CT自动管电流调节联合自适应迭代算法技术诊断肝血管瘤价值分析*

doi:10.3969/j.issn.1672-5069.2021.05.036

摘要/Abstract

摘要： 目的研究采取多层螺旋电子计算机断层扫描(CT)自动管电流调节(ATCM)和自适应迭代算法(ASIR)诊断肝血管瘤(HH)的临床价值。方法 2017年4月～2020年4月我院收治的HH患者144例,根据多层螺旋CT多期增强扫描预设噪声指数(NI)分为A组(平扫,NI设为9)、B组(动脉期,NI设为9)、C组(静脉期,NI设为11)和D组(延迟期,NI设为13),各组扫描时ASIR均设为50%。记录并分析各组图像噪声值、图像质量评分、图像剂量长度乘积(DLP)和有效剂量(ED)差异。结果本组各期(平扫、动脉期、静脉期和延迟期)图像质量均可满足诊断需要并获得最终诊断;A组图像质量评分为(4.9±0.3)分,显著高于C组和D组【分别为(4.4±0.4)分和(3.8±0.4)分,P＜0.05】,图像噪声值为(9.5±0.9)HU,显著低于B组、C组和D组【分别为(12.4±1.0)HU、(14.1±1.1)HU和(16.3±1.1)HU,P＜0.05】;B组图像质量评分为(4.8±0.3)分,显著高于C组和D组(P＜0.05),图像噪声值为(12.4±1.0)HU,显著低于C组和D组(P＜0.05); A组DLP和ED分别为(253.2±100.8)mGy-cm和(3.8±1.6)mSv,显著高于C组【分别为(174.5±80.2)mGy-cm和(2.6±1.1)mSv,P＜0.05】或D组【分别为(128.50±60.4)mGy-cm和(1.9±0.9)mSv,P＜0.05】;B组DLP和ED分别为(246.2±93.1)mGy-cm和(3.7±1.3)mSv,显著高于C组或D组(P＜0.05)。结论采取多层螺旋CT ATCM和ASIR技术检查HH患者在平扫和动脉期将NI设为9时,虽可提高图像质量,但辐射剂量偏高,而在静脉期和延迟期分别设定NI为11和13时,虽所获得的图像质量稍差,但并不影响诊断,而辐射剂量相对较小,值得临床斟酌选择。

关键词: 肝血管瘤, 电子计算机断层扫描, 自动管电流调节技术, 自适应迭代算法, 噪声指数, 诊断

Abstract: Objective The aim of this study was to explore the application of automatic tube current modulation (ATCM) and adaptive statistical iterative reconstruction (ASIR) in multilayer spiral computed tomography (CT) examination of patients with hepatic hemangioma (HH). Methods 144 patients with HH were encountered in our hospital between April 2017 and April 2020, andall underwent CT scan with different noise index (NI), e.g. in group A the NI was set to 9 in flat scan, in group B the NI was set to 9 in arterial phase, in group C the NI was set to 11 in venous phase, and in group D the NI was set to 13 in delayed phase and the ASIR was set to 50% in all scans. The image noise, image quality scores, image dose length product (DLP) and effective dose (ED) were calculated and compared. Results The image quality of CT scan met the needs of diagnosis and all obtain the final diagnosis in our series; the image quality score in group A was(4.9±0.3), significantly higher than (4.4±0.4) in group C or (3.8±0.4) in group D (P＜0.05), and the image noise was(9.5±0.9)HU, significantly lower than (12.4±1.0)HU in group B, or (14.1±1.1)HU in group C or (16.3±1.1)HU in group D (P＜0.05); the image quality score in group B was (4.8±0.3), significantly higher than in group C or in group D(P＜0.05), and the image noise was (12.4±1.0)HU, significantly lower than ingroup C or in group D(P＜0.05); the DLP and ED ingroup A were (253.2±100.8)mGy-cm and (3.8±1.6)mSv, significantly higher than(174.5±80.2)mGy-cm and (2.6±1.1)mSv in group C (P＜0.05) or (128.50±60.4)mGy-cm and (1.9±0.9)mSv in group D (P＜0.05); the DLP and ED in group B were (246.2±93.1)mGy-cm and (3.7±1.3)mSv, significantly higher than in group C or in group D(P＜0.05). Conclusion The application of ATCM and ASIR with the NI equal to 9 in multislice spiral CT examination in patients with HH could reduce the radiation dose and meet the requirement of diagnosis.

Key words: Hepatic hemangioma, Computed tomography, Automatic tube current modulation, Adaptive statistical iterative reconstruction, Noise index, Diagnosis

张武花, 栗海龙, 秦启斌, 史纲. CT自动管电流调节联合自适应迭代算法技术诊断肝血管瘤价值分析^*[J]. 实用肝脏病杂志, 2021, 24(5): 749-752.

Zhang Wuhua, Li Hailong, Qin Qibin. Improved CT diagnosis of patients with hepatic hemangioma by automatic tube current modulation and adaptive statistical iterative reconstruction[J]. Journal of Practical Hepatology, 2021, 24(5): 749-752.

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CT自动管电流调节联合自适应迭代算法技术诊断肝血管瘤价值分析^*

Improved CT diagnosis of patients with hepatic hemangioma by automatic tube current modulation and adaptive statistical iterative reconstruction

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