{
  "ptid_time": "941_S_4187_2019-06-25",
  "img_path": "/data/qiuhui/data/adni/images/941_S_4187/2019-06-25/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 20,995 mm³, 45.5% below the reference mean. With a Z-score of -1.09 (13.8th percentile), this represents mild atrophy; hippocampal volume measures 8,367 mm³, 10.7% above the reference mean. With a Z-score of 1.04 (85.1th percentile), this represents mild enlargement; whole brain volume measures 1,250,160 mm³, 15.8% above the reference mean. With a Z-score of 2.05 (98.0th percentile), this represents significant enlargement; entorhinal cortex volume measures 4,989 mm³, 21.7% above the reference mean. With a Z-score of 1.47 (92.9th percentile), this represents mild enlargement; fusiform gyrus volume measures 25,078 mm³, 33.1% above the reference mean. With a Z-score of 2.82 (99.8th percentile), this represents significant enlargement; middle temporal gyrus volume measures 24,548 mm³, 15.0% above the reference mean. With a Z-score of 1.35 (91.2th percentile), this represents mild enlargement. ",
  "text_data": "Age is 70.0 years. Gender is Male. Education: 16 years. MMSE: 28.0. MoCA: 25.0. Logical Memory: 16.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 1.01 SUVR (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild ventricular atrophy but otherwise significant enlargement in whole brain volume and key regions (hippocampus, entorhinal cortex, fusiform gyrus, middle temporal gyrus), which is atypical for Alzheimer's. Cognitive scores (MMSE 28, MoCA 25) are within normal limits, and amyloid PET (AV45) is negative, ruling out significant amyloid pathology.  \n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:**",
  "timestamp": "2025-07-26T17:36:26.272078"
}