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Abstract #0027

High Precision Wireless Clock Recovery for On-Coil MRI Receivers Using Round-Trip Carrier Phase Tracking.

Arne Reykowski1, Paul Redder1, Rodrigo Calderon Rico1, Tracy Wynn1, Tim Ortiz1, Greg Dowling1, Randy Duensing2, and Scott B King1

1Invivo Corporation, Gainesville, FL, United States, 2Philips Research, Hamburg, Germany

Wireless MRI coils require a local frequency reference that is very tightly synchronized with the main MRI system clock. In order to keep phase encoding errors to less than 1 degree of phase at 3T, the local reference clock cannot drift by more than +/-22ps. Unlike RF cables or optical fibers, a wireless communication channel is not constant in phase over time. Patient motion and multi-path fading cause the wireless signal to be modulated in amplitude and phase. When disciplining a local clock with the MRI system clock by wireless means, channel impairments have to be monitored and corrected.

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