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

Abstract

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

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

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