{
  "ptid_time": "109_S_4499_2012-03-08",
  "img_path": "/data/qiuhui/data/adni/images/109_S_4499/2012-03-08/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 29,736 mm³, 36.8% below the reference mean. With a Z-score of -1.07 (14.3th percentile), this represents mild atrophy; hippocampal volume measures 7,681 mm³, 10.2% above the reference mean. With a Z-score of 0.88 (81.2th percentile), this represents normal volume ; whole brain volume measures 1,091,440 mm³, 6.1% above the reference mean. With a Z-score of 0.79 (78.6th percentile), this represents normal volume ; entorhinal cortex volume measures 3,930 mm³, 1.0% below the reference mean. With a Z-score of -0.06 (47.4th percentile), this represents normal volume ; fusiform gyrus volume measures 23,809 mm³, 31.8% above the reference mean. With a Z-score of 2.75 (99.7th percentile), this represents significant enlargement; middle temporal gyrus volume measures 23,076 mm³, 14.4% above the reference mean. With a Z-score of 1.29 (90.2th percentile), this represents mild enlargement. ",
  "text_data": "Age is 83.8 years. Gender is Male. Education: 20 years. MMSE: 28.0. MoCA: 26.0. Logical Memory: 9.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 0.96 SUVR (normal ); Total tau: 256.90 pg/mL (normal ); Phosphorylated tau: 26.29 pg/mL (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The imaging data shows mild ventricular atrophy but otherwise normal or even enlarged volumes in key regions (hippocampus, whole brain, entorhinal cortex, fusiform gyrus, middle temporal gyrus). Cognitive scores (MMSE 28, MoCA 26) are within normal limits for age, and biomarkers (T-tau, P-tau, AV45) are unremarkable. APOE4-negative status further reduces Alzheimer’s risk.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T11:34:11.292686"
}