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关于焦虑，说法正确的是：
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Based on the ( ) structure of X Ray machine, lots of medical departments have developed their own specialized X Ray machine.
When directed at a target of low density， X-ray can pass through the substance and uninterrupted. Higher density targets will reflect or absorb the X Ray. Thus, an X Ray image shows dark areas for ( )tissue and shows light areas for ( )。
With the development of technology, there are new problems for digital medical imaging equipment, for example, how to realize effective ( ) and make use of increasingly large digital information, how to mine more useful information from these kinds of information and so on.
X-ray generating device include:
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