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. Author manuscript; available in PMC: 2009 Nov 27.
Published in final edited form as: Acad Radiol. 2005 Jun;12(6):782–792. doi: 10.1016/j.acra.2005.01.014

Figure 1.

Figure 1

(a) Typical CT slice image after DC component shifting. (b) Histogram of thoracic region excluding zero gray level. P1, lung air region; P2, P3, chest wall and soft tissue, and P4, vessel and heart.