This paper investigates Buck＇s question about which class of spaces is strongly monotonically T2,and if other properties are combined with strongly monotonically T2,which class of spaces could be got. Based on having...This paper investigates Buck＇s question about which class of spaces is strongly monotonically T2,and if other properties are combined with strongly monotonically T2,which class of spaces could be got. Based on having a cushioned pair-base space and compact strongly monotonically T2 space,some results （Theorems 1--3） are obtained.展开更多
Objective Io evaluate changes in morphology of the cesarean scar and uterus between one and two years after cesarean section using high-resolution,three dimensional T2-weighted sampling perfection with application opt...Objective Io evaluate changes in morphology of the cesarean scar and uterus between one and two years after cesarean section using high-resolution,three dimensional T2-weighted sampling perfection with application optimized contrast using diflerent flip angle evolutions Magnetic Resonance Imaging(3DT2w SPACE MRI).Methods This prospective study was performed to investigate morphological changes in the cesarean scars and uterus from one to two years after cesarean section using high-resolution,3D T2w SPACE MRI.The healthy volunteers having no childbearing history were recruited as the controls.All data were measured by two experienced radiologists.All data with normal distribution between the one-year and two-year groups were compared using a paired-sample t test or independent t test.Results Finally,46 women took a pelvic MR examination one year after cesarean section,and a subset of 15 completed the same examination again after two years of cesarean section.Both the uterine length and the anterior wall thickness after two years of cesarean section(5.75±0.46 and 1.45±0.35 cm)were significantly greater than those measured at one year(5.33±0.59 and 1.25±0.27 cm)(t=-2.363 and-2.175,P=0.033 and 0.048).No significant difference was shown in myometrial thickness two years after cesarean section(1.45±0.35 cm)with respect to the control group(1.58±0.21 cm,P=0.170).Nine women who underwent MRI twice were considered to have scar diverticula one year after cesarean section,and still had diverticula two years after cesarean section.The thickness,height,and width of the uterine scar showed no significant change from one to two years(all P>0.05).Conclusions 3D T2w SPACE MRI provides overall morphologic details and shows dynamic changes in the scar and the uterus between one and two years after cesarean section.Scar morphology after cesarean section reached relatively stable one year after cesarean section,and uterine morphology was closer to normal two years after cesarean section.展开更多
目的研究T2加权脂肪抑制序列(T2-weighted imaging fat suppression,T2WI-FS)影像组学诊断宫颈癌(cervical cancer,CC)淋巴转移及脉管间隙浸润(lymph vascular space invasion,LVSI)的价值。材料与方法回顾性分析2017年6月至2020年6月...目的研究T2加权脂肪抑制序列(T2-weighted imaging fat suppression,T2WI-FS)影像组学诊断宫颈癌(cervical cancer,CC)淋巴转移及脉管间隙浸润(lymph vascular space invasion,LVSI)的价值。材料与方法回顾性分析2017年6月至2020年6月间66例CC患者临床资料及术前磁共振成像横轴位T2WI-FS图像,勾画病灶感兴趣区域(region of interest,ROI),将患者预处理图像与ROI图像依次导入A.K.软件,提取T2WI-FS图像上病灶组学特征,经特征降维处理后,建立逻辑回归模型影像组学标签,绘制受试者工作特征(receiver operating characteristic,ROC)曲线,分析T2WI-FS组学标签在诊断CC淋巴转移及LVSI中的价值。结果病理检查结果提示存在淋巴转移者共22例,无转移者44例,分析发现,淋巴转移与患者宫颈间质浸润深度及LVSI有关(P值均<0.01);LVSI阳性患者共27例,阴性患者39例,分析发现,LVSI与患者组织分化程度、宫颈间质浸润深度及淋巴结转移有关(P值均<0.01);T2WI-FS影像组学标签评估患者淋巴转移的曲线下面积(area under the area under the curve,AUC)=0.857,诊断敏感度(sensitivity,Sen)=85.0%,特异度(specificity,Spe)=86.7%,评估患者LVSI的AUC=0.807,诊断Sen=68.3%,Spe=88.3%。结论淋巴结转移及LVSI间相互影响,两者均受到宫颈间质浸润深度的影响,T2WI-FS影像组学标签在评估患者淋巴转移及LVSI中均具有较高的效能,在宫颈癌患者术前病情评估,指导手术治疗方案及预后预测中均具有较高的应用价值。展开更多
