{
  "ptid_time": "002_S_1018_2007-07-16",
  "img_path": "/data/qiuhui/data/adni/images/002_S_1018/2007-07-16/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 21,855 mm³, 22.1% below the reference mean. With a Z-score of -0.51 (30.6th percentile), this represents normal volume ; hippocampal volume measures 7,111 mm³, 0.0% below the reference mean. With a Z-score of -0.00 (49.8th percentile), this represents normal volume ; whole brain volume measures 1,002,620 mm³, 2.9% above the reference mean. With a Z-score of 0.36 (64.1th percentile), this represents normal volume ; entorhinal cortex volume measures 2,669 mm³, 27.3% below the reference mean. With a Z-score of -1.68 (4.7th percentile), this represents moderate atrophy; fusiform gyrus volume measures 15,485 mm³, 9.0% below the reference mean. With a Z-score of -0.82 (20.7th percentile), this represents normal volume ; middle temporal gyrus volume measures 18,383 mm³, 4.1% below the reference mean. With a Z-score of -0.36 (36.1th percentile), this represents normal volume . ",
  "text_data": "Age is 71.2 years. Gender is Female. Education: 13 years. MMSE: 27.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: AD.",
  "gpt_diagnosis": "**Reasoning:** The entorhinal cortex shows moderate atrophy (Z-score -1.68, 4.7th percentile), which is a key early marker for Alzheimer's pathology. However, hippocampal volume is normal, MMSE is within normal range (27/30), and other brain regions show no significant atrophy. APOE4-negative status also reduces Alzheimer's risk.  \n**Diagnosis:** **MCI** (due to isolated entorhinal cortex atrophy but preserved cognition and hippocampal volume).  \n**Confidence:** **Medium** (entorhinal atrophy is concerning, but lack of cognitive impairment and normal hippocampal volume suggest early/preclinical stage).",
  "timestamp": "2025-07-25T20:09:16.192757"
}