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按照标准操作规范，颈动脉超声包括颈总动脉、颈动脉杈及近端颈内动脉的两维(纵切面和横切面)图像。
Carotid ultrasound was by a standard protocol that consisted of two images at the common carotid, bifurcation, and proximal internal carotid arteries.
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