{
  "ptid_time": "012_S_0637_2007-01-08",
  "img_path": "/data/qiuhui/data/adni/images/012_S_0637/2007-01-08/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 25,511 mm³, 9.1% below the reference mean. With a Z-score of -0.21 (41.7th percentile), this represents normal volume ; hippocampal volume measures 6,136 mm³, 13.8% below the reference mean. With a Z-score of -1.26 (10.4th percentile), this represents mild atrophy; whole brain volume measures 957,749 mm³, 1.7% below the reference mean. With a Z-score of -0.22 (41.4th percentile), this represents normal volume ; entorhinal cortex volume measures 3,278 mm³, 10.8% below the reference mean. With a Z-score of -0.66 (25.5th percentile), this represents normal volume ; fusiform gyrus volume measures 14,249 mm³, 16.2% below the reference mean. With a Z-score of -1.48 (7.0th percentile), this represents mild atrophy; middle temporal gyrus volume measures 19,006 mm³, 0.9% below the reference mean. With a Z-score of -0.07 (47.1th percentile), this represents normal volume . ",
  "text_data": "Age is 76.6 years. Gender is Female. Education: 16 years. MMSE: 30.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The hippocampal and fusiform gyrus volumes show mild atrophy (Z-scores of -1.26 and -1.48, respectively), which are early markers of Alzheimer's pathology. However, other brain regions are within normal limits, and the MMSE score of 30 is intact, with no reported cognitive complaints. APOE4-negative status also reduces Alzheimer's risk.  \n\n**Diagnosis:** **CN (Cognitively Normal)**  \n**Confidence:** **Medium** (Atrophy in key regions raises concern, but preserved cognition and normal MMSE suggest no functional impairment yet.)",
  "timestamp": "2025-07-25T23:04:59.151314"
}