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The method of Segmentation with Scatter and Photopeak window data in Attenuation Correction (SSPAC) recognizes the outlines of the body around chest and lungs using scatter window data after which an attenuation correction (μ) map can be constructed. We have developed a new extraction method, adding a masking process to SSPAC, because the extraction of outlines was otherwise incomplete. Methods and Results: The masking process extracted right and left lung fields from chest images. The qualitydoi:10.17996/anc.16003 fatcat:e766jb5jkje5tneyzkhvga6oo4