{
  "ptid_time": "133_S_0433_2006-11-29",
  "img_path": "/data/qiuhui/data/adni/images/133_S_0433/2006-11-29/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 20,948 mm³, 43.3% below the reference mean. With a Z-score of -1.17 (12.1th percentile), this represents mild atrophy; hippocampal volume measures 6,921 mm³, 6.6% above the reference mean. With a Z-score of 0.53 (70.0th percentile), this represents normal volume ; whole brain volume measures 849,423 mm³, 8.5% below the reference mean. With a Z-score of -1.02 (15.4th percentile), this represents mild atrophy; entorhinal cortex volume measures 3,032 mm³, 12.4% below the reference mean. With a Z-score of -0.67 (25.1th percentile), this represents normal volume ; fusiform gyrus volume measures 12,479 mm³, 22.5% below the reference mean. With a Z-score of -1.69 (4.5th percentile), this represents moderate atrophy; middle temporal gyrus volume measures 17,847 mm³, 1.0% below the reference mean. With a Z-score of -0.09 (46.4th percentile), this represents normal volume . ",
  "text_data": "Age is 86.0 years. Gender is Female. Education: 14 years. MMSE: 29.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild to moderate atrophy in some regions (ventricular volume, whole brain, fusiform gyrus) but normal hippocampal and entorhinal cortex volumes, which are typically more affected in Alzheimer’s. The MMSE score of 29 is within the normal range, and the absence of APOE4 reduces genetic risk.  \n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (due to mixed atrophy findings but strong cognitive performance and lack of genetic risk)",
  "timestamp": "2025-07-26T15:15:07.251118"
}