Objective:To explore the effect of TCD foaming test in screening patent foramen ovale in migraine patients,as well as in the treatment effect.Methods:From September 2019 to August 2020,236 patients with migraine and 3...Objective:To explore the effect of TCD foaming test in screening patent foramen ovale in migraine patients,as well as in the treatment effect.Methods:From September 2019 to August 2020,236 patients with migraine and 362 patients with normal physical examination were treated in our hospital.According to the random number table method,60 patients with migraine were selected as the observation group,and 60 patients with normal physical examination were selected as the control group.48 cases of PFO were confirmed by TCD foaming test Among the patients with migraine,36 patients received interventional occlusion therapy.The therapeutic effect and VAS score of the two groups were analyzed.Results:Through TCD foaming test,the proportion of PFO in the observation group was 80%,and that in the control group was 13.33%.The proportion of PFO in the observation group was significantly higher than that in the control group,and the difference was statistically significant(χ^(2)=53.5714,P<0.01);The symptoms disappeared in 30 patients and improved in 4 patients;Among the 36 patients who received interventional occlusion therapy,the VAS score of patients before and after the operation was significantly changed,and the proportion of patients whose pain disappeared after the operation was 83.33%,which was significantly lower than that before the operation,and the difference was comparable(χ^(2)=51.4286,P<0.01).Conclusion:TCD foaming test for PFO screening has strong applicability,not only safe and convenient,will not cause trauma to patients,and through interventional occlusion treatment,can significantly improve the clinical symptoms of migraine patients and cure patients.展开更多
Ultrasonic baths and sonochemical reactors are widely used in industrial applications dealing with surface cleaningand chemical synthesis. The processes of erosion, cleaning and structuring of the surface can be typic...Ultrasonic baths and sonochemical reactors are widely used in industrial applications dealing with surface cleaningand chemical synthesis. The processes of erosion, cleaning and structuring of the surface can be typically controlledby changing relevant influential parameters. In particular, in this work, we experimentally investigate theeffect of NaCl concentration (0–5.5 mol/L) on the erosion of an aluminum foil under ultrasonic exposure at afrequency of 28 kHz. Special attention is paid to the determination of cavitation zones and their visualizationusing heat maps. It is found that at low NaCl concentration (0.3 mol/L), the foil destruction rate is higher thanin distilled water. At higher concentrations of salt, cavitation takes place mainly in the upper part of the container.展开更多
Liver disease accounts for approximately 2 million deaths per year worldwide.All chronic liver diseases(CLDs),whether of toxic,genetic,autoimmune,or infectious origin,undergo typical histological changes in the struct...Liver disease accounts for approximately 2 million deaths per year worldwide.All chronic liver diseases(CLDs),whether of toxic,genetic,autoimmune,or infectious origin,undergo typical histological changes in the structure of the tissue.These changes may include the accumulation of extracellular matrix material,fats,triglycerides,or tissue scarring.Noninvasive methods for diagnosing CLD,such as conventional B-mode ultrasound(US),play a significant role in diagnosis.Doppler US,when coupled with B-mode US,can be helpful in evaluating the hemodynamics of hepatic vessels and detecting US findings associated with hepatic decompensation.US elastography can assess liver stiffness,serving as a surrogate marker for liver fibrosis.It is important to note that interpreting these values should not rely solely on a histological classification.Contrast-enhanced US(CEUS)provides valuable information on tissue perfusion and enables excellent differentiation between benign and malignant focal liver lesions.Clinical evaluation,the etiology of liver disease,and the patient current comorbidities all influence the interpretation of liver stiffness measurements.These measurements are most clinically relevant when interpreted as a probability of compensated advanced CLD.B-mode US offers a subjective