{
  "ptid_time": "137_S_0669_2007-02-26",
  "img_path": "/data/qiuhui/data/adni/images/137_S_0669/2007-02-26/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 32,841 mm³, 9.4% above the reference mean. With a Z-score of 0.22 (58.8th percentile), this represents normal volume ; hippocampal volume measures 8,418 mm³, 4.9% above the reference mean. With a Z-score of 0.49 (68.7th percentile), this represents normal volume ; whole brain volume measures 1,143,780 mm³, 0.8% above the reference mean. With a Z-score of 0.12 (54.6th percentile), this represents normal volume ; entorhinal cortex volume measures 3,975 mm³, 6.8% below the reference mean. With a Z-score of -0.47 (32.0th percentile), this represents normal volume ; fusiform gyrus volume measures 18,020 mm³, 9.5% below the reference mean. With a Z-score of -0.79 (21.5th percentile), this represents normal volume ; middle temporal gyrus volume measures 19,471 mm³, 13.1% below the reference mean. With a Z-score of -1.08 (14.0th percentile), this represents mild atrophy. ",
  "text_data": "Age is 64.1 years. Gender is Male. Education: 13 years. MMSE: 29.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume measurements show mostly normal values, with only mild atrophy in the middle temporal gyrus (Z-score -1.08, 14th percentile). The hippocampal volume is normal (Z-score 0.49, 68.7th percentile), and the MMSE score of 29 is within the normal range. The presence of one APOE4 allele increases Alzheimer's risk but does not confirm pathology.  \n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mild temporal atrophy but otherwise normal cognitive and structural findings",
  "timestamp": "2025-07-26T16:14:27.105323"
}