representing a human head. The build gradient coil set has an inner diameter of 31 cm. The average gradient efficient of the three-axis is 25 mT/m/A and the maximum inductance is less than 310 mH. We show the clinical applications performed in three-dimensional and angiography imaging areas in a 0.5 Tesla magnetic resonance tomograph. These applications were optimized to taking advantage from the integrated system. Phantom images were acquired in less than 500 millisecond using echo planar techniques and the integrated set. Some aspects about static and homogeneous magnetic field characterization and correction are also commented. In this work we described solutions with wide technologic content close to the boundaries of the Applied Physics and Biomedical Engineering. (AU) | |
| FAPESP's process: | 00/10704-5 - Calculation, design and construction of RF and gradients for RMI with specific purposes |
| Grantee: | Carlos Ernesto Garrido Salmon |
| Support Opportunities: | Scholarships in Brazil - Doctorate |