{
  "ptid_time": "137_S_4631_2019-01-15",
  "img_path": "/data/qiuhui/data/adni/images/137_S_4631/2019-01-15/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 45,882 mm³, 19.1% above the reference mean. With a Z-score of 0.46 (67.7th percentile), this represents normal volume ; hippocampal volume measures 7,645 mm³, 1.1% above the reference mean. With a Z-score of 0.11 (54.4th percentile), this represents normal volume ; whole brain volume measures 1,118,950 mm³, 3.7% above the reference mean. With a Z-score of 0.48 (68.3th percentile), this represents normal volume ; entorhinal cortex volume measures 3,246 mm³, 20.8% below the reference mean. With a Z-score of -1.41 (7.9th percentile), this represents mild atrophy; fusiform gyrus volume measures 18,943 mm³, 0.6% above the reference mean. With a Z-score of 0.05 (51.9th percentile), this represents normal volume ; middle temporal gyrus volume measures 23,199 mm³, 8.7% above the reference mean. With a Z-score of 0.78 (78.3th percentile), this represents normal volume . ",
  "text_data": "Age is 76.0 years. Gender is Male. Education: 20 years. MMSE: 27.0. MoCA: 25.0. Logical Memory: 8.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: AD.",
  "gpt_diagnosis": "**Reasoning:** The entorhinal cortex shows mild atrophy (20.8% below reference mean, Z-score -1.41), which is an early marker of Alzheimer's pathology. However, hippocampal and whole brain volumes are normal, and cognitive scores (MMSE 27, MoCA 25) are within normal limits for age. APOE4-negative status reduces genetic risk.  \n\n**Diagnosis:** **Mild Cognitive Impairment (MCI)**  \n**Confidence:** **Medium** (Atrophy in the entorhinal cortex suggests early neurodegeneration, but cognitive performance is preserved, making dementia unlikely at this stage.)",
  "timestamp": "2025-07-26T16:39:44.656673"
}