{
  "ptid_time": "116_S_0648_2009-08-12",
  "img_path": "/data/qiuhui/data/adni/images/116_S_0648/2009-08-12/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 14,861 mm³, 47.1% below the reference mean. With a Z-score of -1.08 (14.1th percentile), this represents mild atrophy; hippocampal volume measures 8,321 mm³, 17.0% above the reference mean. With a Z-score of 1.56 (94.0th percentile), this represents moderate enlargement; whole brain volume measures 1,142,340 mm³, 17.2% above the reference mean. With a Z-score of 2.17 (98.5th percentile), this represents significant enlargement; entorhinal cortex volume measures 4,054 mm³, 10.4% above the reference mean. With a Z-score of 0.64 (73.8th percentile), this represents normal volume ; fusiform gyrus volume measures 17,975 mm³, 5.7% above the reference mean. With a Z-score of 0.51 (69.7th percentile), this represents normal volume ; middle temporal gyrus volume measures 20,906 mm³, 9.1% above the reference mean. With a Z-score of 0.79 (78.4th percentile), this represents normal volume . ",
  "text_data": "Age is 74.5 years. Gender is Female. Education: 14 years. MMSE: 30.0. Logical Memory: 15.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild ventricular atrophy but otherwise normal-to-above-normal volumes in key regions (hippocampus, whole brain, entorhinal cortex, fusiform gyrus, middle temporal gyrus). Cognitive testing (MMSE 30/30) is intact, and there is no APOE4 genetic risk. The mild ventricular enlargement may reflect normal aging rather than neurodegeneration.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T11:55:40.253026"
}