低管电压联合模型迭代重建技术在胃癌CT增强中的应用价值

张磊; 袁玉山; 马培旗; 彭彬; 胡献阔; 王震寰

doi:10.13898/j.cnki.issn.1000-2200.2021.09.024

低管电压联合模型迭代重建技术在胃癌CT增强中的应用价值

Application value of low-tube-voltage combined with iterative model reconstruction in the contrast-enhanced CT of gastric cancer

摘要

摘要:
目的探讨低管电压联合迭代模型重建（IMR）技术在胃癌CT增强中的应用价值。
方法选择胃癌病人54例，均行上腹部CT平扫和动态增强扫描，其中IMR重建组26例作为观察组，滤波反投影重建组28例作为对照组，收集2组门静脉期扫描数据，对2组图像分别进行主观评价、客观评价及有效剂量比较，并以术后病理为金标准，比较2组图像CT增强T分期的符合率。
结果观察组CT容积剂量指数、CT剂量长度乘积和有效剂量均明显低于对照组（P < 0.01），观察组图像信噪比、对比噪声比均明显大于对照组（P < 0.01），2组低对比分辨力和病灶边缘锐利度差异均有统计学意义（P < 0.05），而图像失真差异无统计学意义（P>0.05）。观察组胃癌CT增强T分期符合率为88.46%，高于对照组的64.29%（P < 0.05）。
结论低管电压联合IMR应用于胃癌CT增强显示，不仅能降低辐射剂量、提高图像质量，并有助于提高胃癌术前T分期诊断符合率。

Abstract:
ObjectiveTo explore the application value of low-tube-voltage combined with iterative model reconstruction(IMR) technique in the contrast-enhanced CT of gastric cancer.
MethodsThe upper abdominal CT scanning and dynamic enhanced scan in 54 gastric cancer patients were examined, and the 26 patients treated with IMR reconstruction and 28 patients treated with filtered back projection(FBP) reconstruction were divided into the observation group and control group, respectively.The portal vein phase scan data in two groups were collected, and the subjective evaluation, objective evaluation and effective dose comparison of the images in two groups were carried out.The postoperative pathology results were set as the gold standard, the coincidence rate of CT enhanced T staging was compared between two groups.
ResultsThe CT volumetric dose index, CT dose-length product and effective dose in observation group were significantly lower than those in control group(P < 0.01), and the image signal-to-noise ratio and contrast-to-noise ratio in observation group were significantly higher than those in control group(P < 0.01).The differences of the low contrast resolution and lesion edge sharpness between two groups were statistically significant(P < 0.05), while there was no statistical significance in image distortion between two groups(P>0.05).The coincidence rate of CT enhanced T staging in observation group(88.46%) was higher than that in control group(64.29%) (P < 0.05).
ConclusionsThe low-tube-voltage combined with IMR in the contrast-enhanced CT of gastric cancer can not only reduce the radiation dose and improve the image quality, but also help to improve the preoperative T-stage diagnosis coincidence rate of gastric cancer.

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