{
  "ptid_time": "082_S_6629_2018-11-23",
  "img_path": "/data/qiuhui/data/adni/images/082_S_6629/2018-11-23/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 11,809 mm³, 36.6% below the reference mean. With a Z-score of -1.05 (14.8th percentile), this represents mild atrophy; hippocampal volume measures 7,417 mm³, 5.0% below the reference mean. With a Z-score of -0.70 (24.3th percentile), this represents normal volume ; whole brain volume measures 1,016,320 mm³, 2.3% below the reference mean. With a Z-score of -0.28 (39.0th percentile), this represents normal volume ; entorhinal cortex volume measures 3,091 mm³, 16.4% below the reference mean. With a Z-score of -1.28 (10.0th percentile), this represents mild atrophy; fusiform gyrus volume measures 18,151 mm³, 1.5% below the reference mean. With a Z-score of -0.14 (44.5th percentile), this represents normal volume ; middle temporal gyrus volume measures 22,453 mm³, 9.4% above the reference mean. With a Z-score of 0.77 (78.0th percentile), this represents normal volume . ",
  "text_data": "Age is 57.0 years. Gender is Female. Education: 14 years. Handedness: Right. Race: Black or African American. MMSE: 30.0. MoCA: 29.0. Logical Memory: 7.0. APOEε4 alleles: 0.0. Biomarker levels: Florbetapir (AV45): 0.98 SUVR (normal ). ",
  "true_diagnosis": "Diagnosis: CN.",
  "gpt_diagnosis": "**Reasoning:** The imaging shows mild atrophy in the ventricular volume and entorhinal cortex, but hippocampal and whole brain volumes are within normal ranges. Cognitive scores (MMSE 30, MoCA 29) are intact, and amyloid PET (AV45) is normal, with no APOE4 risk allele.  \n\n**Diagnosis:** **CN (Cognitively Normal)**  \n**Confidence:** **High**  \n\n(Mild atrophy in some regions is not unusual for age, and the absence of cognitive impairment or biomarker evidence of Alzheimer’s pathology strongly supports normal aging.)",
  "timestamp": "2025-07-26T10:10:31.467329"
}