{
  "ptid_time": "005_S_0546_2008-02-28",
  "img_path": "/data/qiuhui/data/adni/images/005_S_0546/2008-02-28/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 24,131 mm³, 48.7% below the reference mean. With a Z-score of -1.41 (7.9th percentile), this represents mild atrophy; hippocampal volume measures 7,759 mm³, 11.3% above the reference mean. With a Z-score of 0.98 (83.7th percentile), this represents normal volume ; whole brain volume measures 913,973 mm³, 11.2% below the reference mean. With a Z-score of -1.47 (7.1th percentile), this represents mild atrophy; entorhinal cortex volume measures 3,662 mm³, 7.7% below the reference mean. With a Z-score of -0.51 (30.6th percentile), this represents normal volume ; fusiform gyrus volume measures 15,152 mm³, 16.1% below the reference mean. With a Z-score of -1.40 (8.1th percentile), this represents mild atrophy; middle temporal gyrus volume measures 18,536 mm³, 8.1% below the reference mean. With a Z-score of -0.73 (23.4th percentile), this represents normal volume . ",
  "text_data": "Age is 80.9 years. Gender is Male. Education: 16 years. MMSE: 28.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: MCI.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild atrophy in ventricular volume, whole brain volume, and fusiform gyrus, but hippocampal volume is normal (83.7th percentile). The MMSE score of 28 is within the normal range (≥26), suggesting intact cognitive function. Given the absence of significant memory or functional impairment, this does not meet criteria for MCI or dementia.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mild atrophy in some regions, but preserved hippocampal volume and normal MMSE)",
  "timestamp": "2025-07-25T21:08:13.003673"
}