在超声衍射时差法(time of flight diffraction, TOFD)B扫描图像中,缺陷端部衍射波影像呈类抛物线形态,类抛物线的顶点在图像中的位置代表了缺陷端部在焊缝横截面中的位置.当被检测焊缝存在焊缝余高时,跨越焊缝的B扫描无法实施,因此不...在超声衍射时差法(time of flight diffraction, TOFD)B扫描图像中,缺陷端部衍射波影像呈类抛物线形态,类抛物线的顶点在图像中的位置代表了缺陷端部在焊缝横截面中的位置.当被检测焊缝存在焊缝余高时,跨越焊缝的B扫描无法实施,因此不能对缺陷进行准确定位,针对这一问题,提出一种基于超声TOFD法B扫描图像预测的缺陷端部定位方法,根据B扫描路径上超声探头与缺陷端部的动态位置关系,建立缺陷类抛物线影像的预测模型;通过采集B扫描路径上的两列A信号,利用模型,对缺陷端部类抛物线顶点坐标进行计算,并获得缺陷端部在焊缝横截面中的位置信息.利用文中所提方法,对人工缺陷及焊接缺陷进行定位测量.结果表明,所提方法利用两列A信号,可以有效克服焊缝余高限定检测可达性所带来的技术弊端,并获取缺陷端部在焊缝截面中的位置信息.展开更多
AIM: To evaluate the diagnostic value of B-scan ultrasound and explore the cytological characteristics of patients with vitreoretinal lymphoma(VRL) and primary central nervous system lymphoma(PCNSL).METHODS: The clini...AIM: To evaluate the diagnostic value of B-scan ultrasound and explore the cytological characteristics of patients with vitreoretinal lymphoma(VRL) and primary central nervous system lymphoma(PCNSL).METHODS: The clinical data and pathologic specimens from patients with VRL diagnosed at the North Huashan Hospital from 2016 to 2017 were retrospectively reviewed. The patients were diagnosed by slit lamp ophthalmoscopy, B-scan ultrasound, cytology of the vitreous, which was obtained by vitrectomy, and cytokine measurements of interleukin(IL)-10 and IL-6.RESULTS: Twenty-six eyes(19.4%) out of 134 eyes of 67 patients(47 men and 20 women) with PCNSL were diagnosed with VRL by B-scan ultrasound, and 14 eyes(10.4%) were diagnosed by slit lamp ophthalmoscopy. Twenty-four eyes(17.9%) of 17 patients were confirmed as having VRL with cytology. No difference in the association between intracranial lesion location and ocular involvement was found. VRL patients had higher levels of vitreous IL-10 and IL-10/IL-6 when compared with macular hole cases, but the difference was not statistically significant.CONCLUSION: A total of 25.4% of the PCNSL patients had VRL, B-scan ultrasound examination had characteristic features and is recommended over slit lamp ophthalmoscopy for the screening diagnosis of PCNSL with intraocular involvement. Moreover, the cytological and immunohistochemical analyses performed after 25-gauge diagnostic vitrectomy were accurate diagnostic techniques.展开更多
·AIM: To evaluate the accuracy of 20 MHz immersion Bscan ultrasonography in observing lens and to investigate the value of this noninvasive preoperative diagnosis method in alkali burn eyes.·METHODS: It was ...·AIM: To evaluate the accuracy of 20 MHz immersion Bscan ultrasonography in observing lens and to investigate the value of this noninvasive preoperative diagnosis method in alkali burn eyes.·METHODS: It was a comparative study. Fifty-six cases(56 eyes) of alkali burn eyes were examined by ultrasound biomicroscopy(UBM) and immersion 20 MHz B-scan ultrasonography from June 2011 to April 2013,the images were analyzed, and the ultrasonographic diagnosis compared with the operation results.·RESULTS: In 56 alkali burn eyes examined by UBM, the lens were not detected in 16 eyes; the IOL could be detected in 2 eyes; the anterior lens capsule surface or/and the front lens could be detected in 18 eyes, and lens opacification in 3 eyes of them; suspected abnormal lens were detected in the other 20 eyes. In all the same eyes examined by immersion 20 MHz B-scan ultrasonography,the lens were not detected in 16 eyes; the IOL could be detected in 2 eyes; 24 abnormal lens(opacity, lens expansion, shrinkage) and 14 normal lens were found.Compared with the intraoperative findings, the diagnostic accordance rate of the immersion 20 MHz B-scan appearance of lens was 100%(56/56), which was significantly higher than examined by UBM 57.14%(32/56)(χ2=30.55, P =0.0000).·CONCLUSION: Immersion 20 MHz B-scan ultrasonography can observe the lens accurately in alkali burn eyes. It has important clinical value to combine with UBM in eyes of alkali burn.展开更多
文摘在超声衍射时差法(time of flight diffraction, TOFD)B扫描图像中,缺陷端部衍射波影像呈类抛物线形态,类抛物线的顶点在图像中的位置代表了缺陷端部在焊缝横截面中的位置.当被检测焊缝存在焊缝余高时,跨越焊缝的B扫描无法实施,因此不能对缺陷进行准确定位,针对这一问题,提出一种基于超声TOFD法B扫描图像预测的缺陷端部定位方法,根据B扫描路径上超声探头与缺陷端部的动态位置关系,建立缺陷类抛物线影像的预测模型;通过采集B扫描路径上的两列A信号,利用模型,对缺陷端部类抛物线顶点坐标进行计算,并获得缺陷端部在焊缝横截面中的位置信息.利用文中所提方法,对人工缺陷及焊接缺陷进行定位测量.结果表明,所提方法利用两列A信号,可以有效克服焊缝余高限定检测可达性所带来的技术弊端,并获取缺陷端部在焊缝截面中的位置信息.
