不管年龄是多少，任何成像过程的一个引导原则就是辐射应该受限制——或“锥形”——对于被检查的部位来说。

A guiding principle for any imaging procedure, regardless of age, is that radiation should be limited - or "coned" - to the area being examined.

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在 24 种 NFS 可调参数中，已经有 21 种被分类为受限制的（请参见 清单 16）。

Of the 24 NFS tunables, 21 have been classified as restricted (see Listing 16).

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图3中图形符号表示Application元素包含不受限制的元素序列，以及每个被包含元素是Parameter、Object和Property等等的类型。

The graphic symbols in Figure 3 indicate that an Application element contains an unbounded sequence of elements, the type of each contained element being Parameter, Object, Property, etc.

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