{
  "ptid_time": "141_S_0726_2007-03-13",
  "img_path": "/data/qiuhui/data/adni/images/141_S_0726/2007-03-13/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 42,800 mm³, 9.0% below the reference mean. With a Z-score of -0.26 (39.7th percentile), this represents normal volume ; hippocampal volume measures 7,008 mm³, 0.6% above the reference mean. With a Z-score of 0.05 (52.0th percentile), this represents normal volume ; whole brain volume measures 930,191 mm³, 9.6% below the reference mean. With a Z-score of -1.26 (10.4th percentile), this represents mild atrophy; entorhinal cortex volume measures 3,562 mm³, 10.3% below the reference mean. With a Z-score of -0.67 (25.1th percentile), this represents normal volume ; fusiform gyrus volume measures 15,103 mm³, 16.4% below the reference mean. With a Z-score of -1.42 (7.8th percentile), this represents mild atrophy; middle temporal gyrus volume measures 18,349 mm³, 9.0% below the reference mean. With a Z-score of -0.81 (20.9th percentile), this represents normal volume . ",
  "text_data": "Age is 81.5 years. Gender is Male. Education: 17 years. MMSE: 30.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild atrophy in the whole brain and fusiform gyrus, but hippocampal and entorhinal cortex volumes are within normal ranges. The MMSE score of 30 is intact, and there are no clear cognitive deficits reported.  \n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (While structural changes are present, the lack of cognitive impairment suggests normal aging rather than MCI or dementia.)",
  "timestamp": "2025-07-26T16:47:44.869849"
}