title: Cerebral venous and arterial blood volumes can be estimated separately in humans using magnetic resonance imaging.
abstract: Approaches to obtain quantitative, noninvasive estimates of total cerebral blood volume (tCBV) and cerebral venous blood volume (vCBV) separately in humans are proposed. Two sequences were utilized, including a 3D high-resolution gradient-echo (GE) sequence and a 2D multi-echo GE/spin-echo (MEGESE) sequence. Images acquired by the former sequence provided an estimate of background magnetic field variations (DeltaB), while images obtained by the latter sequence were utilized to obtain separate measures of tCBV and vCBV with and without contrast agent. Prior to the calculation of vCBV and tCBV, the acquired images were corrected for signal loss induced by the presence of DeltaB. vCBV and tCBV were estimated to be 2.46% +/- 0.28% and 3.20% +/- 0.41%, respectively, after the DeltaB correction, which in turn provided a vCBV/tCBV ratio of 0.77 +/- 0.04, in excellent agreement with results reported in the literature. Our results demonstrate that quantitative estimates of vCBV and tCBV can be obtained in vivo.
mesh_terms: D001810:Blood Volume; D002536:Cerebral Arteries; D002550:Cerebral Veins; D002560:Cerebrovascular Circulation; D003287:Contrast Media; D006801:Humans; D021621:Imaging, Three-Dimensional; D008279:Magnetic Resonance Imaging / Q000379:methods*
chemical_list: D003287:Contrast Media