Decoupled coil detector array in magnetic resonance imaging

摘要

Abstract: A method for Magnetic Resonance Imaging (MRI) was investigated, whereby an object is put under a homogeneous magnetic field, and the image is obtained by applying inverse source procedures to the data collected in an array of coil detectors surrounding the object. The induced current in each coil due to the precession of the magnetic dipole in each voxel depends on the characteristics of both the magnetic dipole frequency and strength, together with its distance from the coil, the coil direction in space and the electrical properties of the coils. By calculating the induced current signals over an array of coil detectors, a relationship is established between the set of signals and the structure of the body under investigation. Based on the proposed method, a computer simulation demonstrates the feasibility of this new modality. An improved method of multicoil recording is also suggested, whereby it is combined with the conventional zeugmatographic method with read and phase gradients, to result in a novel method of magnetic resonance imaging. In the combined method an equivalent number of coils is used instead of encoding gradients. The number of coils is thus reduced many times in comparison with the method where only a multicoil array is used. An experimental setup with a 9 coils detector array was built to give a coarse resolution of 3$MUL@3 pixels. By measuring the induced current signals over this array of coil detectors, a relationship is established between the set of signals and the structure of the body under investigation. The linear relation can then be represented in matrix notation, and inversion of this matrix will produce an image of the body.!