{
  "ptid_time": "082_S_1256_2007-10-04",
  "img_path": "/data/qiuhui/data/adni/images/082_S_1256/2007-10-04/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 8,413 mm³, 70.0% below the reference mean. With a Z-score of -1.60 (5.4th percentile), this represents moderate atrophy; hippocampal volume measures 6,978 mm³, 1.9% below the reference mean. With a Z-score of -0.18 (43.0th percentile), this represents normal volume ; whole brain volume measures 965,007 mm³, 1.0% below the reference mean. With a Z-score of -0.12 (45.0th percentile), this represents normal volume ; entorhinal cortex volume measures 4,368 mm³, 18.9% above the reference mean. With a Z-score of 1.16 (87.7th percentile), this represents mild enlargement; fusiform gyrus volume measures 19,530 mm³, 14.8% above the reference mean. With a Z-score of 1.35 (91.1th percentile), this represents mild enlargement; middle temporal gyrus volume measures 19,601 mm³, 2.3% above the reference mean. With a Z-score of 0.20 (57.7th percentile), this represents normal volume . ",
  "text_data": "Age is 72.1 years. Gender is Female. Education: 17 years. MMSE: 30.0. APOEε4 alleles: 1.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The ventricular volume shows moderate atrophy (Z-score -1.60), but hippocampal, whole brain, and middle temporal gyrus volumes are within normal ranges. The entorhinal cortex and fusiform gyrus show mild enlargement, which is atypical for Alzheimer’s. The MMSE score of 30 is intact, and APOE4 status (heterozygous) alone does not confirm pathology.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to ventricular atrophy but otherwise normal cognitive and structural findings)",
  "timestamp": "2025-07-26T10:01:26.018564"
}