Aleksandra Maria Stankiewicz1,2, Ona Wu2, Thomas Benner2, Robert E. Irie2, Tracy T. Batchelor2, A Gregory Sorensen2
1Harvard University, Cambridge, MA, United States; 2Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Boston, MA, United States
Perfusion-weighted Magnetic Resonance (MR) Imaging is used to assess the risk of tissue infarction in acute stroke patients and tumor angiogenesis in cancer patients. We compared circular global arterial input function (AIF) and local AIF algorithms, recently proposed automated methods for MR signal deconvolution. 13 patients with 2 MR scans within 48 hours were studied. The variation between global AIF cerebral blood flow (CBF) maps from the first and second scans was 0.220 0.043, and between local AIF CBF maps was 0.263 0.041 (P-value = 0.0015). Superior repeatability of global AIF-based CBF maps may be important in speedy diagnosis and risk stratification.