MR 画像において伝導性サンプルの受信感度に与える影響

概要

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A study was carried out on studied the effects of conductive samples regarding experimental receiving sensitivity on 0.5T magnetic resonance imaging (MRI) system and the adaptability of these results to clinical imaging. The relationship among the sample size, conductivity and inductive loss (magnetic loss) was taken up. For the 0.5T-MRI system, inductive loss was in proportion to the electric conductivity of the sample and to the fifth power of the sample radius. Furthermore, the second power of the signal-to-noise ratio (SNR) of the image was inversely proportional to the fifth power of the sample radius. These results agreed well with the theoretical formulations. In addition, the maximum and minimum receiving sensitivity of each radio-frequency (RF) coil could be calculated from the ratio of the inductive losses observed. The experimental results could be applied for clinical imaging. Values for the observed inductive losses in human subjects reflected the characteristics of the particular organ being evaluated, and also reflected the characteristics of the particular RF coils. Calculating the inductive loss value in reference to the particular body part allowed for practical estimation of the coil parameters, and was useful in assurance of image quality.
公益社団法人日本放射線技術学会の論文
1993-06-01