Purpose:To assess the clinical efficacy of integrating deep learning reconstruction(DLR)with contrast-enhancement-boost(CE-boost)in 80 kVp head and neck CT angiography(CTA)using substantially lowered radiation and con...Purpose:To assess the clinical efficacy of integrating deep learning reconstruction(DLR)with contrast-enhancement-boost(CE-boost)in 80 kVp head and neck CT angiography(CTA)using substantially lowered radiation and contrast medium(CM)doses,compared to the standard 100 kVp protocol using hybrid iterative reconstruction(HIR).Methods:Sixty-six patients were prospectively enrolled and randomly assigned to one of two groups:the low-dose group(n=33),receiving 80 kVp and 28 mL contrast medium(CM)with a noise index(NI)of 15;and the regular-dose group(n=33),receiving 100 kVp and 40 mL CM with an NI of 10.For the lowdose group,images underwent reconstruction using both hybrid iterative reconstruction(HIR)and deep learning reconstruction(DLR)at mild-,standard-,and strong-strength levels,both before and after combination with contrast enhancement-boost(CE-boost).This generated eight distinct datasets:L-HIR,L-DLR_(mild),L-DLR_(standard),L-DLR_(strong),L-HIR-CE,L-DLR_(mild)-CE,L-DLR_(standard)-CE,and L-DLR_(strong)-CE.Images for the regular-dose group were reconstructed solely with HIR(R-HIR).Quantitative analysis involved calculating and comparing CT attenuation,image noise,signal-to-noise ratio(SNR),and contrast-to-noise ratio(CNR)within six key vessels:the aortic arch(AA),internal carotid artery(ICA),external carotid artery(ECA),vertebral arteries(VA),basilar artery(BA),and middle cerebral artery(MCA).Two radiologists independently assessed subjective image quality using a 5-point scale,with statistical significance defined as P<0.05.Results:Compared to the regular-dose group,the low-dose protocol achieved a substantial reduction in contrast media volume(28 mL versus 40 mL,a 30%decrease)and radiation exposure((0.41±0.08)mSv versus(1.18±0.12)mSv,a 65%reduction).Both L-DLR_(standard) and L-DLR_(strong) delivered comparable or superior SNR and CNR across all vascular segments relative to R-HIR.However,subjective image quality scores for L-DLR at all strength levels fell below those for R-HIR(all P<0.05 for both readers).Combining CE-boost with the low-dose protocol significantly enhanced the objective image performance of L-DLR_(strong)-CE(all P<0.05)and produced subjective image scores comparable to R-HIR(reader 1:P=0.15;reader 2:P=0.06).Conclusion:When compared to the standard 100 kVp head and neck CTA,the combination of the DLR and CE-boost techniques at 80 kVp can achieve a 30%reduction in contrast dose and a 65%reduction in radiation dose,while maintaining both objective and subjective image quality.展开更多
目的:观察补肾解毒方对^(60)Coγ射线辐射后小鼠TLR4(Toll like receptor-4)信号转导通路下游相关炎性因子表达的影响并探讨其作用机制。方法:将背景为C57BL/10J的小鼠(TLR4^(+/+))完全随机分为TLR4^(+/+)空白对照组、TLR4^(+/+)辐射模...目的:观察补肾解毒方对^(60)Coγ射线辐射后小鼠TLR4(Toll like receptor-4)信号转导通路下游相关炎性因子表达的影响并探讨其作用机制。方法:将背景为C57BL/10J的小鼠(TLR4^(+/+))完全随机分为TLR4^(+/+)空白对照组、TLR4^(+/+)辐射模型组、TLR4^(+/+)中药组,同等背景下TLR4基因敲除小鼠(TLR4^(-/-))完全随机分为TLR4^(-/-)空白对照组、TLR4^(-/-)辐射模型组、TLR4^(-/-)中药组。除TLR4^(+/+)空白对照组、TLR4^(-/-)空白对照组外,其余四组小鼠均一次性接受^(60)Coγ射线6Gy剂量的全身照射,观察存活情况;记录各组小鼠辐射后第1、14、30天脾脏IL-6、IL-10、IL-17、IL-18、IFN-γ、TGF-β1的数值。结果:TLR4^(+/+)辐射模型组小鼠的脾脏IL-6、IL-17、IL-18、IFN-γ在辐射后第1d、第14d与空白对照组相比均有不同程度的增加,而TLR4^(+/+)辐射模型组小鼠的IL-10和TGF-β1与空白对照组相比则有明显减少。TLR4^(+/+)中药组小鼠的IL-6和IL-10在辐射后第1d均较模型组明显恢复,IL-17、IL-18在第14d部分恢复,TGF-β1在第14d明显恢复。TLR4^(-/-)辐射模型组小鼠的各炎性细胞因子相对空白对照组亦有不同程度的变化,但TLR4^(-/-)中药组小鼠的炎性细胞因子表达相对辐射模型组无明显统计学意义。结论:补肾解毒方通过TLR4信号途径能显著减轻核辐射损伤,影响各炎性细胞因子的表达。展开更多
基金National Natural Science Foundation of China(82001814)National High Level Hospital Clinical Research Funding(grant number 2022-PUMCH-B-067)+1 种基金National High Level Hospital Clinical Research Funding(grant number 2022-PUMCH-B-068)2021 SKY Imaging Research Fund of the Chinese Internatinal Medical Foundation(Z-2014-07-2101).
