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- Title
Automatic tuning and matching of a small multifrequency saddle coil at 4.7 T.
- Authors
Pérez de Alejo, Rigoberto; Garrido, Carlos; Villa, Palmira; Rodriguez, Ignacio; Vaquero, Juan José; Ruiz-Cabello, Jesús; Cortijo, Manuel
- Abstract
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. Magn Reson Med 51:869-873, 2004. © 2004 Wiley-Liss, Inc.
- Publication
Magnetic Resonance in Medicine, 2004, Vol 51, Issue 4, p869
- ISSN
0740-3194
- Publication type
Article
- DOI
10.1002/mrm.20045