{
  "ptid_time": "128_S_0500_2007-06-08",
  "img_path": "/data/qiuhui/data/adni/images/128_S_0500/2007-06-08/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 64,888 mm³, 68.5% above the reference mean. With a Z-score of 1.64 (95.0th percentile), this represents moderate enlargement; hippocampal volume measures 8,620 mm³, 14.0% above the reference mean. With a Z-score of 1.37 (91.5th percentile), this represents mild enlargement; whole brain volume measures 1,194,150 mm³, 10.6% above the reference mean. With a Z-score of 1.38 (91.6th percentile), this represents mild enlargement; entorhinal cortex volume measures 4,286 mm³, 4.5% above the reference mean. With a Z-score of 0.31 (62.0th percentile), this represents normal volume ; fusiform gyrus volume measures 18,933 mm³, 0.5% above the reference mean. With a Z-score of 0.04 (51.7th percentile), this represents normal volume ; middle temporal gyrus volume measures 25,582 mm³, 19.9% above the reference mean. With a Z-score of 1.79 (96.3th percentile), this represents moderate enlargement. ",
  "text_data": "Age is 78.4 years. Gender is Male. Education: 14 years. MMSE: 29.0. Logical Memory: 8.0. APOEε4 alleles: 0.0. Biomarker levels: Pittsburgh compound B: 1.26 SUVR (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows moderate ventricular enlargement (consistent with age-related atrophy) but otherwise normal-to-above-average volumes in key regions (hippocampus, entorhinal cortex, fusiform gyrus). The MMSE score of 29 is within the normal range, and the absence of APOE4 alleles reduces genetic risk. No significant atrophy in Alzheimer’s-vulnerable regions is observed.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T13:45:18.614668"
}