目的探究MR 3D CUBE与常规磁共振成像(MRI)在膝关节前交叉韧带损伤中的应用价值。方法选取2022年1月至2024年4月本院收治的136例膝关节前交叉韧带损伤患者,根据患者损伤程度分为Ⅰ级、Ⅱ级和Ⅲ级;患者均进行MR 3D CUBE与常规MRI检查;Ka...目的探究MR 3D CUBE与常规磁共振成像(MRI)在膝关节前交叉韧带损伤中的应用价值。方法选取2022年1月至2024年4月本院收治的136例膝关节前交叉韧带损伤患者,根据患者损伤程度分为Ⅰ级、Ⅱ级和Ⅲ级;患者均进行MR 3D CUBE与常规MRI检查;Kappa检验分析MR 3D CUBE、常规MRI与关节镜诊断的一致性;以关节镜检查结果为金标准,采用四格表分析MR 3D CUBE与常规MRI对膝关节前交叉韧带不同损伤分级的诊断价值;膝关节前交叉韧带损伤治疗效果的影响因素采用Logistic回归分析。结果MR 3D CUBE、常规MRI与关节镜诊断的一致性较好(Kappa=0.664、0.832,P<0.05)。MR 3D CUBE在诊断膝关节前交叉韧带损伤Ⅰ级时准确度为91.91%,Ⅱ级时准确度为91.18%,Ⅲ级时准确度为94.85%;常规MRI在诊断膝关节前交叉韧带损伤Ⅰ级时准确度为85.29%,Ⅱ级时准确度为83.09%,Ⅲ级时准确度为87.50%,MR 3D CUBE在诊断膝关节前交叉韧带损伤Ⅲ级时准确度显著高于常规MRI(P<0.05)。不良组和良好组病程和既往损伤比较有差异(P<0.05)。多因素Logistic回归分析得知,病程和既往损伤是影响膝关节前交叉韧带损伤患者治疗效果的危险因素(P<0.05)。结论MR 3D CUBE与常规MRI均能诊断膝关节前交叉韧带损伤,但MR 3D CUBE诊断效能高于常规MRI,可在临床应用。展开更多
目的:研究MRI 3D CUBE T_(2)序列检查在踝关节外伤患者韧带损伤诊断中的价值。方法:选择2020年4月—2023年4月于白银市第一人民医院就诊的226例踝关节外伤拟行手术术前患者作为研究对象,按照不同检查方式将患者分为观察组(n=126)与对照...目的:研究MRI 3D CUBE T_(2)序列检查在踝关节外伤患者韧带损伤诊断中的价值。方法:选择2020年4月—2023年4月于白银市第一人民医院就诊的226例踝关节外伤拟行手术术前患者作为研究对象,按照不同检查方式将患者分为观察组(n=126)与对照组(n=100)。观察组采用MRI 3D CUBE T_(2)序列检查,对照组采取常规MRI检查。比较两组患侧、健侧距腓前韧带测量结果、诊断效能。结果:两组患侧、健侧距腓前韧带宽度及厚度比较,差异无统计学意义(P>0.05)。观察组Ⅰ级踝关节外伤患者韧带损伤诊断准确度、敏感度、特异度、阳性预测值、阴性预测值高于对照组,Ⅱ级患者准确度、敏感度、阴性预测值高于对照组,Ⅲ级患者准确度、特异度、阳性预测值高于对照组,差异有统计学意义(P<0.05)。结论:MRI 3D CUBE T_(2)序列检查踝关节外伤患者韧带损伤诊断效能高于常规MRI检查,可作为治疗效果评价及康复治疗的重要依据。展开更多
目的:探讨MRI 3D CUBE T2序列检查在踝关节外侧韧带损伤诊断中的应用价值。方法:选取2022年1月至2024年2月本院收治的81例疑似踝关节外侧韧带损伤患者,回顾性分析其临床资料,均接受MRI常规二维序列及MRI 3D CUBE T2序列扫描,以关节镜检...目的:探讨MRI 3D CUBE T2序列检查在踝关节外侧韧带损伤诊断中的应用价值。方法:选取2022年1月至2024年2月本院收治的81例疑似踝关节外侧韧带损伤患者,回顾性分析其临床资料,均接受MRI常规二维序列及MRI 3D CUBE T2序列扫描,以关节镜检查结果为金标准,计算两种检查方式的图像质量及诊断效能。结果:本组81例疑似患者,经关节镜检查证实阳性53例,阴性28例。以关节镜检查结果为金标准,MRI 3D CUBE T2序列检查对踝关节外侧韧带损伤的诊断敏感度、特异性、准确度、阳性预测值、阴性预测值及正确指数均高于常规二维序列,假阳性率、假阴性率低于常规二维序列(P<0.05)。一致性分析发现,MRI 3D CUBE T2序列检查结果与关节镜检查结果之间的一致性Kappa值为0.744,一致性处于较高水平,高于常规二维序列的Kappa值0.572。3D CUBE T2序列扫描图像的边缘清晰度评分高于常规二维序列,运动伪影及模糊程度评分低于常规二维序列(P<0.05)。结论:MRI 3D CUBE T2序列扫描可清晰显示踝关节外侧韧带损伤形态学改变,图像清晰,可有效提高诊断效能,减少漏诊、误诊发生,为临床诊疗提供客观的影像学依据。展开更多
目的探讨MR 3D CUBE T2对踝关节外侧韧带损伤的评估价值,并分析影响踝关节外侧韧带损伤治疗效果的危险因素。方法本研究为前瞻性研究,选取衡水市第四人民医院自2018年9月至2021年12月收治的240例踝关节外侧韧带损伤患者为研究对象。所...目的探讨MR 3D CUBE T2对踝关节外侧韧带损伤的评估价值,并分析影响踝关节外侧韧带损伤治疗效果的危险因素。方法本研究为前瞻性研究,选取衡水市第四人民医院自2018年9月至2021年12月收治的240例踝关节外侧韧带损伤患者为研究对象。所有患者均接受常规MRI和MR 3D CUBE T2,在检查过程中采用双盲手段进行分析。以关节镜检查诊断结果为“金标准”,分析常规MRI、MR 3D CUBE T2与关节镜诊断踝关节外侧韧带损伤的一致性,比较常规MRI和MR 3D CUBE T2的诊断效能。患者均接受踝关节镜微创手术,在术后4周对患者的治疗效果进行评价,将治疗效果良好者纳入良好组,其余患者纳入不良组。比较良好组和不良组患者的临床资料,分析不良治疗效果的影响因素。结果常规MRI、MR 3D CUBE T2与关节镜的诊断一致性较强(Kappa=0.699、0.771,P<0.05)。MR 3D CUBE T2诊断踝关节外侧韧带损伤的特异度高于常规MRI(P<0.05)。良好组患者202例,不良组患者38例。良好组和不良组患者的病程、损伤程度、既往损伤占比、距腓前韧带厚度比较,差异均有统计学意义(P<0.05)。病程、损伤程度、既往损伤、距腓前韧带厚度均是治疗效果不良的独立危险因素(P<0.05)。结论MR 3D CUBE T2对踝关节外侧韧带损伤的评估价值较高;病程、损伤程度、既往损伤、距腓前韧带厚度均是踝关节外侧韧带损伤治疗效果不良的独立危险因素。展开更多
