{
  "ptid_time": "126_S_5243_2019-09-12",
  "img_path": "/data/qiuhui/data/adni/images/126_S_5243/2019-09-12/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 30,696 mm³, 20.3% below the reference mean. With a Z-score of -0.49 (31.3th percentile), this represents normal volume ; hippocampal volume measures 8,513 mm³, 12.6% above the reference mean. With a Z-score of 1.23 (89.1th percentile), this represents mild enlargement; whole brain volume measures 1,023,140 mm³, 5.2% below the reference mean. With a Z-score of -0.68 (24.9th percentile), this represents normal volume ; entorhinal cortex volume measures 4,831 mm³, 17.8% above the reference mean. With a Z-score of 1.21 (88.6th percentile), this represents mild enlargement; fusiform gyrus volume measures 18,549 mm³, 1.5% below the reference mean. With a Z-score of -0.13 (44.8th percentile), this represents normal volume ; middle temporal gyrus volume measures 21,084 mm³, 1.2% below the reference mean. With a Z-score of -0.11 (45.7th percentile), this represents normal volume . ",
  "text_data": "Age is 77.0 years. Gender is Male. Education: 12 years. MMSE: 27.0. MoCA: 28.0. Logical Memory: 14.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume measurements are largely within normal ranges, with some regions (hippocampus, entorhinal cortex) showing mild enlargement, which is atypical for Alzheimer's but not necessarily pathological. Cognitive scores (MMSE 27, MoCA 28) are within normal limits for age, and the presence of one APOE4 allele increases risk but does not confirm impairment.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to atypical hippocampal/entorhinal enlargement but normal cognition and no clear atrophy)",
  "timestamp": "2025-07-26T12:53:35.743150"
}