The study was reviewed and approved by Ethics Committee of the Affiliated Hospital of Southwest Medical University (18 January 2017, KY2021023). CT data were retrieved from the 2019 Kidney and Kidney Tumor Segmentation Challenge (KiTS19) (https://wiki.cancerimagingarchive.net/pages/viewpage.action?pageId=61081171) of The Cancer Imaging Archive (TCIA) open access database. Arterial phase-enhanced images of 210 patients from the database were used to establish an automatic classification model. The kidneys and tumors were already manually segmented. These CT images were randomly divided into a training set (168 cases) and test set (42 cases).
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