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一种基于SSED的无规则噪声组织的去除方法
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作者 张硕 袁克虹 《中国医学物理学杂志》 CSCD 2015年第1期48-50,56,共4页
目的:在医学图像处理领域,往往会由于方案设计、算法选取等原因而产生大量的不规则的噪声组织。本文通过研究分析噪声组织形态特征,提出了一种新的快速去除噪声组织的方法,为医学图像处理的噪声组织去除领域提供一种全新的思路。方法:... 目的:在医学图像处理领域,往往会由于方案设计、算法选取等原因而产生大量的不规则的噪声组织。本文通过研究分析噪声组织形态特征,提出了一种新的快速去除噪声组织的方法,为医学图像处理的噪声组织去除领域提供一种全新的思路。方法:本文首次将距离映射应用到噪声组织去除领域,利用有符号串行欧氏距离映射(Signed Sequence Euclidean Distance Mapping,简称SSED)对图像进行距离映射计算,通过对距离映射图像进行适当的阈值化处理,实现了快速识别、去除各种不规则的噪声组织,与此同时确保了感兴趣目标区域的完整。结果:本方法已通过对12组临床心脏CT序列的实际测试,快速准确的去除了图像中存在的各种不规则的噪声组织,同时实现了对感兴趣目标区域的平滑。结论:该方法去除精度高、去除效率优于现有的形态学和骨架提取等各类方法,为临床医生的诊断提供了清晰且精确的辅助,大大提高了无规则噪声组织去除的效率和鲁棒性。 展开更多
关键词 噪声组织 SSED 形态学 医学图像
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用极性阈值法降低铸钢超声探伤组织噪声的研究 被引量:1
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作者 左建国 《湖南冶金》 1997年第5期1-4,共4页
采用超声波对铸钢件进行无损探伤时将产生较强的组织散射噪声,这对正确评价探测对象的质量十分不利。该项研究采用分离频谱法对探伤信号进行处理,再用极性阈值法作恢复运算,来达到降低组织噪声的目的.以水平连铸圆管坯为研究对象的... 采用超声波对铸钢件进行无损探伤时将产生较强的组织散射噪声,这对正确评价探测对象的质量十分不利。该项研究采用分离频谱法对探伤信号进行处理,再用极性阈值法作恢复运算,来达到降低组织噪声的目的.以水平连铸圆管坯为研究对象的实验结果表明.研究采用的方法对组织噪声有较好的抑制作用. 展开更多
关键词 超声探伤 组织噪声 分离频谱法 极性阈值法
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TC4钛合金板材双晶探头超声波检测 被引量:5
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作者 张永红 李永春 曹凯 《宇航材料工艺》 CAS CSCD 北大核心 2012年第5期72-75,共4页
研究了TC4钛合金板材高灵敏度双晶探头超声波检测中变型波、组织噪声的产生原因及影响。结果表明:变型波会给缺陷波定量评定带来影响,以缺陷波始脉冲波幅定量评定最为准确,对于缺陷波始脉冲之后的波幅超标应选用不同焦距的双晶探头进行... 研究了TC4钛合金板材高灵敏度双晶探头超声波检测中变型波、组织噪声的产生原因及影响。结果表明:变型波会给缺陷波定量评定带来影响,以缺陷波始脉冲波幅定量评定最为准确,对于缺陷波始脉冲之后的波幅超标应选用不同焦距的双晶探头进行对比检测。组织噪声的产生与板材中同取向粗大α相晶粒增多密切相关,通过减小脉冲宽度可有效降低组织噪声。 展开更多
关键词 钛合金板材 双晶探头 变型波 组织噪声
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Expression of 6 MicroRNAs in Prostate Cancer and Its Significance 被引量:2
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作者 Ming Li Liyu Cao +2 位作者 Hongfu Zhang Yu Yin Xiaochun Xu 《Chinese Journal of Clinical Oncology》 CSCD 2009年第1期21-28,共8页
OBJECTIVE Numerous microRNAs (miRNAs) are deregulatedin human cancers. The experimental evidence supports thatmiRNAs plays a role in the initiation and progression of humanmalignancies.The present study was undertaken... OBJECTIVE Numerous microRNAs (miRNAs) are deregulatedin human cancers. The experimental evidence supports thatmiRNAs plays a role in the initiation and progression of humanmalignancies.The present study was undertaken to evaluatethe differential expression of 6 miRNAs as biomarker for earlydetection of prostate cancer, and then to determine whether theexpression profiling of these miRNAs could predict the prognosisof prostate cancer.METHODS The expression profilings of these 6 miRNAs wereinvestigated using the method of locked nucleic acid (LNA)-modified oligonucleotide in situ hybridization (ISH). And thetechnology of tissue microarray (TMA) was employed using theformalin-fixed, paraffin-embedd (FFPE) specimens taken from52 patients with prostate carcinoma (PCa) and 38 patients withbenign prostatic hyperplasia (BPH).RESULTS The rates of positive expression for 6 miRNAs (miR-15b, miR-16, let-7g, miR- 96,miR-182 and miR-183) were 26.92%,15.38%, 15.38%, 67.31%, 61.54% and 71.15% in the specimens ofprostate cancer, and 57.89%, 76.32%, 68.42%, 44.74%, 31.58%,47.37% in the tissues of benign prostatic hyperplasia, respectively.The expressions of all 6 miRNAs between the prostate cancer andbenign prostatic hyperplasia tissues were significantly different(P < 0.05). The positive rate of these 6 miRNAs was significantlyrelated to the Gleason Grading of prostate cancer (P < 0.01). Therewas no significant correlation between the expression of thesemiRNAs and age and the concentration of serum PSA of thepatient (P >0.05). We also found that the expression of miR-15b,miR-96 and miR-182 