CT理论与应用研究2026，Vol.35Issue(2)：203-211,9.DOI:10.15953/j.ctta.2025.134
虚拟单能成像Mono+技术分辨率参数对图像噪声的影响:质控体模及示例患者研究
Influence of Mono+Technique Parameter on Noise Power Spectrum of Virtual Monoenergetic Imaging:A Study Using a Quality Control Phantom and a Sample Patient
摘要
Abstract
Objective:To explore the impact of Mono technology and resolution parameter in Mono+technology on image quality with the goal of providing reference for the appropriate selection of these post-processing parameters in virtual monoenergetic images(VMI).Methods:The data included a computed tomography(CT)quality control phantom scanned in energy mode and portal venous phase data of contrast-enhanced upper abdomen energy CT scan of a sample patient.Mono and Mono+technologies with different resolution parameters(1–10)and a default setting of 2 were used to reconstruct 70 keV VMIs.The noise power spectrum(NPS)was employed to analyze the image noise characteristics of both phantom and patient.The CT value,standard deviation(SD),signal-to-noise ratio(SNR),and contrast-to-noise ratio(CNR)of the liver parenchyma,and edge rise slope(ERS)between the liver parenchyma and portal vein were measured and calculated in the sample patient.Results:The NPS curves of the phantom showed that image noise was most pronounced with Mono technology and gradually increased with higher resolution parameters in Mono+technology.The NPS curves for the patient exhibited a trend similar to that of the phantom.The average and peak spatial frequency values of NPS curves did not differ significantly and CT values of the liver parenchyma remained stable across different reconstruction techniques.However,the SD values of the liver parenchyma were lower at lower resolution parameters in Mono+technology,corresponding to relatively higher SNR and CNR values.The ERS value between the liver parenchyma and portal vein was the lowest when the resolution parameter in Mono+technology was 2.The ERS gradually increased as resolution increased.Conclusion:Mono+technology can reduce image noise compared to Mono technology without significantly altering image texture.The increased resolution in Mono+technology can improve image sharpness at the expense of higher image noise.Optimized SNR and CNR values can be obtained using the default resolution parameter settings of Mono+technology,but the corresponding ERS may be low.关键词
X线计算机体层摄影/虚拟单能量成像/图像质量/噪声功率谱Key words
X-ray computed tomography/virtual monoenergetic imaging/image quality/noise power spectrum分类
医药卫生引用本文复制引用
王思连,星月,胡扬帆,许芷菡,宋阳,褚敬申,张欢,姚伟武,钟京谕..虚拟单能成像Mono+技术分辨率参数对图像噪声的影响:质控体模及示例患者研究[J].CT理论与应用研究,2026,35(2):203-211,9.基金项目
国家自然科学基金(基于CT增强影像组学联合代谢组学构建急性胰腺炎重症化智能早期预警模型研究(82302183) （基于CT增强影像组学联合代谢组学构建急性胰腺炎重症化智能早期预警模型研究(82302183）
基于注意力-可解释图文信息挖掘创建膝骨关节炎交互式诊断报告系统(82471935) （82471935）
厌氧消化链球菌重塑局部进展期直肠癌免疫微环境及MR预测模型研究(82271934)) （82271934）
上海市卫生健康委员会项目(骨病多模态报告和数据系统(Bone-RADS)规范精准风险评估并优化诊疗管理建议的临床研究(20244Y0214)) （骨病多模态报告和数据系统(Bone-RADS）
上海市长宁区卫生健康委员会项目(骨报告和数据系统(Bone-RADS)在成人偶发孤立性骨病变CT和MRI诊断及临床管理中的可行性和有效性研究(2023QN01)). （骨报告和数据系统(Bone-RADS）
