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.
目的探讨经直肠腔内超声对直肠肿瘤的诊断价值。
Objective To evaluate the diagnostic value of transrectal ultrasonography for rectal tumors.
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