{
  "ptid_time": "002_S_4799_2013-07-02",
  "img_path": "/data/qiuhui/data/adni/images/002_S_4799/2013-07-02/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 35,754 mm³, 19.1% above the reference mean. With a Z-score of 0.45 (67.5th percentile), this represents normal volume ; hippocampal volume measures 8,151 mm³, 1.5% above the reference mean. With a Z-score of 0.15 (56.1th percentile), this represents normal volume ; whole brain volume measures 1,207,650 mm³, 6.4% above the reference mean. With a Z-score of 0.91 (81.9th percentile), this represents normal volume ; entorhinal cortex volume measures 3,490 mm³, 18.1% below the reference mean. With a Z-score of -1.25 (10.5th percentile), this represents mild atrophy; fusiform gyrus volume measures 21,499 mm³, 8.0% above the reference mean. With a Z-score of 0.66 (74.7th percentile), this represents normal volume ; middle temporal gyrus volume measures 25,108 mm³, 12.0% above the reference mean. With a Z-score of 0.99 (83.9th percentile), this represents normal volume . ",
  "text_data": "Age is 69.0 years. Gender is Male. Education: 14 years. MMSE: 30.0. MoCA: 27.0. Logical Memory: 11.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The brain volume data shows mild atrophy in the entorhinal cortex (Z-score -1.25, 10.5th percentile), which is an early marker of Alzheimer’s pathology, but all other regions (hippocampus, whole brain, fusiform gyrus, middle temporal gyrus) are within normal ranges. Cognitive scores (MMSE 30, MoCA 27) are intact, and there is no APOE4 risk allele.  \n\n**Diagnosis:** **CN (Cognitively Normal)**  \n**Confidence:** **Medium** (due to isolated entorhinal atrophy but preserved cognition and no other risk factors)",
  "timestamp": "2025-07-25T20:32:04.329169"
}