{
  "ptid_time": "051_S_1123_2009-02-18",
  "img_path": "/data/qiuhui/data/adni/images/051_S_1123/2009-02-18/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 17,297 mm³, 38.4% below the reference mean. With a Z-score of -0.88 (19.0th percentile), this represents normal volume ; hippocampal volume measures 7,033 mm³, 1.1% below the reference mean. With a Z-score of -0.11 (45.8th percentile), this represents normal volume ; whole brain volume measures 857,295 mm³, 12.0% below the reference mean. With a Z-score of -1.52 (6.5th percentile), this represents moderate atrophy; entorhinal cortex volume measures 2,940 mm³, 20.0% below the reference mean. With a Z-score of -1.22 (11.0th percentile), this represents mild atrophy; fusiform gyrus volume measures 14,198 mm³, 16.5% below the reference mean. With a Z-score of -1.51 (6.6th percentile), this represents moderate atrophy; middle temporal gyrus volume measures 15,251 mm³, 20.4% below the reference mean. With a Z-score of -1.77 (3.8th percentile), this represents moderate atrophy. ",
  "text_data": "Age is 77.8 years. Gender is Female. Education: 16 years. MMSE: 29.0. Logical Memory: 7.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "Reasoning: The brain imaging shows moderate atrophy in whole brain, fusiform gyrus, and middle temporal gyrus, along with mild atrophy in the entorhinal cortex, while hippocampal and ventricular volumes are normal. Despite these structural changes, the MMSE score of 29 is within the normal range, suggesting preserved cognitive function. The presence of one APOE4 allele increases Alzheimer's risk but does not confirm impairment.  \n\nDiagnosis: CN (Cognitively Normal)  \nConfidence: Medium (due to structural atrophy without corresponding cognitive decline, but possible preclinical stage)",
  "timestamp": "2025-07-26T07:33:02.691314"
}