{
  "ptid_time": "094_S_0711_2008-08-14",
  "img_path": "/data/qiuhui/data/adni/images/094_S_0711/2008-08-14/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 35,490 mm³, 7.9% below the reference mean. With a Z-score of -0.19 (42.5th percentile), this represents normal volume ; hippocampal volume measures 6,842 mm³, 9.5% below the reference mean. With a Z-score of -0.93 (17.7th percentile), this represents normal volume ; whole brain volume measures 960,616 mm³, 11.0% below the reference mean. With a Z-score of -1.43 (7.7th percentile), this represents mild atrophy; entorhinal cortex volume measures 4,907 mm³, 19.7% above the reference mean. With a Z-score of 1.33 (90.9th percentile), this represents mild enlargement; fusiform gyrus volume measures 17,769 mm³, 5.7% below the reference mean. With a Z-score of -0.48 (31.4th percentile), this represents normal volume ; middle temporal gyrus volume measures 19,379 mm³, 9.2% below the reference mean. With a Z-score of -0.83 (20.4th percentile), this represents normal volume . ",
  "text_data": "Age is 79.3 years. Gender is Male. Education: 18 years. MMSE: 30.0. Logical Memory: 19.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild whole-brain atrophy (7.7th percentile) but otherwise normal hippocampal and ventricular volumes. The entorhinal cortex is mildly enlarged, which is atypical for Alzheimer’s but not necessarily pathological. The MMSE score of 30 is intact, and the absence of APOE4 reduces genetic risk.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mild whole-brain atrophy despite normal cognition)",
  "timestamp": "2025-07-26T10:13:38.663125"
}