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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.