{
  "ptid_time": "003_S_4350_2013-12-23",
  "img_path": "/data/qiuhui/data/adni/images/003_S_4350/2013-12-23/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 14,999 mm³, 61.1% below the reference mean. With a Z-score of -1.46 (7.2th percentile), this represents mild atrophy; hippocampal volume measures 8,848 mm³, 17.1% above the reference mean. With a Z-score of 1.66 (95.2th percentile), this represents moderate enlargement; whole brain volume measures 1,141,360 mm³, 5.7% above the reference mean. With a Z-score of 0.75 (77.2th percentile), this represents normal volume ; entorhinal cortex volume measures 4,800 mm³, 17.1% above the reference mean. With a Z-score of 1.16 (87.6th percentile), this represents mild enlargement; fusiform gyrus volume measures 21,019 mm³, 11.6% above the reference mean. With a Z-score of 0.99 (83.8th percentile), this represents normal volume ; middle temporal gyrus volume measures 24,472 mm³, 14.7% above the reference mean. With a Z-score of 1.32 (90.7th percentile), this represents mild enlargement. ",
  "text_data": "Age is 74.9 years. Gender is Male. Education: 13 years. MMSE: 30.0. MoCA: 27.0. Logical Memory: 18.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 1.07 SUVR (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows mild ventricular atrophy but otherwise normal or enlarged volumes in key regions (hippocampus, entorhinal cortex, middle temporal gyrus), which is atypical for Alzheimer's. Cognitive scores (MMSE 30, MoCA 27) are within normal limits, and amyloid PET (AV45) is negative. APOE4-negative status further reduces Alzheimer's risk.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-25T20:52:15.013712"
}