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| The historical trend of MRI antennas (coils) development displays a discernible path of simple one-element coils created for transmission or reception followed by addition of image-quality enhancing features such as real-time frequency tuning, and then followed by creation of multiple-element array antennas. Receiver array antennas are widely used in modern MRI. In recent years, increasingly higher magnetic fields have been predominantly employed in MRI systems and therefore higher operating frequencies. RF field uniformity at sufficiently high frequencies is affected to a great degree by the electromagnetic properties of the tissue to be examined - it is not enough to have a good uniformity of the RF field when no examination subject is inside the coil. Also, a separate but related issue of excessive RF deposition level is a basis for great concern in need of resolution. A traditional fixed whole-body transmitter antenna does not suffice anymore. The need is growing for unified transceiver (simultaneously transmitter and receiver) array antennas capable of producing RF radiation patterns with desired qualities adapted to every examination subject at transmission, as well as independently at reception. Currently, the industry is at a threshold of transceiver array antenna products development. There is a number of outstanding issues: a need for image-enhancing features such as real-time frequency tuning capability incorporated into array antenna, and alike incorporation of preamplifier circuitry. Inclusion of these features and achievement of required flexibility in changing antenna properties through transition from reception mode to transmission and back to reception is not trivial. Patent #5,903,150 provides solution with appropriate antenna architecture designed to overcome the limitations imposed by existing technology, and well-suited for utilization in transceiver array antennas.903 150 transmission reception antennas Magnetic Resonance Imaging (MRI) apparatus Nuclear (NMR) images and/or calculating spectra examination subject |
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