{
  "ptid_time": "131_S_1301_2008-04-04",
  "img_path": "/data/qiuhui/data/adni/images/131_S_1301/2008-04-04/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 30,828 mm³, 9.8% above the reference mean. With a Z-score of 0.23 (58.9th percentile), this represents normal volume ; hippocampal volume measures 8,587 mm³, 20.7% above the reference mean. With a Z-score of 1.90 (97.1th percentile), this represents moderate enlargement; whole brain volume measures 1,061,120 mm³, 8.9% above the reference mean. With a Z-score of 1.12 (86.8th percentile), this represents mild enlargement; entorhinal cortex volume measures 3,501 mm³, 4.7% below the reference mean. With a Z-score of -0.29 (38.7th percentile), this represents normal volume ; fusiform gyrus volume measures 15,012 mm³, 11.8% below the reference mean. With a Z-score of -1.07 (14.2th percentile), this represents mild atrophy; middle temporal gyrus volume measures 19,587 mm³, 2.2% above the reference mean. With a Z-score of 0.19 (57.5th percentile), this represents normal volume . ",
  "text_data": "Age is 73.1 years. Gender is Female. Education: 18 years. MMSE: 30.0. Logical Memory: 21.0. Laboratory findings: . APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows mild atrophy in the fusiform gyrus but otherwise normal or even enlarged volumes in other regions, including the hippocampus. The MMSE score of 30 is within the normal range, and there are no significant cognitive deficits 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 the mild fusiform gyrus atrophy, but no other strong indicators of MCI or dementia)",
  "timestamp": "2025-07-26T15:10:31.923563"
}