digital subtraction的用法和樣例：
例句
- Blood supply reestablishment of avascular necrosis of femoral head with digital subtraction angiography.
股骨頭壞死血供重建的數字減影血管造影研究。 - Lacrimal drainage system imaging by the digital subtraction dacryocystography provided reliable and accurate demonstration of lacrimal duct obstruction.
數字減影淚道造影術能夠提供清晰的淚道圖像並對淚道阻塞的部位及淚道改變作出準確的判斷。
