64层螺旋CT螺距的不同设置在新型冠状病毒感染肺炎中筛查应用探讨

目的:探讨通过64层螺旋CT螺距参数的设置,降低新型冠状病毒肺炎患者筛查的辐射剂量和扫描时间的可行性。方法:前瞻性选择需进行新型冠状病毒肺炎筛查患者,按扫描时间随机分为大螺距组和对照组,每组各16例。大螺距组选择1.375∶1螺距,对照组选择0.984∶1螺距。对肺纹理、支气管、纵膈结构的图像质量;胸主动脉、竖脊肌、双肺肺实质;辐射剂量的客观数据进行评价和分析。结果:32例图像均符合影像诊断要求。伪影、肺纹理评分差异有统计学意义(P <0.05)。两组右肺CT值分别是(-804.62±45.43)HU和(-852.12±28.13)HU、左肺CT值分别是(-808.13±37.74)HU和(-858.77±19.95)HU,均具有统计学意义(P <0.05)。两组的扫描时间分别为(2.14±0.15)s和(3.14±0.28)s,具有统计学意义(P <0.05)。两组记录所得的容积CT剂量指数(CTDIvol)是(7.88±0.89)HU和(11.17±1.08)HU、剂量长度乘积(DLP)是(279.14±36.33)HU和(387.25±47.86)HU均具有统计...

Application of Different Settings of 64-slice Spiral CT in Screening of Novel Coronavirusinfected Pneumonia

Objective:To investigate the feasibility of reducing the radiation dose and scanning time of patients with novel coronavirus pneumonia by setting the parameters of 64-slice spiral CT. Methods:Prospective selection of patients who needed to be screened for novel coronavirus pneumonia was randomly divided into a large pitch group and a control group according to the scan time, with 16 cases in each group. The large-pitch group chose 1.375:1, and the control group chose 0.984:1.The image quality of lung markings, bronchus, and mediastinal structure, objective data of thoracic aorta, erector spinae, bilateral lung parenchyma, and radiation dose were evaluated and analyzed. Results:32 cases of images meet the requirements of imaging diagnosis. The artifact and lung markings scores were significantly different(P<0.05). The CT values of the right lung were-804.62 ±45.43 and(-852.12 ±28.13) HU, and the CT values of the left lung were(-808.13 ±37.74) HU and(-858.77 ± 19.95) HU, demonstrates statistically significant(P<0.05). The scanning time of the two groups was(2.14 ±0.15) s and(3.14 ±0.28) s, respectively, which was statistically significant(P<0.05). The volume CT dose index(CTDIvol) recorded by the two groups was(7.88 ±0.89) HU and(11.17 ±1.08) HU, and the dose length product(DLP) was(279.14 ±36.33) HU and(387.25 ±47.86) HU. Both were statistically significant(P<0.05). The effective dose(ED) were(3.91 ±0.51) HU and(5.42 ±0.67) HU, respectively, with statistical significance(P<0.05). Conclusion:The use of large-pitch scanning in CT screening of patients with novel coronavirus pneumonia can reduce the radiation dose, significantly shorten the scan time, and reduce the radiation dose received by patients and the risk of infection by radiation technicians without affecting the diagnosis of lesions. It as practical significance, and needs to be further promoted and verified.