Objective: To investigate ct and MRI features of pulmonary embolism and improve diagnosing value of CTPA and MRPA through analysis and comparison the CTPA and MRPA signs.
目的：通过对肺动脉栓塞的CT与MRI征象的分析和比较，探讨肺动脉栓塞的CTPA与MRPA的特征性表现，提高肺栓塞的CTPA与MRPA诊断应用价值。
In addition to some special USES of the relative words discussed in the third part, this pa per establishes a system of them through analysis and comparison in the first two parts.
本文除了在第三部分谈了关系词的一些特殊用法之外，主要是通过第一、二部分的分析和比较，确立了关系词的体系。
Through analysis and comparison, the correctness and feasibility of the present model and method were validated.
通过分析和比较，证实了本文模型和方法的正确性和可行性。
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