{
  "ptid_time": "094_S_0692_2007-08-16",
  "img_path": "/data/qiuhui/data/adni/images/094_S_0692/2007-08-16/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 42,721 mm³, 52.2% above the reference mean. With a Z-score of 1.20 (88.4th percentile), this represents mild enlargement; hippocampal volume measures 7,056 mm³, 0.8% below the reference mean. With a Z-score of -0.08 (47.0th percentile), this represents normal volume ; whole brain volume measures 917,725 mm³, 5.8% below the reference mean. With a Z-score of -0.74 (23.1th percentile), this represents normal volume ; entorhinal cortex volume measures 4,057 mm³, 10.5% above the reference mean. With a Z-score of 0.64 (74.0th percentile), this represents normal volume ; fusiform gyrus volume measures 17,425 mm³, 2.4% above the reference mean. With a Z-score of 0.22 (58.7th percentile), this represents normal volume ; middle temporal gyrus volume measures 19,002 mm³, 0.9% below the reference mean. With a Z-score of -0.08 (47.0th percentile), this represents normal volume . ",
  "text_data": "Age is 77.7 years. Gender is Female. Education: 19 years. MMSE: 29.0. Logical Memory: 13.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The ventricular volume shows mild enlargement (Z-score 1.20), but all other brain structures, including the hippocampus, are within normal ranges (Z-scores close to 0). The MMSE score of 29 is within the normal range (≥26), and there is no significant atrophy in key Alzheimer’s-related regions. 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 no other structural or cognitive deficits)",
  "timestamp": "2025-07-26T10:13:06.435014"
}