螺旋CT仿真内窥镜在结肠隆起性病变的临床应用研究

目的 探讨螺旋ＣＴ仿真内窥镜（ＣＴＶＥ）诊断大肠隆起性病变的检查方法和临床应用价值。方法 ＣＴ扫描电流６５～１５０ｍＡ,螺距（ｐｉｔｃｈ）１．５～２ｍｍ。应用Ｖｏｙａｇｅｒ（导航者）软件,以不同视角、视距“飞越”形式观察,综合分析二维和三维影像,并与３２例结肠镜、１１例手术结果对照分析。结果 小电流、大螺距扫描法和小间距重建能显示直径３ｍｍ大小的隆起性病变,并能分辨表面形态。以结肠镜检查为标准,直

Study and clinical application of CT virtual endoscopy in neoplasms of colorectum

Objective To evaluate the methodology and clinical application of CT virtual endoscopy (CTVE) for diagnosing colorectal masses. Methods Fifty-three cases were classifid into 2 groups which underwent CT scans after the colon was cleaned and insufflated with air. The parameters used were:small milliampere(65 - 150 mA), large pitch (1 .5 - 2.0), and small interval (1 .5-2.0 mm). Reconstruction was done with 4D angio and voyager, different opacity were assigned and viewed by "fly-through". 3-dimensional images were compared with 2-dimensional images. Of the 53 cases, 32 cases were proved by colonoscopy and 11 cases by operation. Results The fecal debris retained was less in those who undrwent scans 1-2 h later after cleaning colon than those done within 30 min after cleaning the colon. CTVE allowed assessment of protuberant mass 3 mm in diameter and its morphology. Compeared with colonoscopy, detection rate by CTVE for masses 5 mm was 92%. Compared with operation, dstection rate by CFVE for masses < 5 mm was 74%. CT could evaluate the wall and outside structure of colon. Eight cases of colorectitis and 1 case of flat mass confirmed by colonoscope were missed by CTVE. Conclusion CTVE is a non-invasive method to detect colorectal masses, it can partially replace and is a supplement to colonoscopy.