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2 Contact heike.theessen@siemens.com kevin.royalty@siemens.com Time intensity curves from a ROI in the ischemia 3 Pre-revascularization Post-revascularization syngo iFlow shows very slow flow in the M2 and M3 branches of the right MCA with some branches filling 12.5 sec. or more after start of the acquisition. In this image the TTP in all anterior cerebral and posterior cerebral branches is in the range between 2 and 3.5 sec.. The TTP in the MCA branches is significantly longer with values ranging between 6.5 and 12.5 sec. or longer. These values correlate well with the differences in tissue TTP seen on the PCT scan. 2 The pre-revascularization TIC shows that the TTP in the ischemic tissue included in the ROI occurs about 9 sec. after start of the acquisition. Following revascularization this value decreases to about 6 sec.. Following treatment contrast washes out of the ROI much faster than it did prior to revascularization. The syngo iFlow image and these curves give an operator insights into tissue perfusion which cannot be extracted visually from the standard 2D DSA acquisition. 3 Stroke Angiography AXIOM Innovations | December 2013 | www.siemens.com/angiography  23


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