{
  "ptid_time": "029_S_0824_2007-03-23",
  "img_path": "/data/qiuhui/data/adni/images/029_S_0824/2007-03-23/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 19,732 mm³, 29.7% below the reference mean. With a Z-score of -0.68 (24.8th percentile), this represents normal volume ; hippocampal volume measures 6,237 mm³, 12.3% below the reference mean. With a Z-score of -1.13 (12.9th percentile), this represents mild atrophy; whole brain volume measures 988,194 mm³, 1.4% above the reference mean. With a Z-score of 0.17 (56.9th percentile), this represents normal volume ; entorhinal cortex volume measures 3,263 mm³, 11.2% below the reference mean. With a Z-score of -0.69 (24.7th percentile), this represents normal volume ; fusiform gyrus volume measures 20,558 mm³, 20.8% above the reference mean. With a Z-score of 1.90 (97.1th percentile), this represents moderate enlargement; middle temporal gyrus volume measures 19,219 mm³, 0.3% above the reference mean. With a Z-score of 0.02 (50.9th percentile), this represents normal volume . ",
  "text_data": "Age is 76.7 years. Gender is Female. Education: 13 years. MMSE: 28.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The hippocampal volume shows mild atrophy (Z-score -1.13, 12.9th percentile), which is a key biomarker for Alzheimer’s pathology, but other brain volumes (ventricular, whole brain, entorhinal cortex, middle temporal gyrus) are within normal ranges. The MMSE score of 28 is normal, and the absence of APOE4 reduces genetic risk.  \n\n**Diagnosis:** **Mild Cognitive Impairment (MCI)**  \n**Confidence:** **Medium** (Hippocampal atrophy suggests early neurodegeneration, but cognitive performance remains intact, making dementia unlikely at this stage.)",
  "timestamp": "2025-07-26T04:15:21.808389"
}