目的:分析Brain Time Stack图像融合技术在CT中的应用。方法:选取2021年3月—2022年9月衡水市第四人民医院收治的50例CT检查患者作为研究对象。所有患者进行CT检查并进行Brain Time Stack后处理。比较四组不同部位CT值、标准差(SD)、信...目的:分析Brain Time Stack图像融合技术在CT中的应用。方法:选取2021年3月—2022年9月衡水市第四人民医院收治的50例CT检查患者作为研究对象。所有患者进行CT检查并进行Brain Time Stack后处理。比较四组不同部位CT值、标准差(SD)、信噪比(SNR)。比较四组图像主观质量评分。分析不同部位CT值、SD、SNR与图像主观质量评分的相关性。结果:B组的延髓、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉CT值明显低于A组;C组的延髓、脑室、额叶白质、小脑内侧、小脑外侧、颞肌肌肉CT值高于A组;D组延髓、额叶灰质、颞肌肌肉CT值明显低于A组,脑室、额叶白质、小脑外侧CT值明显高于A组;C组延髓、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉CT值明显高于B组;D组延髓、脑室、额叶白质、小脑内侧、小脑外侧、颞肌肌肉CT值明显高于B组;D组延髓、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉CT值明显低于C组;D组脑室CT值明显高于C组,差异有统计学意义(P<0.05)。B组、C组、D组延髓、脑室、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉SD值明显低于A组;C组延髓、脑室、额叶白质、小脑内侧、小脑外侧、颞肌肌肉SD值均明显高于B组;C组额叶灰质SD明显低于B组;D组延髓、脑室、额叶灰质、额叶白质、小脑内侧、小脑外侧、肌肉SD均明显低于B组、C组,差异有统计学意义(P<0.05)。B组、C组、D组延髓、脑室、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉SNR均明显高于A组;C组、D组延髓、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉SNR值明显高于B组;C组、D组脑室SNR明显低于B组;D组延髓、脑室、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉SNR明显高于C组,差异有统计学意义(P<0.05)。D组图像主观质量评分最高,差异有统计学意义(P<0.05)。延髓、脑室、额叶灰质、额叶白质、小脑内侧、小脑外侧及颞肌肌肉SD与主观质量评分呈明显负相关,SNR与主观质量评分间呈明显正相关,差异有统计学意义(P<0.05)。结论:利用Brain Time Stack图像融合技术对头部CT扫描检查图像处理,动脉期结合前一期及后一期的图像数据在处理后具有更好的质量和更少的噪音。展开更多
Spectroscopic measurements and terahertz imaging of the cornea are carried out by using a rapid scanning terahertz time domain spectroscopy(THz-TDS) system.A voice coil motor stage based optical delay line(VCM-ODL...Spectroscopic measurements and terahertz imaging of the cornea are carried out by using a rapid scanning terahertz time domain spectroscopy(THz-TDS) system.A voice coil motor stage based optical delay line(VCM-ODL) is developed to provide a rather simple and robust structure with both the high scanning speed and the large delay length.The developed system is used for THz spectroscopic measurements and imaging of the corneal tissue with different amounts of water content,and the measurement results show the consistence with the reported results,in which the measurement time using VCM-ODL is a factor of 360 shorter than the traditional motorized optical delay line(MDL).With reducing the water content a monotonic decrease of the complex permittivity of the cornea is observed.The two-term Debye relaxation model is employed to explain our experimental results,revealing that the fast relaxation time of a dehydrated cornea is much larger than that of a hydrated cornea and its dielectric behavior can be affected by the presence of the biological macromolecules.These results demonstrate that our THz spectrometer may be a promising candidate for tissue hydration sensing and practical application of THz technology.展开更多
