{
  "ptid_time": "133_S_0771_2007-04-02",
  "img_path": "/data/qiuhui/data/adni/images/133_S_0771/2007-04-02/t1.nii.gz",
  "img_finding": "Image findings: ventricular volume measures 35,348 mm³, 25.9% above the reference mean. With a Z-score of 0.59 (72.4th percentile), this represents normal volume ; hippocampal volume measures 6,322 mm³, 11.1% below the reference mean. With a Z-score of -1.02 (15.3th percentile), this represents mild atrophy; whole brain volume measures 973,315 mm³, 0.1% below the reference mean. With a Z-score of -0.02 (49.3th percentile), this represents normal volume ; entorhinal cortex volume measures 3,566 mm³, 2.9% below the reference mean. With a Z-score of -0.18 (42.9th percentile), this represents normal volume ; fusiform gyrus volume measures 16,105 mm³, 5.3% below the reference mean. With a Z-score of -0.49 (31.4th percentile), this represents normal volume ; middle temporal gyrus volume measures 17,320 mm³, 9.6% below the reference mean. With a Z-score of -0.84 (20.1th percentile), this represents normal volume . ",
  "text_data": "Age is 74.6 years. Gender is Female. Education: 19 years. MMSE: 29.0. APOEε4 alleles: 0.0. ",
  "true_diagnosis": "Diagnosis: MCI.",
  "gpt_diagnosis": "**Reasoning:** The hippocampal volume shows mild atrophy (Z-score -1.02, 15.3th percentile), which is a key biomarker for Alzheimer's disease, while other brain regions are within normal ranges. However, cognitive performance (MMSE 29/30) remains intact, and the absence of APOE4 reduces genetic risk.  \n**Diagnosis:** Mild Cognitive Impairment (MCI)  \n**Confidence:** Medium  \n\n*(Rationale: Hippocampal atrophy suggests early neurodegeneration, but preserved cognition and lack of APOE4 make dementia less likely. MCI is the most fitting diagnosis, though confidence is medium due to the lack of longitudinal or biomarker data.)*",
  "timestamp": "2025-07-26T15:25:39.939647"
}