{
  "ptid_time": "014_S_0563_2008-02-23",
  "img_path": "/data/qiuhui/data/adni/images/014_S_0563/2008-02-23/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 59,178 mm³, 25.9% above the reference mean. With a Z-score of 0.75 (77.4th percentile), this represents normal volume ; hippocampal volume measures 5,046 mm³, 27.6% below the reference mean. With a Z-score of -2.38 (0.9th percentile), this represents significant atrophy; whole brain volume measures 972,181 mm³, 5.5% below the reference mean. With a Z-score of -0.73 (23.4th percentile), this represents normal volume ; entorhinal cortex volume measures 3,615 mm³, 8.9% below the reference mean. With a Z-score of -0.58 (28.0th percentile), this represents normal volume ; fusiform gyrus volume measures 15,336 mm³, 15.1% below the reference mean. With a Z-score of -1.31 (9.5th percentile), this represents mild atrophy; middle temporal gyrus volume measures 17,913 mm³, 11.2% below the reference mean. With a Z-score of -1.00 (15.8th percentile), this represents mild atrophy. ",
  "text_data": "Age is 82.1 years. Gender is Male. Education: 18 years. MMSE: 27.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: MCI.",
  "gpt_diagnosis": "**Reasoning:** The hippocampal volume shows significant atrophy (Z-score -2.38, 0.9th percentile), which is strongly associated with Alzheimer's disease. Other regions (fusiform gyrus, middle temporal gyrus) show mild atrophy, while whole brain and entorhinal cortex volumes are within normal limits. The MMSE score of 27 is borderline but still within normal range for age, though hippocampal atrophy suggests early neurodegeneration.  \n\n**Diagnosis:** **Mild Cognitive Impairment (MCI)** (likely amnestic subtype given hippocampal atrophy)  \n\n**Confidence:** **Medium** (high confidence in hippocampal atrophy, but MMSE is near-normal and APOE4-negative status reduces certainty of progression to dementia).",
  "timestamp": "2025-07-25T23:45:27.786837"
}