{
  "ptid_time": "094_S_6468_2018-07-19",
  "img_path": "/data/qiuhui/data/adni/images/094_S_6468/2018-07-19/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 46,780 mm³, 55.8% above the reference mean. With a Z-score of 1.33 (90.8th percentile), this represents mild enlargement; hippocampal volume measures 7,919 mm³, 1.4% below the reference mean. With a Z-score of -0.14 (44.6th percentile), this represents normal volume ; whole brain volume measures 1,136,540 mm³, 0.2% above the reference mean. With a Z-score of 0.03 (51.0th percentile), this represents normal volume ; entorhinal cortex volume measures 4,415 mm³, 3.6% above the reference mean. With a Z-score of 0.25 (59.8th percentile), this represents normal volume ; fusiform gyrus volume measures 22,846 mm³, 14.8% above the reference mean. With a Z-score of 1.23 (89.0th percentile), this represents mild enlargement; middle temporal gyrus volume measures 26,094 mm³, 16.4% above the reference mean. With a Z-score of 1.35 (91.2th percentile), this represents mild enlargement. ",
  "text_data": "Age is 69.4 years. Gender is Male. Education: 16 years. Handedness: Right. Race: White. MMSE: 29.0. MoCA: 29.0. Logical Memory: 15.0. APOEε4 alleles: 1.0. Biomarker levels: Flobetaben (FBB): 1.24 SUVR (significant elevated). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The ventricular volume is mildly enlarged (55.8% above mean, Z-score 1.33), which can be associated with aging or early neurodegenerative changes, but hippocampal volume is normal (Z-score -0.14). Cognitive scores (MMSE 29, MoCA 29) are intact, and other brain regions (whole brain, entorhinal cortex, fusiform gyrus, middle temporal gyrus) show normal or mildly enlarged volumes without atrophy. APOE4 carrier status increases Alzheimer’s risk but does not confirm pathology.  \n\n**Diagnosis:** **CN (Cognitively Normal)**  \n**Confidence:** **Medium** (ventricular enlargement raises some concern, but preserved cognition and hippocampal volume suggest no significant impairment).",
  "timestamp": "2025-07-26T10:35:41.047092"
}