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Figure 23a. Use of an opacity threshold for segmentation, as shown on a full field of view 3D volume-rendered image of the chest and abdomen. (a) A low opacity threshold allows the skin to obscure the abdominal contents. A vertical row of shirt buttons is seen in the midline. (b–d) Progressively increasing the opacity threshold excludes first low-opacity soft tissues (skin, fat) (b) then high-opacity soft tissues (muscle, bowel wall) (c) while contrast-enhanced organs and vessels remain (d). (e) Eventually only the most opaque objects (bone, calcium, excreted contrast material) remain.
