# Numerical and workbench decoupling optimization of double-tuned (${}^{1}H/{}^{23}Na$) nested RF birdcage coils for MRI.

Fantasia M., Galante A., Maggiorelli F., Retico A., Fontana N., Monorchio A., Alecci M.

Comunicazione
V - Biofisica e fisica medica
GSSI Ex ISEF - Aula B - Mercoledì 25 h 16:30 - 19:00
The Double Tuned (DT) Radio Frequency birdcage coil is one of the most used configurations in Magnetic Resonance Imaging (MRI) to detect both the ${}^{1}H$ and X-nuclei signals but coupling between the two channels is a critical problem. For ${}^{1}H/{}^{23}Na$ at 2.35 T we studied the decoupling optimization of DT nested birdcages RF coils. We showed, using numerical and workbench tests, that a suitable geometrical selection of the two coaxial birdcages (relative angular orientation, diameters and lengths) and RF shield (diameter, length) allows a significant decoupling optimization, providing valuable information about the RF $B^{1}$ field homogeneity and efficiency.