{
  "ptid_time": "099_S_0090_2007-02-09",
  "img_path": "/data/qiuhui/data/adni/images/099_S_0090/2007-02-09/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 29,138 mm³, 24.4% below the reference mean. With a Z-score of -0.58 (28.0th percentile), this represents normal volume ; hippocampal volume measures 7,286 mm³, 3.6% below the reference mean. With a Z-score of -0.35 (36.2th percentile), this represents normal volume ; whole brain volume measures 995,336 mm³, 7.8% below the reference mean. With a Z-score of -1.01 (15.6th percentile), this represents mild atrophy; entorhinal cortex volume measures 4,115 mm³, 0.4% above the reference mean. With a Z-score of 0.02 (51.0th percentile), this represents normal volume ; fusiform gyrus volume measures 12,681 mm³, 32.7% below the reference mean. With a Z-score of -2.78 (0.3th percentile), this represents significant atrophy; middle temporal gyrus volume measures 19,866 mm³, 6.9% below the reference mean. With a Z-score of -0.62 (26.7th percentile), this represents normal volume . ",
  "text_data": "Age is 70.8 years. Gender is Male. Education: 20 years. MMSE: 30.0. Logical Memory: 16.0. APOEε4 alleles: 2.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "Reasoning: The patient shows mild whole brain atrophy and significant fusiform gyrus atrophy, but hippocampal and other key regions are within normal ranges. Despite structural changes, cognitive performance (MMSE 30) is intact, and APOE4 homozygosity increases AD risk but does not confirm pathology.  \nDiagnosis: CN (Cognitively Normal)  \nConfidence: Medium (due to conflicting markers: preserved cognition vs. APOE4 risk and fusiform atrophy)",
  "timestamp": "2025-07-26T10:52:58.029118"
}