estimation of fatty infiltration and has limited sensitivity for mild steatosis.The controlled attenuation parameter requires a dedicated device,and cutoff values are not clearly defined.Quan-titative US parameters for liver fat estimation include the attenuation coefficient,backscatter coefficient,and speed of sound.These parameters offer the advantage of providing fat quantification alongside B-mode evaluation and other US parameters.Multiparametric US(MPUS)of the liver introduces a new concept for complete noninvasive diagnosis.It encourages examiners to utilize the latest features of an US machine,including conventional B-mode,liver stiffness evaluation,fat quantification,dispersion imaging,Doppler US,and CEUS for focal liver lesion characterization.This comprehensive approach allows for diagnosis in a single examination,providing clinicians worldwide with a broader perspective and becoming a cornerstone in their diagnostic arsenal.MPUS,in the hands of skilled clinicians,becomes an invaluable predictive tool for diagnosing,staging,and monitoring CLD.展开更多
Purpose : To compare the clinical application value of Ultrasound biomicrsocpic dark room provocative test with the traditional dark room test in screening primary angle closure glaucoma (PACG).Methods: 22 eyes with P...Purpose : To compare the clinical application value of Ultrasound biomicrsocpic dark room provocative test with the traditional dark room test in screening primary angle closure glaucoma (PACG).Methods: 22 eyes with PACG in prodromal stage and 30 eyes with deep anterior chamber and wide angle of 15 normal persons were observed in this trail. All 52 eyes were performed traditional dark room provocative test and ultrasound biomicorosopic darkroom test respectively. With different positive diagnostic criteria, the sensitivity of the two methods were compared using chi-squared analysis.Results : After staying in the dark room for 2 hours, In case group, IOP in 10 of 22 eyes rose more than 1. 07kPa(1kPa = 7.5mmHg), in 12 eyes less than 1.07kPa or had no changes; appositional angle closure were found by Goldmann gonioscopy in 8 eyes : 3 eyes in two quadrants, 5 eyes in more than two quadrants; the appositional angle closure was found by UBM in 15 eyes; 3 eyes in one quadrants, 5 eyes in two quadrants, 7展开更多
锚拉板广泛用于钢箱梁斜拉桥中,但锚拉板与锚管连接的倒圆角处存在应力集中,在动力荷载作用下容易发生疲劳破坏.以大连某斜拉桥为工程背景,对其锚拉板疲劳性能展开理论分析与试验研究.首先通过临界距离理论(theory of critical distance...锚拉板广泛用于钢箱梁斜拉桥中,但锚拉板与锚管连接的倒圆角处存在应力集中,在动力荷载作用下容易发生疲劳破坏.以大连某斜拉桥为工程背景,对其锚拉板疲劳性能展开理论分析与试验研究.首先通过临界距离理论(theory of critical distance,TCD)对锚拉板的疲劳性能进行理论分析,通过"线法"得到锚拉板等效应力为141MPa.然后进行疲劳试验,试验模型比例为1∶1.5.由试验测得锚拉板的最大等效应力32 MPa,最大变形3mm,锚拉板在施加荷载过程中处于弹性工作状态.在200万次的疲劳加载后未发现裂纹.理论分析和疲劳试验结果表明,该斜拉桥锚拉板式索梁锚固结构在设计寿命期内,不会发生疲劳开裂.展开更多
文摘Objective:To explore the effect of TCD foaming test in screening patent foramen ovale in migraine patients,as well as in the treatment effect.Methods:From September 2019 to August 2020,236 patients with migraine and 362 patients with normal physical examination were treated in our hospital.According to the random number table method,60 patients with migraine were selected as the observation group,and 60 patients with normal physical examination were selected as the control group.48 cases of PFO were confirmed by TCD foaming test Among the patients with migraine,36 patients received interventional occlusion therapy.The therapeutic effect and VAS score of the two groups were analyzed.Results:Through TCD foaming test,the proportion of PFO in the observation group was 80%,and that in the control group was 13.33%.The proportion of PFO in the observation group was significantly higher than that in the control group,and the difference was statistically significant(χ^(2)=53.5714,P<0.01);The symptoms disappeared in 30 patients and improved in 4 patients;Among the 36 patients who received interventional occlusion therapy,the VAS score of patients before and after the operation was significantly changed,and the proportion of patients whose pain disappeared after the operation was 83.33%,which was significantly lower than that before the operation,and the difference was comparable(χ^(2)=51.4286,P<0.01).Conclusion:TCD foaming test for PFO screening has strong applicability,not only safe and convenient,will not cause trauma to patients,and through interventional occlusion treatment,can significantly improve the clinical symptoms of migraine patients and cure patients.
