{
  "ptid_time": "073_S_4795_2014-12-03",
  "img_path": "/data/qiuhui/data/adni/images/073_S_4795/2014-12-03/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 16,062 mm³, 46.5% below the reference mean. With a Z-score of -1.11 (13.5th percentile), this represents mild atrophy; hippocampal volume measures 9,856 mm³, 22.8% above the reference mean. With a Z-score of 2.28 (98.9th percentile), this represents significant enlargement; whole brain volume measures 1,291,640 mm³, 13.8% above the reference mean. With a Z-score of 1.96 (97.5th percentile), this represents moderate enlargement; entorhinal cortex volume measures 4,010 mm³, 5.9% below the reference mean. With a Z-score of -0.41 (34.1th percentile), this represents normal volume ; fusiform gyrus volume measures 21,674 mm³, 8.9% above the reference mean. With a Z-score of 0.74 (76.9th percentile), this represents normal volume ; middle temporal gyrus volume measures 24,445 mm³, 9.1% above the reference mean. With a Z-score of 0.75 (77.3th percentile), this represents normal volume . ",
  "text_data": "Age is 63.2 years. Gender is Male. Education: 16 years. MMSE: 29.0. MoCA: 28.0. Logical Memory: 17.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 0.99 SUVR (normal ); Amyloid beta: 1287.00 pg/mL (normal ); Total tau: 119.20 pg/mL (moderate reduced); Phosphorylated tau: 11.01 pg/mL (mild reduced). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild ventricular atrophy but otherwise largely normal or even enlarged volumes in key regions (hippocampus, whole brain, fusiform gyrus, middle temporal gyrus). Biomarkers (Aβ normal, reduced tau) and cognitive scores (MMSE 29, MoCA 28) do not suggest Alzheimer's pathology.  \n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T09:53:09.864698"
}