A laser scanning confocal imaging-surface plasmon resonance (LSCI-SPR) instrument integrated with a wavelength-dependent surface plasmon resonance (SPR) sensor and a laser scanning confocal microscopy (LSCM) is ...A laser scanning confocal imaging-surface plasmon resonance (LSCI-SPR) instrument integrated with a wavelength-dependent surface plasmon resonance (SPR) sensor and a laser scanning confocal microscopy (LSCM) is built to detect the bonding process of human IgG and fluorescent-labeled affinity purified antibodies in real time. The shifts of resonant wavelength at different reaction time stages are obtained by SPR, corresponding well with the changes of the fluorescence intensity collected by using LSCM. The instrument shows the merits of the combination and complementation of the SPR and LSCM, with such advantages as quantificational analysis, high spatial resolution and real time monitor, which are of great importance for practical applications in biosensor and life science.展开更多
In order to optimize the transitional time during the successive exposure scans for a step-and-scanlithography and improve the productivity in a wafer production process,an investigation of the motion tra-jectory plan...In order to optimize the transitional time during the successive exposure scans for a step-and-scanlithography and improve the productivity in a wafer production process,an investigation of the motion tra-jectory planning along the scanning direction for wafer stage was carried out.The motions of wafer stagewere divided into two respective logical moves(i.e.step-move and scan-move)and the multi-motion-overlap algorithms(MMOA)were presented for optimizing the transitional time between the successive ex-posure scans.The conventional motion planning method,the Hazehon method and the MMOA were ana-lyzed theoretically and simulated using MATLAB under four different exposure field sizes.The resultsshow that the total time between two successive scans consumed by MMOA is reduced by 4.82%,2.62%,3.06% and 3.96%,compared with those of the conventional motion planning method;and re-duced by 2.58%,0.76%,1.63% and 2.92%,compared with those of the Hazelton method respec-tively.The theoretical analyses and simulation results illuminate that the MMOA can effectively minimizethe transitional step time between successive exposure scans and therefore increase the wafer fabricatingproductivity.展开更多
SLAM的全称为Simultaneous Localization And Mapping即“同时定位与地图构建”。最近几年由于机器人、无人机、自动驾驶、AI、VR和AR技术的发展,SLAM技术逐渐被人们熟知。SLAM技术是通过激光传感器感知周围的环境,并将不同时刻感知的...SLAM的全称为Simultaneous Localization And Mapping即“同时定位与地图构建”。最近几年由于机器人、无人机、自动驾驶、AI、VR和AR技术的发展,SLAM技术逐渐被人们熟知。SLAM技术是通过激光传感器感知周围的环境,并将不同时刻感知的环境进行匹配套合,从而反推本体在环境中的位置及运动轨迹。随着SLAM技术的设备及定位精度的提高,该技术逐渐在测绘行业中使用,迅速成为除RTK和全站仪采点成图之外的一种地形图成图手段。国外GeoSLAM等公司推出大量的产品,在该领域处于领先地位,为打破国外封锁,国内的飞马、数字绿土等公司也研发出相应的产品。该文主要通过具体的案例论述国产手持激光雷达扫描仪飞马SLAM 100在地形测绘中的运用,侧重于表述SLAM技术及SLAM100产品在运用中的优缺点。展开更多
