{
  "ptid_time": "024_S_4084_2017-08-11",
  "img_path": "/data/qiuhui/data/adni/images/024_S_4084/2017-08-11/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 15,573 mm³, 44.5% below the reference mean. With a Z-score of -1.02 (15.4th percentile), this represents mild atrophy; hippocampal volume measures 8,119 mm³, 14.1% above the reference mean. With a Z-score of 1.29 (90.2th percentile), this represents mild enlargement; whole brain volume measures 1,069,380 mm³, 9.7% above the reference mean. With a Z-score of 1.22 (88.9th percentile), this represents mild enlargement; entorhinal cortex volume measures 4,345 mm³, 18.3% above the reference mean. With a Z-score of 1.12 (86.9th percentile), this represents mild enlargement; fusiform gyrus volume measures 18,192 mm³, 6.9% above the reference mean. With a Z-score of 0.63 (73.6th percentile), this represents normal volume ; middle temporal gyrus volume measures 23,084 mm³, 20.4% above the reference mean. With a Z-score of 1.77 (96.2th percentile), this represents moderate enlargement. ",
  "text_data": "Age is 74.4 years. Gender is Female. Education: 18 years. MMSE: 30.0. MoCA: 26.0. Logical Memory: 20.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 1.00 SUVR (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows mild ventricular atrophy but otherwise above-average volumes in key regions (hippocampus, whole brain, entorhinal cortex, middle temporal gyrus), which is atypical for Alzheimer's. Cognitive scores (MMSE 30, MoCA 26) are within normal limits, and amyloid PET (AV45) is normal. APOE4-negative status further reduces Alzheimer's risk.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T03:17:50.703027"
}