Improved method and technique for monitoring SAR in transmit coils and arrays

With the advent of multi-channel transmitters, ultra-high field imaging and power-intensive techniques like Transmit SENSE, the need for real time power monitoring is becoming an important need. Recent studies have shown that current methods, (monitoring the forward and reflected power at the output of the amplifier) is insufficient as coupling and mismatched coils can change e-field and possibly SAR in transmit arrays. We are proposing a three-point method, monitoring the forward, reflected on the coax and, monitoring the field at the coil.

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