Icon System Manual T02985_02_03 77
MRI System Operation
5.2.6 Tuning of RF Coils
Depending on the type of the RF Coil, tuning and matching of the coil
1)
is required when
the load of the sample has changed between consecutive imaging or spectroscopy
studies.
Correct tuning and matching reduces the reflection of RF power during transmission and
increases the sensitivity (SNR) during signal reception. It is therefore most important for
the coil receiving the signal and less for the transmission coil in a cross coil
configuration
2).
Tuning and matching of a RF Coil needs to be performed exactly with the sample and
setup that is used when scanning. The so called “wobble curve” is displayed on the RF
interface display as soon as the wobble process has been started in ParaVision. The
example below shows different situations:
The RF Coil is correctly tuned and well matched
The RF Coil is detuned (off-resonant), but well matched =>
change the tuning of the coil
TH RF Coil is tuned (on-resonant), but miss-matched => change
the matching of the coil
Please check the coil-specific user manual for dedicated procedures that are not
described in this manual.
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