{
  "ptid_time": "123_S_0298_2007-05-09",
  "img_path": "/data/qiuhui/data/adni/images/123_S_0298/2007-05-09/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 13,190 mm³, 65.8% below the reference mean. With a Z-score of -1.58 (5.8th percentile), this represents moderate atrophy; hippocampal volume measures 6,929 mm³, 8.3% below the reference mean. With a Z-score of -0.81 (20.8th percentile), this represents normal volume ; whole brain volume measures 1,023,360 mm³, 5.2% below the reference mean. With a Z-score of -0.67 (25.0th percentile), this represents normal volume ; entorhinal cortex volume measures 3,373 mm³, 17.7% below the reference mean. With a Z-score of -1.20 (11.4th percentile), this represents mild atrophy; fusiform gyrus volume measures 16,850 mm³, 10.6% below the reference mean. With a Z-score of -0.90 (18.4th percentile), this represents normal volume ; middle temporal gyrus volume measures 21,604 mm³, 1.2% above the reference mean. With a Z-score of 0.11 (54.4th percentile), this represents normal volume . ",
  "text_data": "Age is 77.4 years. Gender is Male. Education: 14 years. MMSE: 29.0. Logical Memory: 8.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The imaging data shows moderate ventricular atrophy and mild entorhinal cortex atrophy, but hippocampal and whole brain volumes are within normal ranges. The MMSE score of 29 is normal, and the absence of APOE4 reduces genetic risk.  \n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mild-moderate atrophy in some regions but preserved cognition)",
  "timestamp": "2025-07-26T12:27:03.407570"
}