{
  "ptid_time": "109_S_1014_2007-08-15",
  "img_path": "/data/qiuhui/data/adni/images/109_S_1014/2007-08-15/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 39,754 mm³, 7.5% above the reference mean. With a Z-score of 0.20 (58.1th percentile), this represents normal volume ; hippocampal volume measures 8,239 mm³, 26.9% above the reference mean. With a Z-score of 2.15 (98.4th percentile), this represents significant enlargement; whole brain volume measures 990,570 mm³, 6.7% above the reference mean. With a Z-score of 0.81 (79.0th percentile), this represents normal volume ; entorhinal cortex volume measures 3,170 mm³, 8.5% below the reference mean. With a Z-score of -0.46 (32.4th percentile), this represents normal volume ; fusiform gyrus volume measures 13,894 mm³, 13.8% below the reference mean. With a Z-score of -1.03 (15.1th percentile), this represents mild atrophy; middle temporal gyrus volume measures 17,787 mm³, 1.3% below the reference mean. With a Z-score of -0.12 (45.3th percentile), this represents normal volume . ",
  "text_data": "Age is 85.2 years. Gender is Female. Education: 15 years. MMSE: 30.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The hippocampal volume is significantly enlarged (98.4th percentile), which is unusual for Alzheimer's but may reflect compensatory mechanisms or measurement variability. Fusiform gyrus shows mild atrophy (15.1th percentile), but other regions are within normal ranges. The MMSE score of 30 is intact, and there is no APOE4 risk allele.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to atypical hippocampal enlargement but otherwise normal findings)",
  "timestamp": "2025-07-26T11:29:16.066787"
}