目的评价MRI 3D T2-SPACE诊断大脑中动脉及基底动脉狭窄的价值。方法选取2019年11月至2020年10月在南京医科大学附属淮安第一医院就诊的40例脑血管狭窄患者为研究对象,选取符合研究要求的大脑中动脉及基底动脉共120根。在入院1周内完成...目的评价MRI 3D T2-SPACE诊断大脑中动脉及基底动脉狭窄的价值。方法选取2019年11月至2020年10月在南京医科大学附属淮安第一医院就诊的40例脑血管狭窄患者为研究对象,选取符合研究要求的大脑中动脉及基底动脉共120根。在入院1周内完成颅颈动脉MRI 3D T2-SPACE和数字减影血管造影(DSA)检查,分别评估动脉狭窄程度。按狭窄程度分成轻度(1%~49%)、中度(50%~69%)、重度(70%~99%)和闭塞(100%),和金标准DSA检查对照,计算灵敏度、特异度,并分析MRI 3D T2-SPACE和DSA诊断结果的一致性。结果MRI 3D T2-SPACE诊断大脑中动脉及基底动脉狭窄/闭塞的灵敏度、特异度结果如下,轻度狭窄分别为90.0%、96.4%,中度狭窄分别为77.8%、98.2%,重度狭窄分别为96.7%、97.8%,闭塞分别为87.5%、100.0%。MRI 3D T2-SPACE与DSA检查诊断大脑中动脉及基底动脉轻、中、重度狭窄及闭塞的一致性分别为0.760、0.760、0.934、0.929。结论MRI 3D T2-SPACE能够较准确地评估大脑中动脉及基底动脉狭窄程度,特别是对重度狭窄及闭塞的诊断与DSA检查结果高度一致,作为血管检查的一种全新技术,其将会在临床发挥重要作用。展开更多
文摘This paper investigates Buck＇s question about which class of spaces is strongly monotonically T2,and if other properties are combined with strongly monotonically T2,which class of spaces could be got. Based on having a cushioned pair-base space and compact strongly monotonically T2 space,some results （Theorems 1--3） are obtained.
文摘Objective Io evaluate changes in morphology of the cesarean scar and uterus between one and two years after cesarean section using high-resolution,three dimensional T2-weighted sampling perfection with application optimized contrast using diflerent flip angle evolutions Magnetic Resonance Imaging(3DT2w SPACE MRI).Methods This prospective study was performed to investigate morphological changes in the cesarean scars and uterus from one to two years after cesarean section using high-resolution,3D T2w SPACE MRI.The healthy volunteers having no childbearing history were recruited as the controls.All data were measured by two experienced radiologists.All data with normal distribution between the one-year and two-year groups were compared using a paired-sample t test or independent t test.Results Finally,46 women took a pelvic MR examination one year after cesarean section,and a subset of 15 completed the same examination again after two years of cesarean section.Both the uterine length and the anterior wall thickness after two years of cesarean section(5.75±0.46 and 1.45±0.35 cm)were significantly greater than those measured at one year(5.33±0.59 and 1.25±0.27 cm)(t=-2.363 and-2.175,P=0.033 and 0.048).No significant difference was shown in myometrial thickness two years after cesarean section(1.45±0.35 cm)with respect to the control group(1.58±0.21 cm,P=0.170).Nine women who underwent MRI twice were considered to have scar diverticula one year after cesarean section,and still had diverticula two years after cesarean section.The thickness,height,and width of the uterine scar showed no significant change from one to two years(all P>0.05).Conclusions 3D T2w SPACE MRI provides overall morphologic details and shows dynamic changes in the scar and the uterus between one and two years after cesarean section.Scar morphology after cesarean section reached relatively stable one year after cesarean section,and uterine morphology was closer to normal two years after cesarean section.
