{
  "ptid_time": "129_S_6288_2018-04-02",
  "img_path": "/data/qiuhui/data/adni/images/129_S_6288/2018-04-02/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 48,071 mm³, 24.8% above the reference mean. With a Z-score of 0.59 (72.4th percentile), this represents normal volume ; hippocampal volume measures 7,686 mm³, 1.7% above the reference mean. With a Z-score of 0.16 (56.5th percentile), this represents normal volume ; whole brain volume measures 1,004,470 mm³, 6.9% below the reference mean. With a Z-score of -0.90 (18.4th percentile), this represents normal volume ; entorhinal cortex volume measures 4,221 mm³, 2.9% above the reference mean. With a Z-score of 0.20 (57.9th percentile), this represents normal volume ; fusiform gyrus volume measures 18,243 mm³, 3.2% below the reference mean. With a Z-score of -0.27 (39.4th percentile), this represents normal volume ; middle temporal gyrus volume measures 19,618 mm³, 8.1% below the reference mean. With a Z-score of -0.72 (23.4th percentile), this represents normal volume . ",
  "text_data": "Age is 72.6 years. Gender is Male. Education: 19 years. Handedness: Right. Race: White. MMSE: 30.0. MoCA: 28.0. Logical Memory: 16.0. APOEε4 alleles: 1.0. Biomarker levels: Florbetapir (AV45): 1.55 SUVR (profound elevated). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "Reasoning: The brain volume measurements (ventricular, hippocampal, whole brain, entorhinal cortex, fusiform gyrus, and middle temporal gyrus) all fall within normal ranges based on Z-scores and percentiles. Despite the profound elevation in AV45 (amyloid PET), cognitive scores (MMSE 30, MoCA 28) are intact, and there is no significant atrophy in Alzheimer’s-sensitive regions. APOE4 carrier status increases risk but does not confirm disease.  \nDiagnosis: CN (Cognitively Normal)  \nConfidence: Medium (due to conflicting amyloid positivity but preserved structure and cognition)",
  "timestamp": "2025-07-26T14:18:56.261720"
}