{
  "ptid_time": "006_S_0731_2007-03-12",
  "img_path": "/data/qiuhui/data/adni/images/006_S_0731/2007-03-12/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 18,154 mm³, 52.9% below the reference mean. With a Z-score of -1.27 (10.3th percentile), this represents mild atrophy; hippocampal volume measures 8,007 mm³, 5.9% above the reference mean. With a Z-score of 0.58 (71.8th percentile), this represents normal volume ; whole brain volume measures 1,089,860 mm³, 1.0% above the reference mean. With a Z-score of 0.13 (55.0th percentile), this represents normal volume ; entorhinal cortex volume measures 4,711 mm³, 14.9% above the reference mean. With a Z-score of 1.01 (84.4th percentile), this represents mild enlargement; fusiform gyrus volume measures 19,687 mm³, 4.5% above the reference mean. With a Z-score of 0.38 (64.9th percentile), this represents normal volume ; middle temporal gyrus volume measures 22,762 mm³, 6.7% above the reference mean. With a Z-score of 0.60 (72.6th percentile), this represents normal volume . ",
  "text_data": "Age is 72.0 years. Gender is Male. Education: 18 years. MMSE: 29.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild ventricular atrophy but otherwise normal or even slightly enlarged volumes in key regions (hippocampus, entorhinal cortex, fusiform gyrus, middle temporal gyrus). The MMSE score of 29 is within the normal range, and the absence of APOE4 alleles reduces genetic risk. No significant atrophy is seen in Alzheimer’s-vulnerable regions.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-25T21:31:54.980245"
}