Coronary calcium is detected by ct scanning, a noninvasive procedure that, for calcium detection, does not require injected contrast.

冠状动脉钙量是通过CT扫描检测的，这种无创方法检测钙时不需要注射造影剂。

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However, they had all been injected with a contrast agent to improve the visibility of their internal organs in the 3D images MRI scanners produce.

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By contrast, the Novo Nordisk drug Victoza must be injected daily.

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Other brain cancer cells, by contrast, were incapable of forming new tumors, no matter how many were injected into the mice, Dirks wrote last month in the journal Nature.

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