Matthew P. Quinn1, Ravi S. Menon, 12
1Medical Biophysics, The University of Western Ontario, London, Ontario, Canada; 2Robarts Research Institute, London, Ontario, Canada
The goal of this study is to quantify diameters of veins visible with susceptibility-weighted sequences. A phantom was constructed wherein a Teflon tube filled with gadolinium solution was embedded in agarose and scanned at 3 T. Frequency was measured within the tube at different resolutions. The frequencies generated by this phantom were simulated, as were those generated by a vein in periventricular white matter. Phantom values were in agreement with corresponding simulation. In a volunteer, frequency measured in small periventricular veins is -0.750.31 Hz. Interpolation of simulated values yields diameters on the order of 200 μm for a 0.5x0.5x1.0mm3 voxel.