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核磁共振CT(简称 NMR-CT)是1978年由英国EMI公司首先研制成功的。它主要是应用在医学诊断方面,同X-CT相比具有许多优点。因为它对软组织,血液及液体方面的分辨能力,以及对脑组织及各器官的鉴别能力均明显地优于X-CT,所以大有后来居上的趋势。特别是近年来运用超导体来产生强磁场,探测与人体生命现象极为相关的原子核(如磷、钠、钾等)必将揭示一个新的广阔前景。在无损检测方面,则由于导体对高频磁场的屏蔽作用,核磁共振CT不能检测具有金属外壳或金属内部的情况,其应用受到很大的限制,仅能测半导体、绝缘体、特别是有机绝缘器材,不如X-CT应用较广。
Nuclear magnetic resonance CT (referred to as NMR-CT) was first developed in 1978 by the British EMI company. It is mainly used in medical diagnosis, compared with X-CT has many advantages. Because of its ability to distinguish soft tissue, blood and liquid, as well as the identification of brain tissue and various organs were significantly superior to X-CT, so the trend of having a comeback. Especially in recent years, the use of superconductors to generate strong magnetic fields and to detect nuclei (such as phosphorus, sodium and potassium) that are closely related to human life phenomena will surely reveal a new bright future. In non-destructive testing, due to the shielding effect of the conductor on the high-frequency magnetic field, the nuclear magnetic resonance CT can not detect the situation with the metal shell or the metal inside, and its application is greatly restricted. Only the semiconductors, insulators, and especially organic insulating materials , It is better that X-CT is used widely.