{
  "ptid_time": "057_S_0818_2007-03-28",
  "img_path": "/data/qiuhui/data/adni/images/057_S_0818/2007-03-28/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 12,508 mm³, 55.4% below the reference mean. With a Z-score of -1.27 (10.2th percentile), this represents mild atrophy; hippocampal volume measures 7,766 mm³, 9.2% above the reference mean. With a Z-score of 0.84 (80.0th percentile), this represents normal volume ; whole brain volume measures 963,154 mm³, 1.2% below the reference mean. With a Z-score of -0.15 (44.1th percentile), this represents normal volume ; entorhinal cortex volume measures 4,057 mm³, 10.5% above the reference mean. With a Z-score of 0.64 (74.0th percentile), this represents normal volume ; fusiform gyrus volume measures 16,229 mm³, 4.6% below the reference mean. With a Z-score of -0.42 (33.7th percentile), this represents normal volume ; middle temporal gyrus volume measures 21,087 mm³, 10.0% above the reference mean. With a Z-score of 0.87 (80.7th percentile), this represents normal volume . ",
  "text_data": "Age is 74.5 years. Gender is Female. Education: 10 years. MMSE: 28.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild ventricular enlargement (mild atrophy) but otherwise normal volumes in key regions like the hippocampus, entorhinal cortex, and temporal lobes. The MMSE score of 28 is within the normal range, and the absence of APOE4 alleles reduces genetic risk. No significant cognitive deficits or structural abnormalities suggestive of neurodegeneration are present.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T08:05:03.206635"
}