{
  "ptid_time": "041_S_5100_2019-07-11",
  "img_path": "/data/qiuhui/data/adni/images/041_S_5100/2019-07-11/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 73,633 mm³, 91.2% above the reference mean. With a Z-score of 2.18 (98.6th percentile), this represents significant enlargement; hippocampal volume measures 8,090 mm³, 7.0% above the reference mean. With a Z-score of 0.69 (75.3th percentile), this represents normal volume ; whole brain volume measures 1,175,100 mm³, 8.9% above the reference mean. With a Z-score of 1.15 (87.5th percentile), this represents mild enlargement; entorhinal cortex volume measures 4,292 mm³, 4.7% above the reference mean. With a Z-score of 0.32 (62.4th percentile), this represents normal volume ; fusiform gyrus volume measures 19,825 mm³, 5.2% above the reference mean. With a Z-score of 0.45 (67.2th percentile), this represents normal volume ; middle temporal gyrus volume measures 19,519 mm³, 8.5% below the reference mean. With a Z-score of -0.77 (22.2th percentile), this represents normal volume . ",
  "text_data": "Age is 77.7 years. Gender is Male. Education: 16 years. MMSE: 29.0. MoCA: 28.0. Logical Memory: 12.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 1.02 SUVR (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The ventricular volume is significantly enlarged (Z-score 2.18), which is often associated with neurodegeneration, but hippocampal and other key cortical volumes (entorhinal, fusiform, middle temporal gyrus) are within normal ranges. Cognitive scores (MMSE 29, MoCA 28) are intact, and amyloid PET (AV45) is normal, making Alzheimer’s pathology unlikely.  \n\n**Diagnosis:** **CN (Cognitively Normal)**  \n**Confidence:** **Medium** (Ventricular enlargement raises suspicion, but preserved cognition and normal amyloid suggest no active dementia or MCI.)",
  "timestamp": "2025-07-26T07:26:38.296244"
}