{
  "ptid_time": "141_S_0726_2006-08-27",
  "img_path": "/data/qiuhui/data/adni/images/141_S_0726/2006-08-27/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 39,365 mm³, 16.3% below the reference mean. With a Z-score of -0.47 (31.8th percentile), this represents normal volume ; hippocampal volume measures 7,336 mm³, 5.3% above the reference mean. With a Z-score of 0.46 (67.6th percentile), this represents normal volume ; whole brain volume measures 961,607 mm³, 6.6% below the reference mean. With a Z-score of -0.86 (19.5th percentile), this represents normal volume ; entorhinal cortex volume measures 3,480 mm³, 12.3% below the reference mean. With a Z-score of -0.81 (21.0th percentile), this represents normal volume ; fusiform gyrus volume measures 15,861 mm³, 12.2% below the reference mean. With a Z-score of -1.06 (14.5th percentile), this represents mild atrophy; middle temporal gyrus volume measures 19,247 mm³, 4.6% below the reference mean. With a Z-score of -0.41 (34.1th percentile), this represents normal volume . ",
  "text_data": "Age is 81.0 years. Gender is Male. Education: 17 years. MMSE: 28.0. Logical Memory: 10.0. APOEε4 alleles: 1.0. Biomarker levels: Amyloid beta: 493.40 pg/mL (mild reduced); Total tau: 264.10 pg/mL (normal ); Phosphorylated tau: 24.16 pg/mL (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume measurements show mostly normal values, with only mild atrophy in the fusiform gyrus. The MMSE score of 28 is within the normal range, and while Aβ is mildly reduced, tau levels are normal. APOE4 carrier status increases Alzheimer's risk but does not confirm pathology alone.  \n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mild Aβ reduction and fusiform gyrus atrophy, but otherwise normal cognitive and biomarker profile)",
  "timestamp": "2025-07-26T16:47:36.106330"
}