Image reconstituting method in nmr imaging

Abstract

Abstract PURPOSE:To decrease not only vibration to one half while increasing a cycle to two times, by a method wherein the signal group from the positive part of a waveform and the signal group from the negative part thereof are subjected to Fourier transform while the second inclined magnetic field is applied to the first inclined magnetic field in the direction vertical to said first one and the corresponding terms are mutually multiplied by a complex number and the multiplication result is subsequently subjected to Fourier transform. CONSTITUTION:Inclined magnetic field generating coils 4X, 4Y, 5 respectively generate inclined magnetic fields in X-, Y- and Z. directions and a current flows to the inclined magnetic field generating coils 5 in mutually reverse directions. The echo generated when inclined magnetic fields are applied positively and a negative echo are simultaneously used to reconstitute an image and, by this reconstitution, the request to the vibration of a vibrated inclined magnetic field is further reduced by half. By simultaneously using the data points arranged on a right-handed upward straight line and the data points arranged on the left-handed upward straight line in the analysis of spatial frequency, even when the amplitude of the vibrated inclined magnetic field is half, that is, GX=MGY is formed, an accurate image is constituted. Herein, GX is the amplitude of the vibrated inclined magnetic field, GY is the amplitude of a stationary inclined magnetic field and M is the size of an image matrix.

Inventors

• 👤 Kensuke Sekihara
• 👤 Shigeru Matsui
• 👤 Hideki Kono

Bibliographic Details