Extraction of accurate stomach contours from X-ray images of barium-filled stomachs and its application to detect potential abnormalities |
| |
| Affiliation: | 1. State Key Laboratory of Land Degradation and Ecological Restoration of Northwestern China, Yinchuan 750021, Ningxia, China;2. College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China;3. Wilfrid Laurier University, Yellowknife Research Office, Yellowknife, NT X1A 2P8, Canada;4. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi''an 710061, China;5. Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi''an 710061, China |
| |
| Abstract: | The extraction of an accurate stomach contour from radiograms for mass screening and the detection of potential abnormalities using the derived contour are described. The difficulty of the extraction is that the shape and the brightness of the stomach region in radiograms change considerably depending on individuals or input conditions. The proposed method first obtains an approximate region and then tracks an accurate stomach contour by a multiresolution edge detector. The edge detector searches for an obvious local maximum in the differentiated data in a small search area near the approximate region in order to determine a contour point. If the local maximum is not ascertained, the search area is expanded. In the event that the larger area fails to reveal a local maximum, a contour point is determined by using a reference direction derived from the approximate region. The detection of abnormalities from the stomach contour obtained by this method has been satisfactory. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