目的了解医务人员佩戴医用防护口罩的行为现状,并分析未能规范佩戴医用防护口罩的影响因素,为改进口罩佩戴相关培训提供依据。方法2022年6月—2023年3月,选取某三级甲等医院的工作人员为研究对象,采用气溶胶凝结核计数法对市面上常见的...目的了解医务人员佩戴医用防护口罩的行为现状,并分析未能规范佩戴医用防护口罩的影响因素,为改进口罩佩戴相关培训提供依据。方法2022年6月—2023年3月,选取某三级甲等医院的工作人员为研究对象,采用气溶胶凝结核计数法对市面上常见的5款医用防护口罩进行实时定量适合性测试,通过测试仪器适合因数的变化、是否需要专业人员辅助调整综合判断医用防护口罩佩戴情况,应用自制的一般资料调查表对参与者进行问卷调查,借助三维(3D)激光扫描技术扫描参与者头面部,将扫描图像导入Geomagic Studio 2013软件测量头面部尺寸。结果共调查222名医务人员,完成991次实时测试,208次3D扫描。其中221次(22.30%)测试参与者未能规范佩戴医用防护口罩,5款医用防护口罩的不规范佩戴比率分别为30.56%、25.62%、25.87%、23.15%、7.35%。佩戴口罩不规范率:不同医用防护口罩形状,参与者职业、上一次医用防护口罩佩戴技能培训时间及是否有呼吸道传染病防治相关工作经验各组比较,差异均有统计学意义(均P<0.05);医用防护口罩品牌、尺寸,以及参与者性别、科室等各组比较,差异无统计学意义(均P>0.05)。折叠状医用防护口罩佩戴规范与不规范者身体质量指数(BMI)比较,差异均有统计学意义(均P<0.05)。结论医务人员佩戴医用防护口罩不规范受诸多因素影响,在正式的定量适合性测试之前推荐进行实时测试,能节省时间,提高测试效率。未来进行医用防护口罩佩戴培训时,对不同形状的口罩应进行针对性的培训,重点关注后勤人员、实习生、BMI高者,以及从未接受医用防护口罩佩戴培训者及未参加过呼吸道传染病防治相关工作者。展开更多
This paper analyzes the operation parameters of the time delay and integration (TDI) line scan CCD camera, such as resolution, line rate, clock frequency, etc. and their mathematical relationship is deduced. By analyz...This paper analyzes the operation parameters of the time delay and integration (TDI) line scan CCD camera, such as resolution, line rate, clock frequency, etc. and their mathematical relationship is deduced. By analyzing and calculating these parameters, the working clocks of the TDI CCD line scan camera are designed, which guarantees the synchronization of the line scan rate and the camera movement speed. The IL-E2 TDI CCD of DALSA Co. is used as the sensor of the camera in the paper. The working clock generator used for the TDI CCD sensor is realized by using the programmable logic device (PLD). The experimental results show that the working clock generator circuit satisfies the requirement of high speed TDI CCD line scan camera.展开更多
目的:探讨科宝 XL 全自动尿液分析仪试剂条放置时间对亚硝酸盐(NIT)检测结果的影响,确保为临床提供准确可靠的实验数据,提高临床的诊断率。方法用新装入试剂仓内的新试剂条分别于<5,30 min;1,2,3.5,4,4.5,5,5.5,6,6.5,...目的:探讨科宝 XL 全自动尿液分析仪试剂条放置时间对亚硝酸盐(NIT)检测结果的影响,确保为临床提供准确可靠的实验数据,提高临床的诊断率。方法用新装入试剂仓内的新试剂条分别于<5,30 min;1,2,3.5,4,4.5,5,5.5,6,6.5,7,8 h 不同时间段内检测16份0.9 g/dl 的生理盐水中 NIT 的假阳性率,并对不同时间段 NIT 假阳性率进行比较分析。结果<3.5 h NIT 假阳性率均为0%(0/16),4~4.5 h 假阳性率为18.8%(3/16),5~5.5 h 假阳性率为43.8%(7/16),6~6.5 h 为62.5%(10/16),7~8 h 为87.5%(14/16);>4 h 以上各时间段 NIT 假阳性率之间比较,差异均有统计学意义(χ2=11.7~59.2,P 均<0.01)。结论科宝 XL 全自动尿液分析仪试剂条放置4 h 后,NIT 假阳性率开始上升,5 h后 NIT 假阳性率明显增高。因此,加强对科宝 XL 全自动尿液分析仪试剂条放置时间合理管理,应以<3.5 h 为宜,这样有利于降低 NIT 假阳性率。展开更多
Aiming at the time redundancy in the fiat panel display (FPD) imaging process, the paper studied some problems for FPD gray scale controlling based on the fraetal theory, dissertates the construction of the space-ti...Aiming at the time redundancy in the fiat panel display (FPD) imaging process, the paper studied some problems for FPD gray scale controlling based on the fraetal theory, dissertates the construction of the space-time mapping topology architecture, the proposition of optimal scanning structure for FPD's gray imaging, and the creation of the fractal theoretic model. Then the logic implementation and system application are presented based on the fraetal model of the optimal scan architecture, and the application results achieved target of eliminating time redundancy and increasing the scanning availability. The novel control mode that the fractal scanning IP core described with Verilog language embedded in the FPGA hardware frame can efficiently increase the imaging gray scales and quality in the FPDs scanning controller and speed up the frame frequency of display system.展开更多
