{
  "ptid_time": "127_S_4624_2012-12-12",
  "img_path": "/data/qiuhui/data/adni/images/127_S_4624/2012-12-12/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 33,456 mm³, 19.2% above the reference mean. With a Z-score of 0.44 (67.0th percentile), this represents normal volume ; hippocampal volume measures 6,491 mm³, 8.8% below the reference mean. With a Z-score of -0.80 (21.1th percentile), this represents normal volume ; whole brain volume measures 984,889 mm³, 1.1% above the reference mean. With a Z-score of 0.13 (55.3th percentile), this represents normal volume ; entorhinal cortex volume measures 4,377 mm³, 19.2% above the reference mean. With a Z-score of 1.18 (88.0th percentile), this represents mild enlargement; fusiform gyrus volume measures 18,092 mm³, 6.3% above the reference mean. With a Z-score of 0.58 (71.8th percentile), this represents normal volume ; middle temporal gyrus volume measures 18,626 mm³, 2.8% below the reference mean. With a Z-score of -0.25 (40.3th percentile), this represents normal volume . ",
  "text_data": "Age is 78.1 years. Gender is Female. Education: 13 years. MMSE: 28.0. MoCA: 25.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The hippocampal volume is slightly below the reference mean (Z-score -0.80, 21.1th percentile), but still within the normal range. Cognitive scores (MMSE 28, MoCA 25) are within normal limits for age, and no other significant atrophy is noted. 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 borderline hippocampal volume and APOE4 status, but normal cognition and other brain volumes)",
  "timestamp": "2025-07-26T13:20:03.263437"
}