{
  "ptid_time": "114_S_6524_2020-12-08",
  "img_path": "/data/qiuhui/data/adni/images/114_S_6524/2020-12-08/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 25,382 mm³, 13.6% above the reference mean. With a Z-score of 0.34 (63.4th percentile), this represents normal volume ; hippocampal volume measures 7,653 mm³, 0.4% below the reference mean. With a Z-score of -0.05 (48.2th percentile), this represents normal volume ; whole brain volume measures 999,267 mm³, 2.9% below the reference mean. With a Z-score of -0.36 (35.9th percentile), this represents normal volume ; entorhinal cortex volume measures 4,159 mm³, 6.8% above the reference mean. With a Z-score of 0.53 (70.2th percentile), this represents normal volume ; fusiform gyrus volume measures 16,854 mm³, 7.4% below the reference mean. With a Z-score of -0.84 (20.1th percentile), this represents normal volume ; middle temporal gyrus volume measures 19,520 mm³, 4.9% below the reference mean. With a Z-score of -0.43 (33.3th percentile), this represents normal volume . ",
  "text_data": "Age is 68.4 years. Gender is Female. Education: 12 years. MMSE: 29.0. MoCA: 29.0. Logical Memory: 16.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 0.95 SUVR (mild reduced). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** All brain volume measures (ventricular, hippocampal, whole brain, entorhinal cortex, fusiform gyrus, and middle temporal gyrus) fall within normal ranges based on Z-scores and percentiles. Cognitive scores (MMSE and MoCA) are both 29/30, indicating no significant cognitive impairment. The absence of APOE4 and only mild AV45 reduction further support normal aging rather than neurodegenerative pathology.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T11:50:34.922478"
}