{
  "ptid_time": "114_S_6113_2018-02-20",
  "img_path": "/data/qiuhui/data/adni/images/114_S_6113/2018-02-20/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 61,697 mm³, 60.2% above the reference mean. With a Z-score of 1.44 (92.5th percentile), this represents mild enlargement; hippocampal volume measures 7,425 mm³, 1.8% below the reference mean. With a Z-score of -0.17 (43.1th percentile), this represents normal volume ; whole brain volume measures 1,011,380 mm³, 6.3% below the reference mean. With a Z-score of -0.82 (20.7th percentile), this represents normal volume ; entorhinal cortex volume measures 4,064 mm³, 0.9% below the reference mean. With a Z-score of -0.06 (47.6th percentile), this represents normal volume ; fusiform gyrus volume measures 15,696 mm³, 16.7% below the reference mean. With a Z-score of -1.42 (7.8th percentile), this represents mild atrophy; middle temporal gyrus volume measures 23,730 mm³, 11.2% above the reference mean. With a Z-score of 1.01 (84.3th percentile), this represents mild enlargement. ",
  "text_data": "Age is 76.2 years. Gender is Male. Education: 20 years. MMSE: 30.0. MoCA: 29.0. Logical Memory: 13.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 1.06 SUVR (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild ventricular enlargement and mild fusiform gyrus atrophy, but hippocampal, whole brain, and entorhinal cortex volumes are within normal ranges. Cognitive testing (MMSE 30, MoCA 29) is intact, and amyloid PET (AV45) is normal, with no APOE4 risk alleles.  \n\n**Diagnosis:** **CN (Cognitively Normal)**  \n**Confidence:** **High**  \n\n(No significant structural or biomarker evidence of neurodegeneration or amyloid pathology, and cognitive performance remains unimpaired.)",
  "timestamp": "2025-07-26T11:48:51.550175"
}