文摘目的研究T2加权脂肪抑制序列(T2-weighted imaging fat suppression,T2WI-FS)影像组学诊断宫颈癌(cervical cancer,CC)淋巴转移及脉管间隙浸润(lymph vascular space invasion,LVSI)的价值。材料与方法回顾性分析2017年6月至2020年6月间66例CC患者临床资料及术前磁共振成像横轴位T2WI-FS图像,勾画病灶感兴趣区域(region of interest,ROI),将患者预处理图像与ROI图像依次导入A.K.软件,提取T2WI-FS图像上病灶组学特征,经特征降维处理后,建立逻辑回归模型影像组学标签,绘制受试者工作特征(receiver operating characteristic,ROC)曲线,分析T2WI-FS组学标签在诊断CC淋巴转移及LVSI中的价值。结果病理检查结果提示存在淋巴转移者共22例,无转移者44例,分析发现,淋巴转移与患者宫颈间质浸润深度及LVSI有关(P值均<0.01);LVSI阳性患者共27例,阴性患者39例,分析发现,LVSI与患者组织分化程度、宫颈间质浸润深度及淋巴结转移有关(P值均<0.01);T2WI-FS影像组学标签评估患者淋巴转移的曲线下面积(area under the area under the curve,AUC)=0.857,诊断敏感度(sensitivity,Sen)=85.0%,特异度(specificity,Spe)=86.7%,评估患者LVSI的AUC=0.807,诊断Sen=68.3%,Spe=88.3%。结论淋巴结转移及LVSI间相互影响,两者均受到宫颈间质浸润深度的影响,T2WI-FS影像组学标签在评估患者淋巴转移及LVSI中均具有较高的效能,在宫颈癌患者术前病情评估,指导手术治疗方案及预后预测中均具有较高的应用价值。
基金Supported by the National Natural Science Foundation of China(11061004)the National Social Science Foundation of China(12BJY055)the Construct Program of the Key Discipline in Hunan Province
文摘目的评价MRI 3D T2-SPACE诊断大脑中动脉及基底动脉狭窄的价值。方法选取2019年11月至2020年10月在南京医科大学附属淮安第一医院就诊的40例脑血管狭窄患者为研究对象,选取符合研究要求的大脑中动脉及基底动脉共120根。在入院1周内完成颅颈动脉MRI 3D T2-SPACE和数字减影血管造影(DSA)检查,分别评估动脉狭窄程度。按狭窄程度分成轻度(1%~49%)、中度(50%~69%)、重度(70%~99%)和闭塞(100%),和金标准DSA检查对照,计算灵敏度、特异度,并分析MRI 3D T2-SPACE和DSA诊断结果的一致性。结果MRI 3D T2-SPACE诊断大脑中动脉及基底动脉狭窄/闭塞的灵敏度、特异度结果如下,轻度狭窄分别为90.0%、96.4%,中度狭窄分别为77.8%、98.2%,重度狭窄分别为96.7%、97.8%,闭塞分别为87.5%、100.0%。MRI 3D T2-SPACE与DSA检查诊断大脑中动脉及基底动脉轻、中、重度狭窄及闭塞的一致性分别为0.760、0.760、0.934、0.929。结论MRI 3D T2-SPACE能够较准确地评估大脑中动脉及基底动脉狭窄程度,特别是对重度狭窄及闭塞的诊断与DSA检查结果高度一致,作为血管检查的一种全新技术,其将会在临床发挥重要作用。