文摘目的:分析Brain Time Stack图像融合技术在CT中的应用。方法:选取2021年3月—2022年9月衡水市第四人民医院收治的50例CT检查患者作为研究对象。所有患者进行CT检查并进行Brain Time Stack后处理。比较四组不同部位CT值、标准差(SD)、信噪比(SNR)。比较四组图像主观质量评分。分析不同部位CT值、SD、SNR与图像主观质量评分的相关性。结果:B组的延髓、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉CT值明显低于A组;C组的延髓、脑室、额叶白质、小脑内侧、小脑外侧、颞肌肌肉CT值高于A组;D组延髓、额叶灰质、颞肌肌肉CT值明显低于A组,脑室、额叶白质、小脑外侧CT值明显高于A组;C组延髓、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉CT值明显高于B组;D组延髓、脑室、额叶白质、小脑内侧、小脑外侧、颞肌肌肉CT值明显高于B组;D组延髓、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉CT值明显低于C组;D组脑室CT值明显高于C组,差异有统计学意义(P<0.05)。B组、C组、D组延髓、脑室、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉SD值明显低于A组;C组延髓、脑室、额叶白质、小脑内侧、小脑外侧、颞肌肌肉SD值均明显高于B组;C组额叶灰质SD明显低于B组;D组延髓、脑室、额叶灰质、额叶白质、小脑内侧、小脑外侧、肌肉SD均明显低于B组、C组,差异有统计学意义(P<0.05)。B组、C组、D组延髓、脑室、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉SNR均明显高于A组;C组、D组延髓、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉SNR值明显高于B组;C组、D组脑室SNR明显低于B组;D组延髓、脑室、额叶灰质、额叶白质、小脑内侧、小脑外侧、颞肌肌肉SNR明显高于C组,差异有统计学意义(P<0.05)。D组图像主观质量评分最高,差异有统计学意义(P<0.05)。延髓、脑室、额叶灰质、额叶白质、小脑内侧、小脑外侧及颞肌肌肉SD与主观质量评分呈明显负相关,SNR与主观质量评分间呈明显正相关,差异有统计学意义(P<0.05)。结论:利用Brain Time Stack图像融合技术对头部CT扫描检查图像处理,动脉期结合前一期及后一期的图像数据在处理后具有更好的质量和更少的噪音。
基金Project supported by the National Natural Science Foundation of China(Grant No.61205101)the Shenzhen Municipal Research Foundation,China(Grant Nos.GJHZ201404171134305 and JCYJ20140417113130693)the Marie Curie Actions-International Research Staff Exchange Scheme(IRSES)(Grant No.FP7 PIRSES-2013-612267)
文摘Spectroscopic measurements and terahertz imaging of the cornea are carried out by using a rapid scanning terahertz time domain spectroscopy(THz-TDS) system.A voice coil motor stage based optical delay line(VCM-ODL) is developed to provide a rather simple and robust structure with both the high scanning speed and the large delay length.The developed system is used for THz spectroscopic measurements and imaging of the corneal tissue with different amounts of water content,and the measurement results show the consistence with the reported results,in which the measurement time using VCM-ODL is a factor of 360 shorter than the traditional motorized optical delay line(MDL).With reducing the water content a monotonic decrease of the complex permittivity of the cornea is observed.The two-term Debye relaxation model is employed to explain our experimental results,revealing that the fast relaxation time of a dehydrated cornea is much larger than that of a hydrated cornea and its dielectric behavior can be affected by the presence of the biological macromolecules.These results demonstrate that our THz spectrometer may be a promising candidate for tissue hydration sensing and practical application of THz technology.
