Decoupled coil detector array in magnetic resonance imaging

Doron Kwiat; Shmuel Einav

doi:10.1117/12.43429

1 July 1991 Decoupled coil detector array in magnetic resonance imaging

Doron Kwiat, Shmuel Einav

Proceedings Volume 1443, Medical Imaging V: Image Physics; (1991) https://doi.org/10.1117/12.43429
Event: Medical Imaging '91, 1991, San Jose, CA, United States

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 3X3 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.

Citation Download Citation

Doron Kwiat and Shmuel Einav "Decoupled coil detector array in magnetic resonance imaging", Proc. SPIE 1443, Medical Imaging V: Image Physics, (1 July 1991); https://doi.org/10.1117/12.43429

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KEYWORDS

Signal detection

Sensors

Magnetism

Medical imaging

Signal to noise ratio

Detector arrays

Magnetic resonance imaging

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