Theγ-rays are widely and abundantly present in strong nuclear radiation environments,and when they act on the camera equipment used to obtain environmental visual information on nuclear robots,radiation effects will ...Theγ-rays are widely and abundantly present in strong nuclear radiation environments,and when they act on the camera equipment used to obtain environmental visual information on nuclear robots,radiation effects will occur,which will degrade the performance of the camera system,reduce the imaging quality,and even cause catastrophic consequences.Color reducibility is an important index for evaluating the imaging quality of color camera,but its degradation mechanism in a nuclear radiation environment is still unclear.In this paper,theγ-ray irradiation experiments of CMOS cameras were carried out to analyse the degradation law of the camera’s color reducibility with cumulative irradiation and reveal the degradation mechanism of the color information of the CMOS camera underγ-ray irradiation.The results show that the spectral response of CMOS image sensor(CIS)and the spectral transmittance of lens after irradiation affect the values of a^(*)and b^(*)in the LAB color model.While the full well capacity(FWC)of CIS and transmittance of lens affect the value of L^(*)in the LAB color model,thus increase color difference and reduce brightness,the combined effect of color difference and brightness degradation will reduce the color reducibility of CMOS cameras.Therefore,the degradation of the color information of the CMOS camera afterγ-ray irradiation mainly comes from the changes in the FWC and spectral response of CIS,and the spectral transmittance of lens.展开更多
目的探讨3.0 T磁共振动态增强定量参数评估肝纤维化分期的可行性。方法家兔40只,随机分为实验组30只,对照组10只;实验组采用四氯化碳腹腔注射法建立肝纤维化模型,对照组清水及饲料喂养。于造模第6、8、10、12、16周末对兔行3.0 T磁共振...目的探讨3.0 T磁共振动态增强定量参数评估肝纤维化分期的可行性。方法家兔40只,随机分为实验组30只,对照组10只;实验组采用四氯化碳腹腔注射法建立肝纤维化模型,对照组清水及饲料喂养。于造模第6、8、10、12、16周末对兔行3.0 T磁共振动态增强扫描,获得肝脏定量灌注参数:K^trans、Kep、Ve。扫描结束后取肝组织行肝纤维化病理分期。统计学分析不同肝纤维化分期的MRI参数差异,各定量参数与肝纤维化分期的相关性,ROC曲线判别各参数诊断不同级别肝纤维化的敏感性和特异性,P〈0.05为差异有统计学意义。结果实验结束获取肝纤维化F0-F4分别为:10、8、7、9、6例。F0-F4,K^trans、Kep逐渐减低,组间有统计学差异(P〈0.05);Ve逐渐增加,组间没有统计学差异(P〉0.05)。K^trans、Kep值在F0 vs F1-4、F0-2 vs F3-4组间差异有统计学意义(P〈0.05)。K^trans、Kep与肝纤维化分期呈负相关(r=-0.739、-0.530,P〈0.005),Ve与肝纤维化分期呈正相关(r=0.306,P〈0.05)。ROC曲线分析,K^trans值对判别F0 vs F1-4、F0 vs F1-2、F0 vs F3-4、F0-2 vs F3-4的ROC曲线下的面积分别为0.878、0.770、0.967、0.898;Kep均值对判别F0 vs F1-4、F0 vs F1-2、F0 vs F3-4、F0-2 vs F3-4的ROC曲线下的面积分别为0.699、0.563、0.810、0.820。结论 3.0 T磁共振定量参数K^trans、K_(ep)可鉴别正常肝脏与肝纤维化,也有助于鉴别轻度-重度肝纤维化。展开更多
基金National Natural Science Foundation of China(11805269)West Light Talent Training Plan of the Chinese Academy of Sciences(2022-XBQNXZ-010)Science and Technology Innovation Leading Talent Project of Xinjiang Uygur Autonomous Region(2022TSYCLJ0042)。
文摘Theγ-rays are widely and abundantly present in strong nuclear radiation environments,and when they act on the camera equipment used to obtain environmental visual information on nuclear robots,radiation effects will occur,which will degrade the performance of the camera system,reduce the imaging quality,and even cause catastrophic consequences.Color reducibility is an important index for evaluating the imaging quality of color camera,but its degradation mechanism in a nuclear radiation environment is still unclear.In this paper,theγ-ray irradiation experiments of CMOS cameras were carried out to analyse the degradation law of the camera’s color reducibility with cumulative irradiation and reveal the degradation mechanism of the color information of the CMOS camera underγ-ray irradiation.The results show that the spectral response of CMOS image sensor(CIS)and the spectral transmittance of lens after irradiation affect the values of a^(*)and b^(*)in the LAB color model.While the full well capacity(FWC)of CIS and transmittance of lens affect the value of L^(*)in the LAB color model,thus increase color difference and reduce brightness,the combined effect of color difference and brightness degradation will reduce the color reducibility of CMOS cameras.Therefore,the degradation of the color information of the CMOS camera afterγ-ray irradiation mainly comes from the changes in the FWC and spectral response of CIS,and the spectral transmittance of lens.
文摘目的探讨3.0 T磁共振动态增强定量参数评估肝纤维化分期的可行性。方法家兔40只,随机分为实验组30只,对照组10只;实验组采用四氯化碳腹腔注射法建立肝纤维化模型,对照组清水及饲料喂养。于造模第6、8、10、12、16周末对兔行3.0 T磁共振动态增强扫描,获得肝脏定量灌注参数:K^trans、Kep、Ve。扫描结束后取肝组织行肝纤维化病理分期。统计学分析不同肝纤维化分期的MRI参数差异,各定量参数与肝纤维化分期的相关性,ROC曲线判别各参数诊断不同级别肝纤维化的敏感性和特异性,P〈0.05为差异有统计学意义。结果实验结束获取肝纤维化F0-F4分别为:10、8、7、9、6例。F0-F4,K^trans、Kep逐渐减低,组间有统计学差异(P〈0.05);Ve逐渐增加,组间没有统计学差异(P〉0.05)。K^trans、Kep值在F0 vs F1-4、F0-2 vs F3-4组间差异有统计学意义(P〈0.05)。K^trans、Kep与肝纤维化分期呈负相关(r=-0.739、-0.530,P〈0.005),Ve与肝纤维化分期呈正相关(r=0.306,P〈0.05)。ROC曲线分析,K^trans值对判别F0 vs F1-4、F0 vs F1-2、F0 vs F3-4、F0-2 vs F3-4的ROC曲线下的面积分别为0.878、0.770、0.967、0.898;Kep均值对判别F0 vs F1-4、F0 vs F1-2、F0 vs F3-4、F0-2 vs F3-4的ROC曲线下的面积分别为0.699、0.563、0.810、0.820。结论 3.0 T磁共振定量参数K^trans、K_(ep)可鉴别正常肝脏与肝纤维化,也有助于鉴别轻度-重度肝纤维化。