4.常伝導NMR-CTの臨床応用 : 計算画像と造影剤の応用について : II.NMR-CT : 特に画像と設置に対する問題点

抄録

Three years have already passed since the clinical used of NMR-CT began in Japan. The techniques for the NMR-CT scanner were developed and improved over these last three years. The images which are produced with the resistive type NMR-CT scanner progressed very much and they were able to supply useful clinical information. The surface coil is able to produce a high S/N ratio or local Image in which we have great interest. We tried to achieve more efficient calculated T_1 images and relaxation rates or BWF (bound water fraction) images which were calculated using T_1 images. Direct sagittal images were able to be obtained easily with NMR-CT, and these images are very useful to check some organs, for example mediastinum, vertebra and pelvis, etc. The relaxation rate image is also useful for the functional analysis, using a contrast medium also, because the relaxation rate depends on the density of the contrast medium in the tissue. BWF image is useful to get the theoretical parameter of the bound water fruction, which depends on the theory of Fullerton et al. In the case of a uterine disease, using the TI image we were able to perform a differential diagnosis between cervical cancer and myoma.