【单选题】【消耗次数：1】
下列关于窗宽的概念，错误的是
①
窗宽规定了所显示灰阶的中心
②
窗宽规定了所显示CT值的范围
③
通常CT机的窗宽都是可调节的
④
窗宽越大，不同组织间的灰度对比越低
⑤
实际应用时，选择窗宽不包括所有组织的显示范围
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