{
  "ptid_time": "002_S_1268_2007-09-21",
  "img_path": "/data/qiuhui/data/adni/images/002_S_1268/2007-09-21/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 69,137 mm³, 47.0% above the reference mean. With a Z-score of 1.37 (91.4th percentile), this represents mild enlargement; hippocampal volume measures 6,528 mm³, 6.3% below the reference mean. With a Z-score of -0.55 (29.3th percentile), this represents normal volume ; whole brain volume measures 995,843 mm³, 3.2% below the reference mean. With a Z-score of -0.42 (33.6th percentile), this represents normal volume ; entorhinal cortex volume measures 4,406 mm³, 11.0% above the reference mean. With a Z-score of 0.72 (76.4th percentile), this represents normal volume ; fusiform gyrus volume measures 17,929 mm³, 0.8% below the reference mean. With a Z-score of -0.07 (47.4th percentile), this represents normal volume ; middle temporal gyrus volume measures 20,178 mm³, 0.0% above the reference mean. With a Z-score of 0.00 (50.1th percentile), this represents normal volume . ",
  "text_data": "Age is 83.2 years. Gender is Male. Education: 20 years. MMSE: 29.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: MCI.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows mild ventricular enlargement (47% above reference mean) but otherwise normal hippocampal, whole brain, and regional cortical volumes. The MMSE score of 29 is within the normal range, and there is no significant cognitive impairment reported. The presence of one APOE4 allele increases Alzheimer's risk but does not confirm pathology.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mild ventricular enlargement and APOE4 status, but no cognitive or structural red flags for MCI/dementia)",
  "timestamp": "2025-07-25T20:14:52.503541"
}