{
  "ptid_time": "137_S_4520_2012-09-26",
  "img_path": "/data/qiuhui/data/adni/images/137_S_4520/2012-09-26/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 14,380 mm³, 52.1% below the reference mean. With a Z-score of -1.24 (10.8th percentile), this represents mild atrophy; hippocampal volume measures 9,332 mm³, 16.3% above the reference mean. With a Z-score of 1.62 (94.8th percentile), this represents moderate enlargement; whole brain volume measures 1,193,340 mm³, 5.2% above the reference mean. With a Z-score of 0.73 (76.8th percentile), this represents normal volume ; entorhinal cortex volume measures 4,195 mm³, 1.6% below the reference mean. With a Z-score of -0.11 (45.6th percentile), this represents normal volume ; fusiform gyrus volume measures 20,024 mm³, 0.6% above the reference mean. With a Z-score of 0.05 (51.9th percentile), this represents normal volume ; middle temporal gyrus volume measures 20,326 mm³, 9.3% below the reference mean. With a Z-score of -0.77 (22.2th percentile), this represents normal volume . ",
  "text_data": "Age is 68.3 years. Gender is Male. Education: 16 years. MMSE: 30.0. MoCA: 26.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain imaging shows mild ventricular atrophy but otherwise normal or even enlarged hippocampal volume, with no significant atrophy in other key regions. Cognitive scores (MMSE 30, MoCA 26) are within normal limits, and the absence of APOE4 reduces genetic risk.  \n\n**Diagnosis:** CN (Cognitively Normal)  \n**Confidence:** Medium (MoCA is borderline, but imaging and MMSE support normal cognition)",
  "timestamp": "2025-07-26T16:34:08.759084"
}