Patent ID: 6819104
Filing Date: 2004-11-16
Classification: G01R

Abstract:
An MRI system comprising:a transmitter coil that transmits a radio-frequency (RE) pulse; a gradient coil unit that applies magnetic field gradients; a receiver coil that receives an NMR signal; a scanning unit configured to: acquire information by driving said transmitter coil, gradient coil unit, and receiver coil; repeat information acquisition in steady-state free precession (SSFP) N times by sequentially changing a phase for phase encoding until a first data set fv (k) ranging from data fv (0) to data fv (Nâˆ’1) is acquired from views v; and simultaneously during the acquisition vary a phase of the RF pulse according to an expression 360Â°Â·vÂ·/N, wherein N denotes a power of 2; and a data processing unit configured to: perform arithmetic operations on the information; generate a second data set Fv1(n) by performing a Fourier transform on the first data set fv(k) relative to each phase indicated by the RF pulse, wherein said Fourier transform is performed if an operator designates Fourier transform imaging, use the first data set fv(k) as a third data set Fv2(n) if the operator does not designate Fourier transform imaging; receive a selection from the operator whether a root-mean-square-conversion is to be performed on one of the second and third data sets; perform the root-mean-square-conversion on one of the second and third data sets to produce a fourth data set if the operator selects the root-mean-square-conversion; and perform one of weighted addition and maximum intensity projection on one of the second and third data sets to generate a fifth data set if the operator avoids selecting the root-mean-square conversion; and reconstruct an image from one of the fourth and fifth data sets.