{
  "ptid_time": "137_S_4520_2013-03-25",
  "img_path": "/data/qiuhui/data/adni/images/137_S_4520/2013-03-25/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 14,078 mm³, 53.1% below the reference mean. With a Z-score of -1.26 (10.3th percentile), this represents mild atrophy; hippocampal volume measures 9,524 mm³, 18.6% above the reference mean. With a Z-score of 1.86 (96.9th percentile), this represents moderate enlargement; whole brain volume measures 1,188,380 mm³, 4.7% above the reference mean. With a Z-score of 0.67 (74.9th percentile), this represents normal volume ; entorhinal cortex volume measures 4,719 mm³, 10.7% above the reference mean. With a Z-score of 0.74 (77.1th percentile), this represents normal volume ; fusiform gyrus volume measures 19,516 mm³, 2.0% below the reference mean. With a Z-score of -0.16 (43.5th percentile), this represents normal volume ; middle temporal gyrus volume measures 20,377 mm³, 9.1% below the reference mean. With a Z-score of -0.75 (22.7th percentile), this represents normal volume . ",
  "text_data": "Age is 68.8 years. Gender is Male. Education: 16 years. MMSE: 30.0. MoCA: 25.0. Logical Memory: 14.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The data shows mild ventricular atrophy (Z-score -1.26) but otherwise normal or above-average volumes in key regions (hippocampus, whole brain, entorhinal cortex). Cognitive scores (MMSE 30, MoCA 25) are within normal limits, and the absence of APOE4 reduces genetic risk. No significant atrophy in Alzheimer’s-vulnerable regions (e.g., hippocampus, entorhinal cortex) is observed.  \n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mild ventricular atrophy, but no other concerning biomarkers or cognitive deficits)",
  "timestamp": "2025-07-26T16:34:19.655182"
}