Meeting Banner
Abstract #2794

A Double-Shielded Label Coil for Continuous Arterial Spin Labeling at 7 T

Wolfgang Driesel1, Roland Mller1, Andreas Schfer1, Markus Streicher1, Carsten Kgler1, Toralf Mildner1, Harald E. Mller1

1Max Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Germany

At frequencies above 150 MHz, shielded loop coils become impractical because capacitive tuning is no longer possible. The integration of a floating secondary shield allows adaptation of this design to higher magnetic fields. Simulations and initial experiments suggest that a double-shielded dual-loop coil may be used for continuous arterial spin labeling at the human neck at 7 T within legal SAR limits.

Keywords

absorption achieved acts actual additional adjusting agreement allows amplifier application arrangement arterial arteries attenuation becomes bench black brain called capacitance capacitive capacitors carotid chosen circuit cognitive coil combined compute computed computer concept concepts conditions consideration consists continuous copper curves decoupling design designer diameter dielectric diodes disconnect distorted distributions double dual easily efficient employed engineering equipped excellent excitation experimental feed feeding fields floating frequencies frequency goal gradient head heat heating human impedance impractical indicated inductive initial input inside institute insulation integrated integration label labeling legal limits longer loop loops lowest made maps matching material maxwell measured mode modes neck network numerical operation opposite output outside pair periods permits perpendicular phantom ports positions power problem profiles properties proposed recalled receiver recently recorded required rigid safe scanner secondary semi sensitivity shield shielded shrink simulated simulation simulations slightly solution spin sufficiently suggest switch temperature thick tissue towards transmission transmit transmitter tubing tune tuned tuning vertebral