Abstract #1995

Parallel Transmit Vessel Selective Arterial Spin Labelling: Phantom and In-Vivo Results

Aaron Oliver-Taylor¹, Chris Randell², Roger J. Ordidge³, David L. Thomas⁴

¹Department of Medical Physics and Bioengineering, University College London, London, England, United Kingdom; ²PulseTeq Products Division, Renishaw PLC, United Kingdom; ³Centre for Neuroscience, University of Melbourne, Melbourne, Victoria, Australia; ⁴Institute of Neurology, University College London, London, England, United Kingdom

Vessel selective continuous arterial spin labelling can be achieved using a single surface coil placed over one of the carotid arteries. However the labelling B₁ field extends across the neck causing contralateral labelling. Presented is a method using parallel transmission to nullify the B₁ field at the contralateral artery. Both phantom and in-vivo results show a reduction in contralateral labelling is possible, improving specificity without losing the advantageous high labelling efficiency and no magnetisation transfer effects of separate-coil CASL.