Digestive Tract Segmentation
Intestinal Region: Segmentation The digestive tract includes the oropharynx, esophagus, stomach, small intestine, colon, rectum, and anus. The system comprises a wall surrounding a lumen. These regions are natural orphans and contain some airs flown from the mouth.
The stomach, and, to a certain extent, the esophagus, can be distended with extra liquid contrast agent or with gas from a gas-forming agent administered just before imaging. If the lumen is well distended, the luminal regions of the stomach can be easily segmented by a simple thresholding process followed by the connected component selection process or the region-growing process, the seed point of which is set inside an area of gas density of the stomach. Figure 3.83 shows examples of segmentation results of the luminal regions of the stomach.
Fig. 3.82 An example of extracted kidney tumors; original CT slice (left upper), original CT slice with extracted boundary (right upper), and 3D display of the extracted region (lower) (Figure 8 of Ref. )