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Ct的本质就是x光，有辐射的。 petct也是有辐射，叠加辐射。 mr就是核磁，是指带有正电荷的 磁性原子核 自旋产生的磁场。 磁共振的原理就是一个人为制造的磁场，人体. Dr，mr，miss，mrs，ms.分别是什么意思dr, mr, miss, mrs, ms.
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