{
  "ptid_time": "098_S_0171_2010-02-20",
  "img_path": "/data/qiuhui/data/adni/images/098_S_0171/2010-02-20/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 71,719 mm³, 94.0% above the reference mean. With a Z-score of 2.54 (99.4th percentile), this represents significant enlargement; hippocampal volume measures 6,181 mm³, 4.8% below the reference mean. With a Z-score of -0.39 (34.9th percentile), this represents normal volume ; whole brain volume measures 891,432 mm³, 4.0% below the reference mean. With a Z-score of -0.48 (31.7th percentile), this represents normal volume ; entorhinal cortex volume measures 3,243 mm³, 6.3% below the reference mean. With a Z-score of -0.34 (36.6th percentile), this represents normal volume ; fusiform gyrus volume measures 14,899 mm³, 7.5% below the reference mean. With a Z-score of -0.56 (28.6th percentile), this represents normal volume ; middle temporal gyrus volume measures 16,355 mm³, 9.3% below the reference mean. With a Z-score of -0.83 (20.4th percentile), this represents normal volume . ",
  "text_data": "Age is 82.3 years. Gender is Female. Education: 17 years. MMSE: 29.0. Logical Memory: 9.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The ventricular volume is significantly enlarged (Z-score 2.54, 99.4th percentile), which is a strong indicator of brain atrophy, particularly in neurodegenerative conditions like Alzheimer's. However, hippocampal and other regional volumes are within normal limits (Z-scores close to 0), and cognitive performance (MMSE 29) is intact. The absence of APOE4 reduces genetic risk.  \n\n**Diagnosis:** **Cognitively Normal (CN)**  \n**Confidence:** **Medium** (ventricular enlargement suggests possible early neurodegeneration, but preserved cognition and normal regional volumes argue against MCI/dementia at this stage).",
  "timestamp": "2025-07-26T10:38:07.948980"
}