{
  "ptid_time": "006_S_0681_2008-10-17",
  "img_path": "/data/qiuhui/data/adni/images/006_S_0681/2008-10-17/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 48,985 mm³, 74.5% above the reference mean. With a Z-score of 1.71 (95.6th percentile), this represents moderate enlargement; hippocampal volume measures 7,283 mm³, 2.4% above the reference mean. With a Z-score of 0.22 (58.6th percentile), this represents normal volume ; whole brain volume measures 965,974 mm³, 0.9% below the reference mean. With a Z-score of -0.11 (45.5th percentile), this represents normal volume ; entorhinal cortex volume measures 3,716 mm³, 1.2% above the reference mean. With a Z-score of 0.07 (52.9th percentile), this represents normal volume ; fusiform gyrus volume measures 16,461 mm³, 3.2% below the reference mean. With a Z-score of -0.30 (38.4th percentile), this represents normal volume ; middle temporal gyrus volume measures 19,116 mm³, 0.3% below the reference mean. With a Z-score of -0.02 (49.0th percentile), this represents normal volume . ",
  "text_data": "Age is 78.8 years. Gender is Female. Education: 19 years. MMSE: 28.0. Logical Memory: 24.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The ventricular volume is moderately enlarged (74.5% above reference mean, Z-score 1.71), which can indicate atrophy, but hippocampal, whole brain, entorhinal cortex, fusiform gyrus, and middle temporal gyrus volumes are all within normal ranges. The MMSE score of 28 is within the normal range (≥26), and the presence of one APOE4 allele increases Alzheimer's risk but does not confirm pathology.  \n\n**Diagnosis:** **CN (Cognitively Normal)**  \n**Confidence:** **Medium** (Ventricular enlargement raises some concern, but other structures and cognitive performance are normal.)",
  "timestamp": "2025-07-25T21:31:35.911175"
}