Clinical Value of Double Low Examination Technique Based on KARL 3D Iterative Reconstruction Algorithm in Bronchial Artery Imaging
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摘要: 目的：探讨基于KARL 3D迭代重建算法双低检查技术在支气管动脉成像中的临床价值。方法：回顾性分析2020年7月至9月武汉市肺科医院收治的60例咯血患者的临床影像资料，随机抽取采用A方案患者30例，采用B方案患者30例。A组采用120 kV，对比剂80 mL，FBP重建图像；B组采用100 kV，对比剂65 mL，分别进行KARL 3D 5级和FBP重建图像。比较两组图像质量主观评分，客观评价及辐射剂量差异。结果：B组KARL 3D 5级重建图像质量与A组差异无统计学意义，两者均满足CTA诊断要求。B组KARL 3D 5级重建图像较FBP重建图像相比，图像噪声下降，图像质量提高，差异有统计学意义。B组有效剂量低于A组差异有统计学意义。结论：基于KARL 3D迭代重建算法采用低管电压和低对比剂用量所获支气管动脉图像可以满足诊断要求，同时也能降低患者自身所受辐射剂量和对比剂用量。Abstract: Objective: We intend to explore the clinical value of double-low (low tube electrodepressed contrast agent dosage) examination technique which is based on KARL 3D iterative reconstruction when applied in bronchial artery imaging. Methods: We performed retrospective analysis on the clinical imaging data of 60 patients with hemoptysis treated in Wuhan Pulmonary Hospital from July to September 2020. 30 patients were randomly selected to use plan A while the rest 30 adopted plan B. In group A, 120 kV and 80 mL contrast agent dosage were used for FBP image reconstruction; in group B, 100 kV and 65mL contrast agent dosage were used for KARL 3D grade 5 and FBP image reconstruction respectively. We compared the subjective grade, objective evaluation and radiation dose difference of the image quality between the two groups. Results: There was no statistically significant difference in KARLl 3D grade 5 reconstruction image qualities between the two groups, and both groups met the diagnostic requirements of CTA. Compared with the FBP image, we found that the noise of the KARLl 3D level 5 reconstruction images in group B decreased and the image quality improved, the difference held statistical meaning. The effective dose of group B was lower than that of group A, and the difference held statistical meaning. Conclusion: The bronchial artery images obtained by using low tube voltage and low contrast agent dosage based on KARL 3D iterative reconstruction algorithm can meet the diagnostic requirements and in the mean time reduce the radiation dose and contrast agent dosage used on the patients.
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