基金supported by the Instrument Developing Project of the Chinese Academy of Sciences (Grant No.YZ200740)the National Natural Science Foundation of China (Grant Nos.60978034 and 10974019)the National High Technology Research and Development Program of China (Grant No.2009AA03Z318)
文摘A laser scanning confocal imaging-surface plasmon resonance (LSCI-SPR) instrument integrated with a wavelength-dependent surface plasmon resonance (SPR) sensor and a laser scanning confocal microscopy (LSCM) is built to detect the bonding process of human IgG and fluorescent-labeled affinity purified antibodies in real time. The shifts of resonant wavelength at different reaction time stages are obtained by SPR, corresponding well with the changes of the fluorescence intensity collected by using LSCM. The instrument shows the merits of the combination and complementation of the SPR and LSCM, with such advantages as quantificational analysis, high spatial resolution and real time monitor, which are of great importance for practical applications in biosensor and life science.
基金the National Basic Research Program of China(No.2003CB716206)the National Natural Science Foundation of China(No.50605025)
文摘In order to optimize the transitional time during the successive exposure scans for a step-and-scanlithography and improve the productivity in a wafer production process,an investigation of the motion tra-jectory planning along the scanning direction for wafer stage was carried out.The motions of wafer stagewere divided into two respective logical moves(i.e.step-move and scan-move)and the multi-motion-overlap algorithms(MMOA)were presented for optimizing the transitional time between the successive ex-posure scans.The conventional motion planning method,the Hazehon method and the MMOA were ana-lyzed theoretically and simulated using MATLAB under four different exposure field sizes.The resultsshow that the total time between two successive scans consumed by MMOA is reduced by 4.82%,2.62%,3.06% and 3.96%,compared with those of the conventional motion planning method;and re-duced by 2.58%,0.76%,1.63% and 2.92%,compared with those of the Hazelton method respec-tively.The theoretical analyses and simulation results illuminate that the MMOA can effectively minimizethe transitional step time between successive exposure scans and therefore increase the wafer fabricatingproductivity.
文摘SLAM的全称为Simultaneous Localization And Mapping即“同时定位与地图构建”。最近几年由于机器人、无人机、自动驾驶、AI、VR和AR技术的发展,SLAM技术逐渐被人们熟知。SLAM技术是通过激光传感器感知周围的环境,并将不同时刻感知的环境进行匹配套合,从而反推本体在环境中的位置及运动轨迹。随着SLAM技术的设备及定位精度的提高,该技术逐渐在测绘行业中使用,迅速成为除RTK和全站仪采点成图之外的一种地形图成图手段。国外GeoSLAM等公司推出大量的产品,在该领域处于领先地位,为打破国外封锁,国内的飞马、数字绿土等公司也研发出相应的产品。该文主要通过具体的案例论述国产手持激光雷达扫描仪飞马SLAM 100在地形测绘中的运用,侧重于表述SLAM技术及SLAM100产品在运用中的优缺点。
文摘目的了解医务人员佩戴医用防护口罩的行为现状,并分析未能规范佩戴医用防护口罩的影响因素,为改进口罩佩戴相关培训提供依据。方法2022年6月—2023年3月,选取某三级甲等医院的工作人员为研究对象,采用气溶胶凝结核计数法对市面上常见的5款医用防护口罩进行实时定量适合性测试,通过测试仪器适合因数的变化、是否需要专业人员辅助调整综合判断医用防护口罩佩戴情况,应用自制的一般资料调查表对参与者进行问卷调查,借助三维(3D)激光扫描技术扫描参与者头面部,将扫描图像导入Geomagic Studio 2013软件测量头面部尺寸。结果共调查222名医务人员,完成991次实时测试,208次3D扫描。其中221次(22.30%)测试参与者未能规范佩戴医用防护口罩,5款医用防护口罩的不规范佩戴比率分别为30.56%、25.62%、25.87%、23.15%、7.35%。佩戴口罩不规范率:不同医用防护口罩形状,参与者职业、上一次医用防护口罩佩戴技能培训时间及是否有呼吸道传染病防治相关工作经验各组比较,差异均有统计学意义(均P<0.05);医用防护口罩品牌、尺寸,以及参与者性别、科室等各组比较,差异无统计学意义(均P>0.05)。折叠状医用防护口罩佩戴规范与不规范者身体质量指数(BMI)比较,差异均有统计学意义(均P<0.05)。结论医务人员佩戴医用防护口罩不规范受诸多因素影响,在正式的定量适合性测试之前推荐进行实时测试,能节省时间,提高测试效率。未来进行医用防护口罩佩戴培训时,对不同形状的口罩应进行针对性的培训,重点关注后勤人员、实习生、BMI高者,以及从未接受医用防护口罩佩戴培训者及未参加过呼吸道传染病防治相关工作者。
基金Sponsored by the Research Fund of Harbin Institute of Technology (Grant No.HITMD 2001.18).
