{
  "ptid_time": "141_S_0810_2007-05-25",
  "img_path": "/data/qiuhui/data/adni/images/141_S_0810/2007-05-25/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 52,377 mm³, 11.4% above the reference mean. With a Z-score of 0.33 (63.0th percentile), this represents normal volume ; hippocampal volume measures 6,974 mm³, 0.1% above the reference mean. With a Z-score of 0.01 (50.3th percentile), this represents normal volume ; whole brain volume measures 995,819 mm³, 3.2% below the reference mean. With a Z-score of -0.42 (33.6th percentile), this represents normal volume ; entorhinal cortex volume measures 4,374 mm³, 10.2% above the reference mean. With a Z-score of 0.67 (74.8th percentile), this represents normal volume ; fusiform gyrus volume measures 15,358 mm³, 15.0% below the reference mean. With a Z-score of -1.30 (9.7th percentile), this represents mild atrophy; middle temporal gyrus volume measures 19,405 mm³, 3.8% below the reference mean. With a Z-score of -0.34 (36.7th percentile), this represents normal volume . ",
  "text_data": "Age is 83.8 years. Gender is Male. Education: 16 years. MMSE: 27.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows mostly normal measurements, with only mild atrophy in the fusiform gyrus (Z-score -1.30, 9.7th percentile). The hippocampal volume, a key marker for Alzheimer's, is normal (Z-score 0.01). The MMSE score of 27 is within the normal range (≥26), and the absence of APOE4 alleles reduces genetic risk.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mild fusiform gyrus atrophy, but no other significant structural or cognitive deficits)",
  "timestamp": "2025-07-26T16:49:48.523096"
}