correlated with clinical stages of tumor (P <0.05). The expression of miR-96 correlated with lobus prostatae oftumor invasion (P < 0.01), but the expressions of the remaining fivemiRNAs were not correlated with that (P >0.05). In addition, theexpression of miR-15b was negatively related to that of miR-96,miR-182 and miR-183, respectively (P < 0.01, r < 0.00).There wasa positive correlation among the expressions of miR-96, miR-182and miR-183 in prostate cancer (P < 0.01, r >0.00). The expressionof miR-16 was positively related to that of miR-let-7g (P < 0.01, r >0.00).CONCLUSION The results suggest that miRNA expressionprofiling could have relevance to the biological and clinicalbehavior of prostate cancer,and they might be importantbiomarkers for early detection and prognostic assessment ofprostate cancer. 展开更多
关键词 MICRORNA prostate cancer benign prostatic hyperplasia tissue microarray in situ hybridization.
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Effects of white noise on procedural pain-related cortical response and pain score in neonates:A randomized controlled trial 被引量:6
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作者 Xuyan Ren Li Li +2 位作者 Siya Lin Chunxia Zhong Bin Wang 《International Journal of Nursing Sciences》 CSCD 2022年第3期269-277,I0001,共10页
Objectives To evaluate the effects of white noise on pain-related cortical response,pain score,and behavioral and physiological parameters in neonates with procedural pain.Methods A double-blind,randomized controlled ... Objectives To evaluate the effects of white noise on pain-related cortical response,pain score,and behavioral and physiological parameters in neonates with procedural pain.Methods A double-blind,randomized controlled trial was conducted.Sixty-six neonates from the Neonatal Intensive Care Unit in a university-affiliated general hospital were randomly assigned to listen to white noise at 50 dB(experimental group)or 0 dB(control group)2 min before radial artery blood sampling and continued until 5 min after needle withdrawal.Pain-related cortical response was measured by regional cerebral oxygen saturation(rScO_(2))monitored with near-infrared spectroscopy,and facial expressions and physiological parameters were recorded by two video cameras.Two assessors scored the Premature Infant Pain Profile-Revised(PIPP-R)independently when viewing the videos.Primary outcomes were pain score and rScO_(2)during arterial puncture and 5 min after needle withdrawal.Secondary outcomes were pulse oximetric oxygen saturation(SpO_(2))and heart rate(HR)during arterial puncture,and duration of painful expressions.The study was registered at the Chinese Clinical Trial Registry(ChiCTR2200055571).Results Sixty neonates(experimental group,n=29;control group,n=31)were included in the final analysis.The maximum PIPP-R score in the experimental and control groups was 12.00(9.50,13.00),12.50(10.50,13.75),respectively(median difference−0.5,95%CI−2.0 to 0.5),and minimum rScO_(2)was(61.22±3.07)%,(61.32±2.79)%,respectively(mean difference−0.325,95%CI−1.382 to 0.732),without significant differences.During arterial puncture,the mean rScO_(2),HR,and SpO_(2)did not differ between groups.After needle withdrawal,the trends for rScO_(2),PIPP-R score,and facial expression returning to baseline were different between the two groups without statistical significance.Conclusion The white noise intervention did not show beneficial effects on pain-related cortical response as well as pain score,behavioral and physiological parameters in neonates with procedural pain. 展开更多
关键词 Facial expression Intensive care units NEONATES Procedural pain Premature infant pain profile-revised Radial artery Regional cerebral oxygen saturation White noise
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