Objective.This study aimed to compare the accuracy of rectal cancer restaging after neoadjuvant therapy with 3D CUBE sequence with 2D T2-weighted fast spin-echo(FSE)sequence.Methods.This retrospective study comprised ...Objective.This study aimed to compare the accuracy of rectal cancer restaging after neoadjuvant therapy with 3D CUBE sequence with 2D T2-weighted fast spin-echo(FSE)sequence.Methods.This retrospective study comprised 72 patients with rectal cancer confirmed by colonoscopy and biopsy.After neoadjuvant therapy,all patients underwent pelvic magnetic resonance imaging(MRI)examination at 1.5T MRI sequences including a single coronal 3D CUBE T2-weighted FSE sequence with 1.4mmthickness and a 2D T2-weighted FSE sequence in the sagittal,coronal and axial planes with 5mmthickness.The total acquisition time of the two sequences was recorded.Results were compared with postsurgical pathology(gold standard).The diagnostic accuracy was evaluated;and receiver operating characteristic(ROC)curves and the area under the curves(AUC)were calculated.Results.The T category staging accuracy of 3D T2WI and 2D T2WI was 81.9% and 72.2%,respectively,for reviewer 1 and 86.1% and 75.0% for reviewer 2.The AUC of 3D was higher than that of 2D(0.878 vs.0.783 for reader 1 and 0.905 vs.0.796 for reader 2;both P<0.05)when judging whether the tumor broke through themuscle layer.There was no significant difference between 3D and 2D in judging whether lymph nodes weremalignant(AUC 0.719 vs.0.698 for reader 1 and 0.740 vs.0.698 for reader 2;both P>0.05).There were no significant differences in the visibility of the rectal wall layer,tumor lesion and the overall image quality(all P>0.05).Compared with 2D sequences,the 3D sequence had shorter acquisition time and higher signal intensity ratio(both P<0.05).Conclusion.3D CUBE T2-weighted sequences offer better diagnostic accuracy in rectal cancer restaging after neoadjuvant therapy when compared with 2D T2-weighted FSE sequences;it has a shorter scanning time and more versatility of orientation reconstruction.展开更多
The developed visualization methods of two dimensional （2D） site and three dimensional （3D） cube representations have been performed to show the orientation of transition dipole, charge transfer, and electron-hole...The developed visualization methods of two dimensional （2D） site and three dimensional （3D） cube representations have been performed to show the orientation of transition dipole, charge transfer, and electron-hole coherence in two-photon absorption （TPA）. The 3D cube representations of transition density can reveal visually the orientation and strength of transition dipole moment, and charge different density show the orientation of charge transfer in TPA. The 2D site representation can reveal visually the electron-hole coherence in TPA. The combination of 2D site and 3D cube representations provide clearly inspect into the charge transfer process and the contribution of excited molecular segments for TPA.展开更多
