...graphy OR tomography,X-ray computed) AND digital subtraction angiography • 截词检索 • 截词检索（truncation searching）：是利用截词符对检索词进行 局部截断，利用检索词的词干或不完整的词形加上截词符进行检索。
Compared with the standardpost-coding ratedistortion (PCRD) algorithm, the proposed algorithm has no spendingincalculatingrate-distortionslopeandsearching foroptimumtruncationpoints.