文摘This paper analyzes the operation parameters of the time delay and integration (TDI) line scan CCD camera, such as resolution, line rate, clock frequency, etc. and their mathematical relationship is deduced. By analyzing and calculating these parameters, the working clocks of the TDI CCD line scan camera are designed, which guarantees the synchronization of the line scan rate and the camera movement speed. The IL-E2 TDI CCD of DALSA Co. is used as the sensor of the camera in the paper. The working clock generator used for the TDI CCD sensor is realized by using the programmable logic device (PLD). The experimental results show that the working clock generator circuit satisfies the requirement of high speed TDI CCD line scan camera.
文摘目的:探讨科宝 XL 全自动尿液分析仪试剂条放置时间对亚硝酸盐(NIT)检测结果的影响,确保为临床提供准确可靠的实验数据,提高临床的诊断率。方法用新装入试剂仓内的新试剂条分别于<5,30 min;1,2,3.5,4,4.5,5,5.5,6,6.5,7,8 h 不同时间段内检测16份0.9 g/dl 的生理盐水中 NIT 的假阳性率,并对不同时间段 NIT 假阳性率进行比较分析。结果<3.5 h NIT 假阳性率均为0%(0/16),4~4.5 h 假阳性率为18.8%(3/16),5~5.5 h 假阳性率为43.8%(7/16),6~6.5 h 为62.5%(10/16),7~8 h 为87.5%(14/16);>4 h 以上各时间段 NIT 假阳性率之间比较,差异均有统计学意义(χ2=11.7~59.2,P 均<0.01)。结论科宝 XL 全自动尿液分析仪试剂条放置4 h 后,NIT 假阳性率开始上升,5 h后 NIT 假阳性率明显增高。因此,加强对科宝 XL 全自动尿液分析仪试剂条放置时间合理管理,应以<3.5 h 为宜,这样有利于降低 NIT 假阳性率。
基金supported by the Key Laboratory of Advanced Display and System Applications(Shanghai University),Ministry of Education,China(Grant No.P200803)the Science and Technology Commission of Shanghai Municipality(Grant No.09ZR1412000)
文摘Aiming at the time redundancy in the fiat panel display (FPD) imaging process, the paper studied some problems for FPD gray scale controlling based on the fraetal theory, dissertates the construction of the space-time mapping topology architecture, the proposition of optimal scanning structure for FPD's gray imaging, and the creation of the fractal theoretic model. Then the logic implementation and system application are presented based on the fraetal model of the optimal scan architecture, and the application results achieved target of eliminating time redundancy and increasing the scanning availability. The novel control mode that the fractal scanning IP core described with Verilog language embedded in the FPGA hardware frame can efficiently increase the imaging gray scales and quality in the FPDs scanning controller and speed up the frame frequency of display system.