A Setup for Continuous Arterial Spin Labeling with a 4 Channel Radiative Labeling Coil Allowing for High Duty Cycle Labeling at 7T

Wouter Koning¹, Johanneke H. Bluemink¹, Esben Petersen¹, Alexander Raaijmakers¹, Anke Henning², Cornelis A.T. van den Berg¹, Jaco Zwanenburg¹, Peter Luijten¹, Dennis W

A setup is presented for the use of radiative antennas as external labeling coils for cASL at 7T. Four radiative antennas attached to a neck pillow filled with heavy water are used to create a B1 field in the neck. This neck pillow can be used in combination with a head coil for labeling during ASL experiments. SAR calculations show that using this setup labeling pulses for cASL can be used with a factor 5.5 longer duration than is allowed with the use of the head coil, while remaining within SAR safety guidelines.