{
  "ptid_time": "036_S_4389_2013-01-22",
  "img_path": "/data/qiuhui/data/adni/images/036_S_4389/2013-01-22/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 31,075 mm³, 33.9% below the reference mean. With a Z-score of -0.98 (16.2th percentile), this represents normal volume ; hippocampal volume measures 8,598 mm³, 23.4% above the reference mean. With a Z-score of 2.02 (97.8th percentile), this represents significant enlargement; whole brain volume measures 1,192,310 mm³, 15.9% above the reference mean. With a Z-score of 2.08 (98.1th percentile), this represents significant enlargement; entorhinal cortex volume measures 4,363 mm³, 9.9% above the reference mean. With a Z-score of 0.65 (74.2th percentile), this represents normal volume ; fusiform gyrus volume measures 22,299 mm³, 23.4% above the reference mean. With a Z-score of 2.03 (97.9th percentile), this represents significant enlargement; middle temporal gyrus volume measures 22,647 mm³, 12.3% above the reference mean. With a Z-score of 1.10 (86.4th percentile), this represents mild enlargement. ",
  "text_data": "Age is 82.1 years. Gender is Male. Education: 18 years. MMSE: 29.0. MoCA: 25.0. Logical Memory: 12.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows significant enlargement in multiple regions (hippocampus, whole brain, fusiform gyrus) with normal ventricular volume and no atrophy, which is atypical for Alzheimer's. Cognitive scores (MMSE 29, MoCA 25) are within normal limits for age, and APOE4-negative status further reduces Alzheimer's risk.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to unusual volumetric findings but normal cognition and no genetic risk)",
  "timestamp": "2025-07-26T06:12:47.078878"
}