{
  "ptid_time": "041_S_1002_2007-06-07",
  "img_path": "/data/qiuhui/data/adni/images/041_S_1002/2007-06-07/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 56,724 mm³, 102.1% above the reference mean. With a Z-score of 2.34 (99.0th percentile), this represents significant enlargement; whole brain volume measures 1,043,660 mm³, 7.1% above the reference mean. With a Z-score of 0.89 (81.4th percentile), this represents normal volume . ",
  "text_data": "Age is 76.8 years. Gender is Female. Education: 18 years. MMSE: 30.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The ventricular volume is significantly enlarged (Z-score 2.34, 99th percentile), which is often associated with brain atrophy and neurodegenerative processes. However, the whole brain volume is normal (Z-score 0.89), and cognitive performance (MMSE 30) is intact with no APOE4 risk alleles.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (ventricular enlargement raises concern, but preserved cognition and brain volume suggest no current impairment)",
  "timestamp": "2025-07-26T07:02:31.751905"
}