{
  "ptid_time": "135_S_4356_2017-09-27",
  "img_path": "/data/qiuhui/data/adni/images/135_S_4356/2017-09-27/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 19,545 mm³, 49.3% below the reference mean. With a Z-score of -1.18 (11.9th percentile), this represents mild atrophy; hippocampal volume measures 8,435 mm³, 11.6% above the reference mean. With a Z-score of 1.13 (87.1th percentile), this represents mild enlargement; whole brain volume measures 1,069,300 mm³, 0.9% below the reference mean. With a Z-score of -0.12 (45.2th percentile), this represents normal volume ; entorhinal cortex volume measures 6,227 mm³, 51.9% above the reference mean. With a Z-score of 3.52 (100.0th percentile), this represents profound enlargement; fusiform gyrus volume measures 18,714 mm³, 0.7% below the reference mean. With a Z-score of -0.06 (47.8th percentile), this represents normal volume ; middle temporal gyrus volume measures 23,476 mm³, 10.0% above the reference mean. With a Z-score of 0.90 (81.6th percentile), this represents normal volume . ",
  "text_data": "Age is 74.1 years. Gender is Male. Education: 20 years. MMSE: 30.0. MoCA: 28.0. Logical Memory: 16.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 1.05 SUVR (normal ). ",
  "true_diagnosis": "Diagnosis: MCI.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild ventricular atrophy but otherwise normal or even enlarged volumes in key regions (hippocampus, entorhinal cortex, middle temporal gyrus), which is atypical for Alzheimer's. Cognitive scores (MMSE 30, MoCA 28) are normal, and amyloid PET (AV45) is negative, ruling out significant amyloid pathology.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T15:34:42.451431"
}