Aim: To learn the analysis of CT for elderly spinal degenerative diseases.
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目的：老年退行性心脏瓣膜病（SDHVD）是心脏瓣膜纤维层的退行性病变及钙盐沉积的结果。
Objective:Senile Degenerated Heart Valvular Diseases(SDHVD) is a result of degenerated prossese in fibra layer of cardiac valve as well as calcium deposition.
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