自适应性统计迭代重建联合低管电压提高肝细胞癌患者肝脏CT三期增强扫描图像质量研究

目的 分析自适应性统计迭代重建(ASIR)联合低管电压用于CT肝脏三期增强扫描诊断原发性肝癌(PLC)对图像质量的影响.方法 2018年5月～2020年5月我院诊治的84例PLC患者,在行腹部CT增强扫描时,38例接受100 kV和ASIR扫描(观察组),另46例接受常规120 kV和滤过反投影(FBP)扫描(对照组)...

Image quality of adaptive statistical iterative reconstruction under low tube voltage of CT scan in diagnosis of patients with primary liver cancer

Objective The aim of this study was to investigate the image quality ofadaptive statistical iterative reconstruction (ASIR) under low tube voltage of CT scan in diagnosis of patients with primary liver cancer (PLC) . Methods 84 patients with PLC were encountered in our hospital between May 2018and May 2020, and all patients underwent CT examination, with ASIR under 100 kV scan in 38 patients (observation group) and filtered back projection (FBP) under normal 120kV scan in 46 patients (control group). The subjective indicators, such as noise, artifact, small structure, lesion display score, the Objective indicators, such as noise, signal to noise ratio and contrast signal to noise ratio in arterial phase, portal venous phase and delayed phase, and the CT dose index of volume (CTDIvol) and effective dose (ED) were recorded. Results The noise levels in arterial phase, portal vein phase and delayed phase in the observation group were (9.4±1.5) HU, (9.5±2.0) HU and (9.8±1.8) HU, significantly lower than in the control group, the signal-to-noise ratio in arterial phase and in delayed phase in the observation group were (9.1±1.6) and (10.6±2.1), significantly higher than in the control group, and the contrast signal to noise ratio in arterial phase and in delayed phase in the observation group were (3.1±0.9) and (4.6±1.5), significantly higher than in the control group; the scores of noise, fine structure, lesion display and artifact in arterial phase in the observation group were (1.4±0.6), (1.6±0.7),(1.2±0.6) and (1.2±0.5), significantly lower than in the control group; the score of noise, fine structure, lesion display and artifact in the delay phase in the observation group were (1.5±0.7),(1.7±0.8),(1.6±0.6) and (1.4±0.6), significantly lower than in the control group; the CTDIvol in the observation group was (6.4±1.7) mGy, significantly lower than and the ED was (2.3±0.7) mSv, significantly lower than in the control group. Conclusion The application of ASIR under low tube voltage fulfills the diagnostic requirement with good CT image quality and less radiation inpatients with PLC, which might need further clinical investigations.