Territorial Arterial Spin Labeling by Using Asymmetrically RF-shimmed Labeling Pulse with 4-channel RF Transmit at 3T

Territorial ASL (tASL) using asymmetrically RF-shimmed labeling pulse was proposed. By using 4-channel RF transmit coil, spatially asymmetric transmission was applied to pCASL pulse. Proposed method does not require longer duration of RF pulse. Also, by using knowledge of B₁ map, appropriate scaling was applied to the tASL image, and labeling efficiency was consistent between nonselective ASL and tASL. Proposed method was implemented to a 3T MRI system, and demonstrated tASL in-vivo by a volunteer study. tASL of RICA, LICA, and VBA was imaged.