文摘Purpose:To assess the clinical efficacy of integrating deep learning reconstruction(DLR)with contrast-enhancement-boost(CE-boost)in 80 kVp head and neck CT angiography(CTA)using substantially lowered radiation and contrast medium(CM)doses,compared to the standard 100 kVp protocol using hybrid iterative reconstruction(HIR).Methods:Sixty-six patients were prospectively enrolled and randomly assigned to one of two groups:the low-dose group(n=33),receiving 80 kVp and 28 mL contrast medium(CM)with a noise index(NI)of 15;and the regular-dose group(n=33),receiving 100 kVp and 40 mL CM with an NI of 10.For the lowdose group,images underwent reconstruction using both hybrid iterative reconstruction(HIR)and deep learning reconstruction(DLR)at mild-,standard-,and strong-strength levels,both before and after combination with contrast enhancement-boost(CE-boost).This generated eight distinct datasets:L-HIR,L-DLR_(mild),L-DLR_(standard),L-DLR_(strong),L-HIR-CE,L-DLR_(mild)-CE,L-DLR_(standard)-CE,and L-DLR_(strong)-CE.Images for the regular-dose group were reconstructed solely with HIR(R-HIR).Quantitative analysis involved calculating and comparing CT attenuation,image noise,signal-to-noise ratio(SNR),and contrast-to-noise ratio(CNR)within six key vessels:the aortic arch(AA),internal carotid artery(ICA),external carotid artery(ECA),vertebral arteries(VA),basilar artery(BA),and middle cerebral artery(MCA).Two radiologists independently assessed subjective image quality using a 5-point scale,with statistical significance defined as P<0.05.Results:Compared to the regular-dose group,the low-dose protocol achieved a substantial reduction in contrast media volume(28 mL versus 40 mL,a 30%decrease)and radiation exposure((0.41±0.08)mSv versus(1.18±0.12)mSv,a 65%reduction).Both L-DLR_(standard) and L-DLR_(strong) delivered comparable or superior SNR and CNR across all vascular segments relative to R-HIR.However,subjective image quality scores for L-DLR at all strength levels fell below those for R-HIR(all P<0.05 for both readers).Combining CE-boost with the low-dose protocol significantly enhanced the objective image performance of L-DLR_(strong)-CE(all P<0.05)and produced subjective image scores comparable to R-HIR(reader 1:P=0.15;reader 2:P=0.06).Conclusion:When compared to the standard 100 kVp head and neck CTA,the combination of the DLR and CE-boost techniques at 80 kVp can achieve a 30%reduction in contrast dose and a 65%reduction in radiation dose,while maintaining both objective and subjective image quality.
文摘目的:观察补肾解毒方对^(60)Coγ射线辐射后小鼠TLR4(Toll like receptor-4)信号转导通路下游相关炎性因子表达的影响并探讨其作用机制。方法:将背景为C57BL/10J的小鼠(TLR4^(+/+))完全随机分为TLR4^(+/+)空白对照组、TLR4^(+/+)辐射模型组、TLR4^(+/+)中药组,同等背景下TLR4基因敲除小鼠(TLR4^(-/-))完全随机分为TLR4^(-/-)空白对照组、TLR4^(-/-)辐射模型组、TLR4^(-/-)中药组。除TLR4^(+/+)空白对照组、TLR4^(-/-)空白对照组外,其余四组小鼠均一次性接受^(60)Coγ射线6Gy剂量的全身照射,观察存活情况;记录各组小鼠辐射后第1、14、30天脾脏IL-6、IL-10、IL-17、IL-18、IFN-γ、TGF-β1的数值。结果:TLR4^(+/+)辐射模型组小鼠的脾脏IL-6、IL-17、IL-18、IFN-γ在辐射后第1d、第14d与空白对照组相比均有不同程度的增加,而TLR4^(+/+)辐射模型组小鼠的IL-10和TGF-β1与空白对照组相比则有明显减少。TLR4^(+/+)中药组小鼠的IL-6和IL-10在辐射后第1d均较模型组明显恢复,IL-17、IL-18在第14d部分恢复,TGF-β1在第14d明显恢复。TLR4^(-/-)辐射模型组小鼠的各炎性细胞因子相对空白对照组亦有不同程度的变化,但TLR4^(-/-)中药组小鼠的炎性细胞因子表达相对辐射模型组无明显统计学意义。结论:补肾解毒方通过TLR4信号途径能显著减轻核辐射损伤,影响各炎性细胞因子的表达。
