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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Neuroimaging Clin N Am. 2011 May;21(2):285–301. doi: 10.1016/j.nic.2011.01.003

Figure 14.

Figure 14

Velocity-selective ASL (VS-ASL) mitigates CBF errors due to arterial arrival delays. Co-registered images from pulsed continuous ASL (pcASL) and VS-ASL are shown in a patient with Moyamoya disease and bilateral MCA occlusion. The pcASL images were obtained using a PLD of 2 s, which is too short to image the CBF in the high right frontal lobe. There is preserved ASL signal on the VS-ASL images in this region (arrows), suggesting that the errors associated with conventional ASL are reduced with this technique. Note the lower SNR in the VS-ASL images, which is largely due to the fact that the label images can only saturate rather than invert flowing blood.