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
目的探讨磁共振三维可变翻转角快速自旋回波成像技术(SPACE)在显示肺球形病灶内部血管的临床应用价值。方法搜集拟进行胸部CT增强扫描的患者30例,所有患者均在接受CT增强检查后24 h内进行MR检查。扫描序列包括T1WI 3D Star VIBE序列、T2...目的探讨磁共振三维可变翻转角快速自旋回波成像技术(SPACE)在显示肺球形病灶内部血管的临床应用价值。方法搜集拟进行胸部CT增强扫描的患者30例,所有患者均在接受CT增强检查后24 h内进行MR检查。扫描序列包括T1WI 3D Star VIBE序列、T2WI HASTE序列以及T2-SPACE FLOW序列。由2名具有10年以上工作经验的放射科医师采用盲法先对MRI图像上所有病灶中肺血管的显示度进行主观评价,再观察与之对应的CT增强图像上肺血管的显示能力(CT增强图像作为参考标准),评分标准采用4分法(4分:边缘非常清晰,3分:边缘较清晰,2分:边缘不清晰,1分:不可见)。结果 CT增强图像上共检出48个肺球形病灶(大小1.0~5.6 cm),69支肺血管,另于MRI T2-SPACE FLOW序列上,检出48个球形病灶64支肺血管,检出率为94.3%。两名医师对CT增强图像和MRI图像上对肺球形病变内部血管形态显示度的主观评分分别为(3.59±0.46)分和(3.42±0.39)分(医师1)、(3.61±0.22)分和(3.49±0.68)分(医师2),差异均无统计学意义(P>0.05)。结论在显示肺球形病变内部血管中,T2-SPACE FLOW序列具有较高的敏感度及准确率,同时可以提供和CT增强扫描同等效能的肺血管显示度,具有重要的临床价值。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
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
