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. Author manuscript; available in PMC: 2014 Sep 1.
Published in final edited form as: J Thorac Imaging. 2013 Sep;28(5):10.1097/RTI.0b013e31829efbe9. doi: 10.1097/RTI.0b013e31829efbe9

Figure 2.

Figure 2

This figure shows CT scans from two subjects scanned using a low dose CT scan (40 mAs) (panels A and C) and a clinical CT dose (120 mAs) (panels B and D). The increased noise in the low dose CT scans (A and C) can be seen as linear “streaks” or a more “mottled” image while the clinical dose CT scans show (B and D) show a “smoother” image. Panel E shows the frequency distribution of x-ray attenuation values from one subject and it can be seen that there is a difference in the extent of emphysema measured using either the threshold or percentile analysis (solid gray line ( ) clinical dose CT scan, solid black line ( ) low dose CT scan).