{
  "ptid_time": "137_S_0686_2009-07-29",
  "img_path": "/data/qiuhui/data/adni/images/137_S_0686/2009-07-29/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 40,804 mm³, 5.9% above the reference mean. With a Z-score of 0.14 (55.7th percentile), this represents normal volume ; hippocampal volume measures 8,524 mm³, 12.8% above the reference mean. With a Z-score of 1.25 (89.3th percentile), this represents mild enlargement; whole brain volume measures 1,112,920 mm³, 3.1% above the reference mean. With a Z-score of 0.40 (65.7th percentile), this represents normal volume ; entorhinal cortex volume measures 3,877 mm³, 5.5% below the reference mean. With a Z-score of -0.37 (35.6th percentile), this represents normal volume ; fusiform gyrus volume measures 19,764 mm³, 4.9% above the reference mean. With a Z-score of 0.42 (66.2th percentile), this represents normal volume ; middle temporal gyrus volume measures 20,746 mm³, 2.8% below the reference mean. With a Z-score of -0.25 (40.1th percentile), this represents normal volume . ",
  "text_data": "Age is 75.0 years. Gender is Male. Education: 20 years. MMSE: 27.0. Logical Memory: 17.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume measurements are largely within normal ranges, with only mild enlargement of the hippocampus and a slightly reduced entorhinal cortex volume (still within normal limits). The MMSE score of 27 is within the normal range (≥26), and the absence of APOE4 alleles reduces genetic risk. No significant atrophy or cognitive impairment is evident.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** High",
  "timestamp": "2025-07-26T16:15:32.006496"
}