This work presents the method of achieving ideal decoupling between elements in a receive coil array. Generally, preamplifier decoupling is limited by nonidealities of the implemented components. It is shown analytically and numerically, that for the ideal (lossless) matching circuits the input resistance of the preamplifier should be zero, while for the realistic lossy case a small negative resistance can be used to achieve ideal decoupling. Here we use a negative input resistance preamplifier (NIRP) to compensate for the loss of the circuit. The analysis is verified experimentally showing a decoupling of -62 dB when a NIRP with an input resistance of -0.023 ? is used.
|Number of pages||2|
|Publication status||Published - 2018|
|Event||Joint Annual Meeting ISMRM-ESMRMB 2018 - Paris Expo Porte de Versailles, Paris, France|
Duration: 16 Jun 2018 → 21 Jun 2018
|Conference||Joint Annual Meeting ISMRM-ESMRMB 2018|
|Location||Paris Expo Porte de Versailles|
|Period||16/06/2018 → 21/06/2018|
Johansen, D. H., Sánchez-Heredia, J. D., Zhurbenko, V., & Ardenkjær-Larsen, J. H. (2018). Ideal Coil Decoupling in Receive Arrays using Negative Resistance Preamplifiers. Paper presented at Joint Annual Meeting ISMRM-ESMRMB 2018, Paris, France.