Abstract #3645

Arterial Spin Label CBF Maps Can Show Abnormalities in Clinical Patients with Normal Bolus Perfusion-Weighted Imaging: Identification of the "Watershed Sign"

Greg Zaharchuk¹, Ajit Shankaranarayan², Roland Bammer¹, Matus Straka¹, David C. Alsop³, Nancy J. Fischbein⁴, Scott W. Atlas⁴, Michael E. Moseley¹

¹Department of Radiology, Stanford University, Stanford, CA, USA; ²Appled Sciences Laboratory - West, GE Healthcare, Menlo Park, CA, USA; ³Department of Radiology, Beth Israel Deaconess Hospital, Boston, MA, USA; ⁴Department of Radiology, Stanford University Medical Center, Stanford, CA, USA

ASL imaging is very sensitive to arterial arrival times and can detect abnormalities in patients with normal bolus PWI studies, the most common of which we have termed the watershed sign.