| 摘要 |
Four QD surface coil assemblies each constituted by an 8-shaped coil and a rectangular coil are one-dimensionally arranged under the spine array of a patient in the direction of the body axis of the patient. Each 8-shaped coil senses an RF magnetic field in an x direction near the spine array of the patient, and each rectangular coil senses an RF magnetic field in a y direction. Outputs from the 8-shaped coils and the rectangular coils are input to 90 DEG hybrid combiner circuits through pre-amplifiers, the phase of any one of the outputs is shifted by 90 DEG , and then the outputs are added to each other. Outputs from the 90 DEG hybrid combiner circuits are supplied as raw data, through receiver/data acquisition systems, to a data processing unit (computer). In the data processing unit, raw data are two-dimensionally Fourier-transformed to form image signals pi(x,y,z) (i=1 to 4). The signals p1(x,y,z) are squared, the sum of pi(x,y,z) is calculated with respect to i, and finally, the square root of the sum is calculated to obtain an image.
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