Data acquisition and image reconstruction tasks of METU Magnetic Resonance Imaging (MRI) System are used to be performed by a 15 year-old technology. This system is incapable of transmitting control signals simultaneously and has memory limitations. Control software is written mostly in assembly language, which is hard to modify, with very limited user interface functionality, and time consuming. In order to improve the system, a LabVIEW based data acquisition system consisting of a NI-6713 D/A card (to generate RF envelope, gradients, etc.) and a NI-6110E A/D card (to digitize echo signals) from National Instruments is programmed and integrated to the system, and a pulse sequence design, data acquisition and image reconstruction front-end is designed and implemented. Apart from that, a new method that can be used in Magnetic Resonance Current Density Imaging (MRCDI) experiments is proposed. In this method the readily built gradient coil of the MRI scanner is utilized to induce current in the imaging volume. Magnetic fields created by induced currents are measured for various amplitude levels, and it is proved that inducing current with this method is possible.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12606662/index.pdf |
| Date | 01 October 2005 |
| Creators | Ozsut, Murat Esref |
| Contributors | Eyuboglu, Murat B |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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