{
  "ptid_time": "037_S_5126_2015-05-13",
  "img_path": "/data/qiuhui/data/adni/images/037_S_5126/2015-05-13/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 58,068 mm³, 106.9% above the reference mean. With a Z-score of 2.45 (99.3th percentile), this represents significant enlargement; hippocampal volume measures 6,816 mm³, 4.2% below the reference mean. With a Z-score of -0.38 (35.0th percentile), this represents normal volume ; whole brain volume measures 1,046,240 mm³, 7.3% above the reference mean. With a Z-score of 0.92 (82.2th percentile), this represents normal volume . ",
  "text_data": "Age is 70.5 years. Gender is Female. Education: 12 years. MMSE: 30.0. MoCA: 30.0. Logical Memory: 15.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 1.02 SUVR (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The data shows significant ventricular enlargement (106.9% above mean, Z-score 2.45), which is a marker of brain atrophy, but hippocampal and whole brain volumes are within normal ranges. Cognitive scores (MMSE 30, MoCA 30) are intact, and amyloid PET (AV45) is normal. APOE4-negative status further reduces Alzheimer's risk.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (ventricular enlargement suggests some neurodegeneration, but no cognitive or biomarker evidence of impairment)",
  "timestamp": "2025-07-26T06:49:54.318721"
}