文摘Ultrasonic baths and sonochemical reactors are widely used in industrial applications dealing with surface cleaningand chemical synthesis. The processes of erosion, cleaning and structuring of the surface can be typically controlledby changing relevant influential parameters. In particular, in this work, we experimentally investigate theeffect of NaCl concentration (0–5.5 mol/L) on the erosion of an aluminum foil under ultrasonic exposure at afrequency of 28 kHz. Special attention is paid to the determination of cavitation zones and their visualizationusing heat maps. It is found that at low NaCl concentration (0.3 mol/L), the foil destruction rate is higher thanin distilled water. At higher concentrations of salt, cavitation takes place mainly in the upper part of the container.
文摘Liver disease accounts for approximately 2 million deaths per year worldwide.All chronic liver diseases(CLDs),whether of toxic,genetic,autoimmune,or infectious origin,undergo typical histological changes in the structure of the tissue.These changes may include the accumulation of extracellular matrix material,fats,triglycerides,or tissue scarring.Noninvasive methods for diagnosing CLD,such as conventional B-mode ultrasound(US),play a significant role in diagnosis.Doppler US,when coupled with B-mode US,can be helpful in evaluating the hemodynamics of hepatic vessels and detecting US findings associated with hepatic decompensation.US elastography can assess liver stiffness,serving as a surrogate marker for liver fibrosis.It is important to note that interpreting these values should not rely solely on a histological classification.Contrast-enhanced US(CEUS)provides valuable information on tissue perfusion and enables excellent differentiation between benign and malignant focal liver lesions.Clinical evaluation,the etiology of liver disease,and the patient current comorbidities all influence the interpretation of liver stiffness measurements.These measurements are most clinically relevant when interpreted as a probability of compensated advanced CLD.B-mode US offers a subjective estimation of fatty infiltration and has limited sensitivity for mild steatosis.The controlled attenuation parameter requires a dedicated device,and cutoff values are not clearly defined.Quan-titative US parameters for liver fat estimation include the attenuation coefficient,backscatter coefficient,and speed of sound.These parameters offer the advantage of providing fat quantification alongside B-mode evaluation and other US parameters.Multiparametric US(MPUS)of the liver introduces a new concept for complete noninvasive diagnosis.It encourages examiners to utilize the latest features of an US machine,including conventional B-mode,liver stiffness evaluation,fat quantification,dispersion imaging,Doppler US,and CEUS for focal liver lesion characterization.This comprehensive approach allows for diagnosis in a single examination,providing clinicians worldwide with a broader perspective and becoming a cornerstone in their diagnostic arsenal.MPUS,in the hands of skilled clinicians,becomes an invaluable predictive tool for diagnosing,staging,and monitoring CLD.
文摘Purpose : To compare the clinical application value of Ultrasound biomicrsocpic dark room provocative test with the traditional dark room test in screening primary angle closure glaucoma (PACG).Methods: 22 eyes with PACG in prodromal stage and 30 eyes with deep anterior chamber and wide angle of 15 normal persons were observed in this trail. All 52 eyes were performed traditional dark room provocative test and ultrasound biomicorosopic darkroom test respectively. With different positive diagnostic criteria, the sensitivity of the two methods were compared using chi-squared analysis.Results : After staying in the dark room for 2 hours, In case group, IOP in 10 of 22 eyes rose more than 1. 07kPa(1kPa = 7.5mmHg), in 12 eyes less than 1.07kPa or had no changes; appositional angle closure were found by Goldmann gonioscopy in 8 eyes : 3 eyes in two quadrants, 5 eyes in more than two quadrants; the appositional angle closure was found by UBM in 15 eyes; 3 eyes in one quadrants, 5 eyes in two quadrants, 7
文摘锚拉板广泛用于钢箱梁斜拉桥中,但锚拉板与锚管连接的倒圆角处存在应力集中,在动力荷载作用下容易发生疲劳破坏.以大连某斜拉桥为工程背景,对其锚拉板疲劳性能展开理论分析与试验研究.首先通过临界距离理论(theory of critical distance,TCD)对锚拉板的疲劳性能进行理论分析,通过"线法"得到锚拉板等效应力为141MPa.然后进行疲劳试验,试验模型比例为1∶1.5.由试验测得锚拉板的最大等效应力32 MPa,最大变形3mm,锚拉板在施加荷载过程中处于弹性工作状态.在200万次的疲劳加载后未发现裂纹.理论分析和疲劳试验结果表明,该斜拉桥锚拉板式索梁锚固结构在设计寿命期内,不会发生疲劳开裂.
