{
  "ptid_time": "099_S_0551_2006-11-28",
  "img_path": "/data/qiuhui/data/adni/images/099_S_0551/2006-11-28/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 19,899 mm³, 33.7% below the reference mean. With a Z-score of -0.80 (21.1th percentile), this represents normal volume ; hippocampal volume measures 7,113 mm³, 11.4% below the reference mean. With a Z-score of -1.14 (12.8th percentile), this represents mild atrophy; whole brain volume measures 1,086,520 mm³, 4.2% below the reference mean. With a Z-score of -0.60 (27.5th percentile), this represents normal volume ; entorhinal cortex volume measures 3,377 mm³, 20.8% below the reference mean. With a Z-score of -1.44 (7.5th percentile), this represents mild atrophy; fusiform gyrus volume measures 15,192 mm³, 23.7% below the reference mean. With a Z-score of -1.97 (2.4th percentile), this represents moderate atrophy; middle temporal gyrus volume measures 18,379 mm³, 18.0% below the reference mean. With a Z-score of -1.48 (6.9th percentile), this represents mild atrophy. ",
  "text_data": "Age is 64.7 years. Gender is Male. Education: 16 years. MMSE: 28.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The imaging data shows mild to moderate atrophy in key Alzheimer's-related regions (hippocampus, entorhinal cortex, fusiform gyrus, middle temporal gyrus), but the MMSE score of 28 is within the normal range (≥26), and there is no APOE4 risk allele. The cognitive performance is preserved despite structural changes.  \n**Diagnosis:** **Mild Cognitive Impairment (MCI)** (due to structural atrophy without significant cognitive decline)  \n**Confidence:** **Medium** (cognitive scores are normal, but atrophy patterns suggest early neurodegenerative changes)",
  "timestamp": "2025-07-26T10:58:25.724360"
}