{
  "ptid_time": "023_S_1126_2009-02-06",
  "img_path": "/data/qiuhui/data/adni/images/023_S_1126/2009-02-06/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 64,150 mm³, 36.4% above the reference mean. With a Z-score of 1.06 (85.5th percentile), this represents mild enlargement; whole brain volume measures 957,416 mm³, 7.0% below the reference mean. With a Z-score of -0.91 (18.1th percentile), this represents normal volume . ",
  "text_data": "Age is 82.4 years. Gender is Male. Education: 18 years. MMSE: 28.0. Logical Memory: 2.0. APOEε4 alleles: 0.0. Biomarker levels: Amyloid beta: 567.60 pg/mL (mild reduced); Total tau: 213.80 pg/mL (normal ); Phosphorylated tau: 20.60 pg/mL (normal ). ",
  "true_diagnosis": "Diagnosis: AD.",
  "gpt_diagnosis": "**Reasoning:** The ventricular enlargement (36.4% above mean) and mild whole brain volume reduction (7.0% below mean) suggest some structural changes, but the MMSE score of 28 is within the normal range (≥26). Biomarkers show mildly reduced Aβ but normal tau levels, and the absence of APOE4 reduces genetic risk.  \n\n**Diagnosis:** **CN (Cognitively Normal)**  \n**Confidence:** **Medium** (due to conflicting structural changes but preserved cognition and mostly normal biomarkers)",
  "timestamp": "2025-07-26T02:54:59.847635"
}