Signa infinity twinspeed with excite

CFD of these models was carried out using the incompressible fluid analysis module in Fujitsu α-Flow software (Fujitsu, Tokyo, Japan). We assumed that a non-Newtonian fluid property for blood and an elastic property of the vessel walls could be neglected. The simulations were performed with the material constants for blood density = 1055 kg/m³ and blood dynamics viscosity = 0.0049 Pa˙s. The governing equations were 3-dimensional incompressible unsteady Navier–Stokes equations. Each simulation was performed for 8 s. The boundary condition "velocity-inlet" was based on data from the patient with the aneurysm selected for modeling, acquired using a 3.0-Tesla MR scanner (Signa Infinity TwinSpeed with Excite [version 12]; GE Healthcare, Milwaukee, WI, USA) with a commercially available 8-channel head array coil. The pressure at the outlets was assumed to be zero at each time step. The grid points in the blood vessel and the aneurysm numbered about 500,000 in each simulation. The calculations were performed with the Fujitsu HPC2500 at the Information Technology Center of Nagoya University.

1.5T MR scanner (Signa Infinity Twin speed with Excite, GE Healthcare) with 8-channel neurovascular array coil and two 3T MR scanners (Signa HDx 3T, GE Healthcare and MAGNETOM Verio 3T, Siemens Healthcare) with 8- and 12-channel neurovascular array coils were utilized in image acquisition. Three ruptured and six unruptured aneurysms included in the study had been imaged using 1.5T MR scanner whereas 6 ruptured and 22 unruptured aneurysms had been imaged using 3T MR scanner with 8-channel neurovascular array coil. The other 3T MR scanner with 12-channel neurovascular array coil had been utilized in the image acquisition of one ruptured and 10 unruptured aneurysms in the study. The imaging parameters of 3D TOF MRA and 3D cine PC MRI are shown in Table 1.