光源可以包括将它们的输出组合成多色束的激光 发射器。
The light sources may include laser emitters that combine their outputs into a polychromatic beam.
若直接用多色投影数据来重建图像，就会出现射束硬化伪迹，这种硬化伪迹如果不校正就会影响医学诊断和工业检测的结果。
Once this kind of data is used to reconstruct the image directly, beam-hardening artifacts appear in the reconstructed image.
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