{
  "ptid_time": "136_S_0186_2010-05-25",
  "img_path": "/data/qiuhui/data/adni/images/136_S_0186/2010-05-25/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 55,142 mm³, 49.2% above the reference mean. With a Z-score of 1.33 (90.8th percentile), this represents mild enlargement; hippocampal volume measures 7,710 mm³, 18.7% above the reference mean. With a Z-score of 1.50 (93.3th percentile), this represents mild enlargement; whole brain volume measures 987,012 mm³, 6.3% above the reference mean. With a Z-score of 0.76 (77.7th percentile), this represents normal volume ; entorhinal cortex volume measures 3,884 mm³, 12.2% above the reference mean. With a Z-score of 0.66 (74.4th percentile), this represents normal volume ; fusiform gyrus volume measures 19,081 mm³, 18.4% above the reference mean. With a Z-score of 1.39 (91.7th percentile), this represents mild enlargement; middle temporal gyrus volume measures 19,385 mm³, 7.5% above the reference mean. With a Z-score of 0.67 (74.8th percentile), this represents normal volume . ",
  "text_data": "Age is 84.4 years. Gender is Female. Education: 16 years. MMSE: 29.0. Logical Memory: 17.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows mild enlargement in the ventricles and hippocampus, but other regions (whole brain, entorhinal cortex, middle temporal gyrus) are within normal ranges. The MMSE score of 29 is within the normal range (≥26), and the absence of APOE4 alleles reduces genetic risk for Alzheimer’s.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mild ventricular enlargement, but strong cognitive performance and no APOE4 risk)",
  "timestamp": "2025-07-26T15:58:05.198993"
}