{
  "ptid_time": "136_S_0186_2009-04-28",
  "img_path": "/data/qiuhui/data/adni/images/136_S_0186/2009-04-28/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 55,104 mm³, 49.1% above the reference mean. With a Z-score of 1.32 (90.7th percentile), this represents mild enlargement; hippocampal volume measures 7,671 mm³, 18.1% above the reference mean. With a Z-score of 1.45 (92.7th percentile), this represents mild enlargement; whole brain volume measures 1,013,480 mm³, 9.2% above the reference mean. With a Z-score of 1.10 (86.5th percentile), this represents mild enlargement; entorhinal cortex volume measures 3,856 mm³, 11.4% above the reference mean. With a Z-score of 0.61 (73.0th percentile), this represents normal volume ; fusiform gyrus volume measures 18,338 mm³, 13.8% above the reference mean. With a Z-score of 1.04 (85.1th percentile), this represents mild enlargement; middle temporal gyrus volume measures 20,035 mm³, 11.1% above the reference mean. With a Z-score of 0.99 (83.9th percentile), this represents normal volume . ",
  "text_data": "Age is 83.4 years. Gender is Female. Education: 16 years. MMSE: 28.0. Logical Memory: 17.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows mild enlargement in several regions (ventricular, hippocampal, whole brain, fusiform gyrus) but no significant atrophy, which is atypical for Alzheimer's. The MMSE score of 28 is within the normal range, and the absence of APOE4 further reduces Alzheimer's risk.  \n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to the unusual pattern of mild enlargement rather than atrophy, but cognitive scores support normal function)",
  "timestamp": "2025-07-26T15:57:58.727537"
}