{
  "ptid_time": "021_S_5177_2018-07-18",
  "img_path": "/data/qiuhui/data/adni/images/021_S_5177/2018-07-18/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 32,614 mm³, 16.2% above the reference mean. With a Z-score of 0.37 (64.5th percentile), this represents normal volume ; hippocampal volume measures 7,672 mm³, 7.8% above the reference mean. With a Z-score of 0.72 (76.4th percentile), this represents normal volume ; whole brain volume measures 976,900 mm³, 0.2% above the reference mean. With a Z-score of 0.03 (51.2th percentile), this represents normal volume ; entorhinal cortex volume measures 4,123 mm³, 12.3% above the reference mean. With a Z-score of 0.75 (77.4th percentile), this represents normal volume ; fusiform gyrus volume measures 16,907 mm³, 0.6% below the reference mean. With a Z-score of -0.06 (47.7th percentile), this represents normal volume ; middle temporal gyrus volume measures 19,759 mm³, 3.1% above the reference mean. With a Z-score of 0.27 (60.5th percentile), this represents normal volume . ",
  "text_data": "Age is 77.5 years. Gender is Female. Education: 18 years. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** All brain volume measures (ventricular, hippocampal, whole brain, entorhinal cortex, fusiform gyrus, and middle temporal gyrus) are within normal ranges, with Z-scores close to or above the mean. There is no significant atrophy or structural abnormality suggestive of neurodegeneration. The absence of APOE4 further reduces genetic risk for Alzheimer’s.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T01:54:09.889010"
}