SolutionsDetection of the NMR signal in the intermediate magnetic field of 100 gauss or more is achieved by resonance input, furthermore magnetization (T1) causes each difference in after the excitation of the period above-mentioned NMR signal which is sufficient, the MRI system which the main magnetic field goes around low to the magnetic field of 50% or less of the above-mentioned resonance frequency is disclosed. As for advantage of this system, be able to occur each image, furthermore it is possible at the low intensity past much than each system to detect the abnormality in the organization of internal of the patient and for example cancer organization etc.< Selective figure >Figure 1【解決手段】NMR信号の検出は100ガウス以上の中間磁場での共鳴入力によって達成され、さらに磁化(T1)における各差を生ずるに充分な期間上記NMR信号の励起の後、主たる磁場が上記共鳴周波数の50%以下の低磁場に巡回するMRIシステムが開示されている。本システムの利点は、各イメージが従来の各システムよりもはるかに低い強度で発生でき、さらに患者の体内の組織、例えば癌組織等における異常を検出することができる。【選択図】図1
