{
  "ptid_time": "003_S_6256_2018-03-13",
  "img_path": "/data/qiuhui/data/adni/images/003_S_6256/2018-03-13/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 28,701 mm³, 28.5% above the reference mean. With a Z-score of 0.71 (76.2th percentile), this represents normal volume ; hippocampal volume measures 6,764 mm³, 12.0% below the reference mean. With a Z-score of -1.34 (8.9th percentile), this represents mild atrophy; whole brain volume measures 957,987 mm³, 6.9% below the reference mean. With a Z-score of -0.86 (19.5th percentile), this represents normal volume ; entorhinal cortex volume measures 3,778 mm³, 3.0% below the reference mean. With a Z-score of -0.23 (41.0th percentile), this represents normal volume ; fusiform gyrus volume measures 17,618 mm³, 3.3% below the reference mean. With a Z-score of -0.37 (35.7th percentile), this represents normal volume ; middle temporal gyrus volume measures 18,830 mm³, 8.2% below the reference mean. With a Z-score of -0.73 (23.2th percentile), this represents normal volume . ",
  "text_data": "Age is 66.4 years. Gender is Female. Education: 16 years. MMSE: 30.0. MoCA: 28.0. Logical Memory: 20.0. APOEε4 alleles: 1.0. Biomarker levels: Florbetapir (AV45): 1.07 SUVR (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The hippocampal volume shows mild atrophy (Z-score -1.34, 8.9th percentile), which is a key biomarker for Alzheimer's disease, but all other brain volumes are within normal ranges. Cognitive scores (MMSE 30, MoCA 28) are intact, and amyloid PET (AV45) is normal, making Alzheimer's pathology less likely.  \n\n**Diagnosis:** **CN (Cognitively Normal)**  \n**Confidence:** **Medium** (due to hippocampal atrophy but normal cognition and amyloid status)",
  "timestamp": "2025-07-25T20:59:44.159256"
}