MAGNETIC RESONANCE DIAGNOSTIC DEVICE AND IMAGING METHOD FOR MAGNETIC RESONANCE DIAGNOSIS

摘要

PURPOSE:To easily discriminate in a short time the flow direction of a fluid such as a blood flow, etc., in an MR angio. CONSTITUTION:At the time of selective excitation, in a transmitter 9, a high frequency of f0+ or -DELTAf is formed by a frequency converting part 23, based on a high frequency of frequencies f0, DELTAf of oscillating parts 20, 21. In this frequency, as for a high frequency of f0-DELTAf, its phase leads by 90 degrees by a phase converting part 25. A high frequency of f0+ or -DELTAf is modulated by amplitude modulating parts 26, 27, based on modulated waves F(t), G(t) from modulated wave generating parts 30, 31, added by an adding part 28, and thereafter, impressed to a body to be examined through a power amplifying part 29 and a high frequency coil 8. At the time of collecting a signal, a circuit to the phase converting part 25 is cut off, set to DELTAf=0 of the oscillating part 21, and only a high frequency of f0 is impressed to the coil 8, under the control of a controller. A receiver 10 contains a phase detecting part 42 corresponding to a phase difference of 90 degrees, and forms image data of a real part and an imaginary part.