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由于透视投影成像导致的血管重叠和投影缩短会引起血管狭窄估计及支架选择和放置错误，而血管重叠和投影缩短与造影角度的选择有关。
Vessel overlapping and foreshortening in angiographic images may cause errors in the assessment of lesions or the selection and placement of stents, and can be influenced by the viewing angles.
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