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【单选题】
关于CT窗口技术的概念，错误的是A.
CT图像是由许多像素组成的数字图像
B.
扫描后得到的原始数据在计算机内重建后的图像是由横行、纵列组成的数字阵列，也被称为矩阵
C.
像素加上深度后，被称为体素
D.
扫描野是指X线照射穿透受检者后到达探测器，能被用于图像重建的有效照射范围
E.
根据已知的扫描野和矩阵大小，可以计算出体素的大小
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