{
  "ptid_time": "002_S_4251_2012-04-17",
  "img_path": "/data/qiuhui/data/adni/images/002_S_4251/2012-04-17/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 23,043 mm³, 40.2% below the reference mean. With a Z-score of -0.96 (16.8th percentile), this represents normal volume ; hippocampal volume measures 7,724 mm³, 2.2% above the reference mean. With a Z-score of 0.21 (58.4th percentile), this represents normal volume ; whole brain volume measures 1,065,600 mm³, 1.3% below the reference mean. With a Z-score of -0.17 (43.4th percentile), this represents normal volume ; entorhinal cortex volume measures 3,037 mm³, 25.9% below the reference mean. With a Z-score of -1.76 (3.9th percentile), this represents moderate atrophy; fusiform gyrus volume measures 18,178 mm³, 3.5% below the reference mean. With a Z-score of -0.30 (38.3th percentile), this represents normal volume ; middle temporal gyrus volume measures 20,860 mm³, 2.2% below the reference mean. With a Z-score of -0.20 (42.0th percentile), this represents normal volume . ",
  "text_data": "Age is 72.4 years. Gender is Male. Education: 19 years. MMSE: 30.0. MoCA: 25.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: MCI.",
  "gpt_diagnosis": "**Reasoning:** The entorhinal cortex shows moderate atrophy (Z-score -1.76, 3.9th percentile), which is a key early marker for Alzheimer's pathology. However, hippocampal and whole brain volumes are normal, and cognitive scores (MMSE 30, MoCA 25) are within normal limits for age, with no significant impairment. APOE4-negative status further reduces Alzheimer's risk.  \n\n**Diagnosis:** **CN (Cognitively Normal)**  \n**Confidence:** **Medium** (due to isolated entorhinal atrophy but otherwise normal biomarkers and cognition)",
  "timestamp": "2025-07-25T20:25:31.229342"
}