Visual rating of DSC-CBF/ASL.

Results of the visual qualitative analysis. As hypoperfusion in ASL occurred exclusively as part of ATDA and not isolated, for ASL only the categories ATDA and normal are presented.Rows show imaging findings for ASL-CBF, columns show imaging findings for DSC-CBF. Patients rated uninterpretable were excluded.Of 11 patients with hypoperfusion in DSC-CBF, 9 patients showed ATDAs in ASL (specificity: 82%; false negative rate: 18%). 6 patients had normal DSC-CBF findings, 3 of them showed ATDAs in ASL (false positive: 50%).DSC-CBF: Dynamic Susceptibility Contrast - Cerebral Blood Flow; ASL: Arterial Spin Labeling; ATDA: Arterial Transit Delay Artifact.