Automatic tuning and matching of a small multifrequency saddle coil at 4.7 T
| Autor: | Pérez de Alejo, Rigoberto, Garrido, Carlos, Villa, Palmira, Rodriguez, Ignacio, Vaquero López, Juan José, Ruiz Cabello, Jesús, Cortijo, Manuel |
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| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | e-Archivo. Repositorio Institucional de la Universidad Carlos III de Madrid instname |
| Popis: | A new circuit design for automatically tuning and matching a saddle coil for small animal imaging is presented. This design allows working at 1H, 19F, and 3He resonance frequencies in a 4.7 T spectrometer. It is based on a balanced circuit with commercial variable capacity diodes controlled by a computer using digital potentiometers. The change between two different frequencies can be accurately performed in a few seconds. System Q is compared, between 140–210 MHz, to the same coil tuned and matched with high Q variable capacitors. Differences lower than 5% were found with a loaded coil. The proposed design has initially been evaluated in 19F and 1H NMR images acquired with a five-tube phantom. An application is also shown for the acquisition of 3He, 19F, and 1H lung images in a control rat Publicado |
| Databáze: | OpenAIRE |
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