Two-component Radiology-guided Autonomous Cascade Engine (TRACE)

Inclusion Criteria (Imaging Data) 1. Contrast-enhanced CT (CE-CT) images of gastric cancer patients from the Liaoning Cancer Hospital; 2. Patients with a definitive postoperative pathological diagnosis of gastric cancer and a clear T-stage classification (T1-T4, including T4a and T4b); 3. Imaging data must be complete and of sufficient quality to meet diagnostic and analytical requirements, with no significant artefacts or missing key data; 4. Complete clinical and pathological information must be available to establish a diagnostic gold standard for comparison. Physician Inclusion Criteria (Image Readers) 1. Radiologists holding a valid medical licence; 2. From the radiology department of a Grade A tertiary hospital or a non-Grade A tertiary hospital; 3. Classified as senior or junior physicians based on clinical experience; 4. Voluntarily participating in this study and completing both the non-AI-assisted and AI-assisted image interpretation tasks. Case Exclusion Criteria 1. Severe missing imaging data or quality failing to meet analysis requirements (e.g., severe motion artefacts); 2. Lack of clear postoperative pathological T-staging results; 3. Cases not involving gastric cancer or with incomplete pathological information; 4. Cases of duplicate enrolment or inconsistent data recording. Physician Exclusion Criteria 1. Those unable to complete all image review tasks or demonstrating severe non-compliance; 2. Those who withdraw during the study period and are unable to provide complete data for both phases of image review; 3. Those who fail to complete the AI-assisted and non-AI-assisted interpretation processes as specified. Withdrawal Criteria 1. Physicians who voluntarily withdraw from the study for personal reasons (e.g., time, health or work commitments); 2. Physicians who fail to complete the required image review tasks or have data missing in excess of the specified threshold; 3. Cases where critical data errors are identified during subsequent verification or where pathological results cannot be traced; Data found during the study to be non-compliant with ethical or quality control requirements must be excluded.