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由于T_1、T_2这两种信息是描述组织内原子核中核自旋(例如氢原子中质子)与当时周围环境(晶格)间能量传递的时间过程(T_1值)和核自旋-核自旋间相互作用的时间过程(T_2值),T_1、T_2值常反映组织的生理生化状况,不同的组织的T_1、T_2值是不同的,因此在MRI影象中T_1和T_2值的测量对鉴别组织的正常与病理情况有重大的临床意义。采用不同的脉冲程序系列(SR、IR、SE)和选择不同的脉冲时间间隔(T_I、T_E、T_R),能
Since T_1 and T_2 are both information describing the time course (T_1 value) of energy transfer between nuclear spins (such as protons in hydrogen atoms) and the surrounding environment (lattices) in the nucleus of the tissue and the relationship between nuclear spin-nuclear spin The time course of interaction (T_2), T_1 and T_2 values often reflect the physiological and biochemical conditions of the tissues. The values of T_1 and T_2 are different in different tissues. Therefore, Normal and pathological conditions have great clinical significance. Using different series of pulse programs (SR, IR, SE) and selecting different pulse intervals (T_I, T_E, T_R)