Objective To study the value of direct digital radiography(DDR) in diagnosis of superficial esophageal carcinoma.
目的探讨直接数字成像对表浅食管癌的诊断价值。
Objective:To evaluate the value in detecting pulmonary tubercle(PT) on dual-energy subtraction(DES) with direct digital radiography (DDR).
前言： 目的：评价双能量减影在肺结核结节诊断中的应用价值。
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