{
  "ptid_time": "094_S_0692_2007-01-18",
  "img_path": "/data/qiuhui/data/adni/images/094_S_0692/2007-01-18/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 41,005 mm³, 46.1% above the reference mean. With a Z-score of 1.06 (85.4th percentile), this represents mild enlargement; hippocampal volume measures 7,342 mm³, 3.2% above the reference mean. With a Z-score of 0.29 (61.5th percentile), this represents normal volume ; whole brain volume measures 916,143 mm³, 6.0% below the reference mean. With a Z-score of -0.76 (22.5th percentile), this represents normal volume ; entorhinal cortex volume measures 4,402 mm³, 19.9% above the reference mean. With a Z-score of 1.22 (88.8th percentile), this represents mild enlargement; fusiform gyrus volume measures 16,564 mm³, 2.6% below the reference mean. With a Z-score of -0.24 (40.5th percentile), this represents normal volume ; middle temporal gyrus volume measures 17,401 mm³, 9.2% below the reference mean. With a Z-score of -0.80 (21.2th percentile), this represents normal volume . ",
  "text_data": "Age is 77.2 years. Gender is Female. Education: 19 years. MMSE: 28.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The ventricular volume shows mild enlargement (Z-score 1.06), which can be associated with atrophy, but hippocampal and whole brain volumes are within normal ranges. The MMSE score of 28 is within the normal range (≥26), and there are no significant volumetric deficits in key Alzheimer’s-related regions (e.g., hippocampus, entorhinal cortex). The presence of one APOE4 allele increases risk but does not confirm pathology.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mild ventricular enlargement but otherwise normal cognitive and structural findings)",
  "timestamp": "2025-07-26T10:12:57.728850"
}