{
  "ptid_time": "137_S_4520_2019-12-13",
  "img_path": "/data/qiuhui/data/adni/images/137_S_4520/2019-12-13/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 21,530 mm³, 44.1% below the reference mean. With a Z-score of -1.06 (14.5th percentile), this represents mild atrophy; hippocampal volume measures 8,813 mm³, 16.6% above the reference mean. With a Z-score of 1.62 (94.7th percentile), this represents moderate enlargement; whole brain volume measures 1,157,940 mm³, 7.3% above the reference mean. With a Z-score of 0.94 (82.8th percentile), this represents normal volume ; entorhinal cortex volume measures 5,173 mm³, 26.2% above the reference mean. With a Z-score of 1.77 (96.2th percentile), this represents moderate enlargement; fusiform gyrus volume measures 21,347 mm³, 13.3% above the reference mean. With a Z-score of 1.13 (87.2th percentile), this represents mild enlargement; middle temporal gyrus volume measures 21,875 mm³, 2.5% above the reference mean. With a Z-score of 0.23 (58.9th percentile), this represents normal volume . ",
  "text_data": "Age is 75.3 years. Gender is Male. Education: 16 years. MMSE: 28.0. MoCA: 24.0. Logical Memory: 12.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 1.27 SUVR (mild elevated). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The imaging data shows mild ventricular atrophy but otherwise normal-to-enlarged volumes in key regions (hippocampus, entorhinal cortex, fusiform gyrus), which is atypical for Alzheimer's. Cognitive scores (MMSE 28, MoCA 24) are borderline for MCI but not dementia. APOE4-negative status and only mild amyloid (AV45) further reduce Alzheimer's likelihood.  \n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (atypical volumetric findings warrant caution, but clinical and biomarker data support normal cognition)",
  "timestamp": "2025-07-26T16:34:56.619118"
}