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. Author manuscript; available in PMC: 2018 Apr 1.
Published in final edited form as: IEEE Trans Med Imaging. 2016 Sep 16;36(4):865–877. doi: 10.1109/TMI.2016.2609888

Fig. 3.

Fig. 3

Comparison of images with and without contrast agent. The contrast agent strongly attenuates the X-rays, which is visible as an additional peak at intensity 75 in the histogram Fig. 3d. In consequence, AEC increases the X-ray tube power, which shifts the rest of the histogram to the right.