基金Supported by the National Natural Science Foundation of China(No.81700123)the Shanghai Hospital Development Centre(No.16CR2043B)
文摘AIM: To evaluate the diagnostic value of B-scan ultrasound and explore the cytological characteristics of patients with vitreoretinal lymphoma(VRL) and primary central nervous system lymphoma(PCNSL).METHODS: The clinical data and pathologic specimens from patients with VRL diagnosed at the North Huashan Hospital from 2016 to 2017 were retrospectively reviewed. The patients were diagnosed by slit lamp ophthalmoscopy, B-scan ultrasound, cytology of the vitreous, which was obtained by vitrectomy, and cytokine measurements of interleukin(IL)-10 and IL-6.RESULTS: Twenty-six eyes(19.4%) out of 134 eyes of 67 patients(47 men and 20 women) with PCNSL were diagnosed with VRL by B-scan ultrasound, and 14 eyes(10.4%) were diagnosed by slit lamp ophthalmoscopy. Twenty-four eyes(17.9%) of 17 patients were confirmed as having VRL with cytology. No difference in the association between intracranial lesion location and ocular involvement was found. VRL patients had higher levels of vitreous IL-10 and IL-10/IL-6 when compared with macular hole cases, but the difference was not statistically significant.CONCLUSION: A total of 25.4% of the PCNSL patients had VRL, B-scan ultrasound examination had characteristic features and is recommended over slit lamp ophthalmoscopy for the screening diagnosis of PCNSL with intraocular involvement. Moreover, the cytological and immunohistochemical analyses performed after 25-gauge diagnostic vitrectomy were accurate diagnostic techniques.
基金Supported by National Key Basic Research Program of China(973 Program,No.2013CB967001)National Natural Science Foundation of China(No.81271052,No.31271059)
文摘·AIM: To evaluate the accuracy of 20 MHz immersion Bscan ultrasonography in observing lens and to investigate the value of this noninvasive preoperative diagnosis method in alkali burn eyes.·METHODS: It was a comparative study. Fifty-six cases(56 eyes) of alkali burn eyes were examined by ultrasound biomicroscopy(UBM) and immersion 20 MHz B-scan ultrasonography from June 2011 to April 2013,the images were analyzed, and the ultrasonographic diagnosis compared with the operation results.·RESULTS: In 56 alkali burn eyes examined by UBM, the lens were not detected in 16 eyes; the IOL could be detected in 2 eyes; the anterior lens capsule surface or/and the front lens could be detected in 18 eyes, and lens opacification in 3 eyes of them; suspected abnormal lens were detected in the other 20 eyes. In all the same eyes examined by immersion 20 MHz B-scan ultrasonography,the lens were not detected in 16 eyes; the IOL could be detected in 2 eyes; 24 abnormal lens(opacity, lens expansion, shrinkage) and 14 normal lens were found.Compared with the intraoperative findings, the diagnostic accordance rate of the immersion 20 MHz B-scan appearance of lens was 100%(56/56), which was significantly higher than examined by UBM 57.14%(32/56)(χ2=30.55, P =0.0000).·CONCLUSION: Immersion 20 MHz B-scan ultrasonography can observe the lens accurately in alkali burn eyes. It has important clinical value to combine with UBM in eyes of alkali burn.
