{
  "ptid_time": "136_S_0086_2010-06-21",
  "img_path": "/data/qiuhui/data/adni/images/136_S_0086/2010-06-21/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 44,100 mm³, 19.3% above the reference mean. With a Z-score of 0.52 (69.9th percentile), this represents normal volume ; hippocampal volume measures 5,499 mm³, 15.3% below the reference mean. With a Z-score of -1.23 (11.0th percentile), this represents mild atrophy; whole brain volume measures 946,360 mm³, 2.0% above the reference mean. With a Z-score of 0.24 (59.3th percentile), this represents normal volume ; entorhinal cortex volume measures 4,004 mm³, 15.6% above the reference mean. With a Z-score of 0.84 (80.1th percentile), this represents normal volume ; fusiform gyrus volume measures 17,654 mm³, 9.6% above the reference mean. With a Z-score of 0.72 (76.4th percentile), this represents normal volume ; middle temporal gyrus volume measures 16,305 mm³, 9.6% below the reference mean. With a Z-score of -0.85 (19.7th percentile), this represents normal volume . ",
  "text_data": "Age is 84.3 years. Gender is Female. Education: 18 years. MMSE: 30.0. Logical Memory: 15.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The hippocampal volume shows mild atrophy (Z-score -1.23, 11th percentile), which is a key biomarker for Alzheimer's pathology. However, other brain regions (ventricular, whole brain, entorhinal cortex, fusiform gyrus, middle temporal gyrus) are within normal ranges, and cognitive performance (MMSE 30) is intact. The absence of APOE4 and preserved cognition suggest no significant impairment.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to hippocampal atrophy but otherwise normal findings)",
  "timestamp": "2025-07-26T15:55:07.815832"
}