目的探讨端扫式直肠超声对高位直肠癌患者进行术前腔内检查（TRUS）的方法与临床价值。
Objective To probe the methods and clinical value of transrectal ultrasound (TRUS) with head scanning probe in detecting upper rectal carcinoma.
目的探讨腔内彩色多普勒超声技术在直肠肿瘤诊断中的应用价值。
Purpose: To explore the value of transrectal color Doppler ultrasound in diagnosing rectal tumors.
目的探讨超声止血刀封合血管能够抵制管腔内多大高压以及血管封合的安全范围。
Objective To analyze the margin of safety by ultrasonically activated scalpel in sealing blood vascular.
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