{
  "ptid_time": "131_S_1301_2009-03-10",
  "img_path": "/data/qiuhui/data/adni/images/131_S_1301/2009-03-10/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 31,890 mm³, 13.6% above the reference mean. With a Z-score of 0.31 (62.2th percentile), this represents normal volume ; hippocampal volume measures 8,475 mm³, 19.1% above the reference mean. With a Z-score of 1.75 (96.0th percentile), this represents moderate enlargement; whole brain volume measures 1,073,010 mm³, 10.1% above the reference mean. With a Z-score of 1.27 (89.8th percentile), this represents mild enlargement; entorhinal cortex volume measures 3,965 mm³, 8.0% above the reference mean. With a Z-score of 0.49 (68.7th percentile), this represents normal volume ; fusiform gyrus volume measures 14,421 mm³, 15.2% below the reference mean. With a Z-score of -1.39 (8.3th percentile), this represents mild atrophy; middle temporal gyrus volume measures 19,317 mm³, 0.8% above the reference mean. With a Z-score of 0.07 (52.7th percentile), this represents normal volume . ",
  "text_data": "Age is 74.1 years. Gender is Female. Education: 18 years. MMSE: 30.0. Logical Memory: 21.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows mild atrophy in the fusiform gyrus but otherwise normal or enlarged volumes in other regions, including the hippocampus. The MMSE score of 30/30 is intact, and there are no cognitive complaints reported. The presence of one APOE4 allele increases Alzheimer's risk but does not confirm pathology.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to fusiform gyrus atrophy, but strong cognitive performance and lack of clinical symptoms suggest no impairment)",
  "timestamp": "2025-07-26T15:12:47.133044"
}