{
  "ptid_time": "141_S_0717_2007-09-21",
  "img_path": "/data/qiuhui/data/adni/images/141_S_0717/2007-09-21/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 39,116 mm³, 1.6% above the reference mean. With a Z-score of 0.04 (51.5th percentile), this represents normal volume ; hippocampal volume measures 9,083 mm³, 20.2% above the reference mean. With a Z-score of 1.97 (97.5th percentile), this represents moderate enlargement; whole brain volume measures 1,149,420 mm³, 6.5% above the reference mean. With a Z-score of 0.84 (80.0th percentile), this represents normal volume ; entorhinal cortex volume measures 4,798 mm³, 17.0% above the reference mean. With a Z-score of 1.15 (87.6th percentile), this represents mild enlargement; fusiform gyrus volume measures 19,928 mm³, 5.8% above the reference mean. With a Z-score of 0.49 (68.9th percentile), this represents normal volume ; middle temporal gyrus volume measures 21,844 mm³, 2.4% above the reference mean. With a Z-score of 0.21 (58.4th percentile), this represents normal volume . ",
  "text_data": "Age is 77.0 years. Gender is Male. Education: 12 years. MMSE: 29.0. Logical Memory: 10.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume measurements show no significant atrophy, with most structures (ventricular, whole brain, fusiform gyrus, middle temporal gyrus) within normal ranges. The hippocampal and entorhinal cortex volumes are actually enlarged, which is atypical for Alzheimer’s. The MMSE score of 29 is within the normal range, and the absence of APOE4 further reduces Alzheimer’s risk.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T16:47:04.552383"
}