Ordovician fracture-cavity carbonate reservoir beds are the major type of producing formations in the Tahe oilfield, Tarim Basin. The seismic responses of these beds clearly changes depending on the different distance...Ordovician fracture-cavity carbonate reservoir beds are the major type of producing formations in the Tahe oilfield, Tarim Basin. The seismic responses of these beds clearly changes depending on the different distance of the fracture-cavity reservoir bed from the top of the section. The seismic reflection becomes weak or is absent when the fracture-cavity reservoir beds are less than 20 ms below the top Ordovician. The effect on top Ordovician reflection became weaker with deeper burial of fracture-cavity reservoir beds but the developed deep fracture-cavity reservoir beds caused stronger reflection in the interior of the Ordovician. This interior reflection can be divided into strong long-axis, irregular and bead string reflections, and was present 80 ms below the top Ordovician. Aimed at understanding reflection characteristics, the spectral decomposition technique, which uses frequency to ＂tune-in＂ bed thickness, was used to predict Ordovician fracture-cavity carbonate formations in the Tahe oilfield. Through finely adjusting the processing parameters of spectral decomposition, it was found that the slice at 30 Hz of the tuned data cube can best represent reservoir bed development. Two large N-S-trending strong reflection belts in the mid-western part of the study area along wells TK440- TK427-TK417B and in the eastern part along wells TK404-TK409 were observed distinctly on the 30 Hz slice and 4-D time-frequency data cube carving. A small N-S trending reflection belt in the southern part along wells T403-TK446B was also clearly identified. The predicted reservoir bed development area coincides with the fracture-cavities connection area confirmed by drilling pressure testing results. Deep karst cavities occur basically in three reservoir bed-development belts identified by the Ordovician interior strong reflection. Spectral decomposition proved to be a useful technique in identifying fracture-cavity reservoir beds.展开更多
文摘目的探究MR 3D CUBE与常规磁共振成像(MRI)在膝关节前交叉韧带损伤中的应用价值。方法选取2022年1月至2024年4月本院收治的136例膝关节前交叉韧带损伤患者,根据患者损伤程度分为Ⅰ级、Ⅱ级和Ⅲ级;患者均进行MR 3D CUBE与常规MRI检查;Kappa检验分析MR 3D CUBE、常规MRI与关节镜诊断的一致性;以关节镜检查结果为金标准,采用四格表分析MR 3D CUBE与常规MRI对膝关节前交叉韧带不同损伤分级的诊断价值;膝关节前交叉韧带损伤治疗效果的影响因素采用Logistic回归分析。结果MR 3D CUBE、常规MRI与关节镜诊断的一致性较好(Kappa=0.664、0.832,P<0.05)。MR 3D CUBE在诊断膝关节前交叉韧带损伤Ⅰ级时准确度为91.91%,Ⅱ级时准确度为91.18%,Ⅲ级时准确度为94.85%;常规MRI在诊断膝关节前交叉韧带损伤Ⅰ级时准确度为85.29%,Ⅱ级时准确度为83.09%,Ⅲ级时准确度为87.50%,MR 3D CUBE在诊断膝关节前交叉韧带损伤Ⅲ级时准确度显著高于常规MRI(P<0.05)。不良组和良好组病程和既往损伤比较有差异(P<0.05)。多因素Logistic回归分析得知,病程和既往损伤是影响膝关节前交叉韧带损伤患者治疗效果的危险因素(P<0.05)。结论MR 3D CUBE与常规MRI均能诊断膝关节前交叉韧带损伤,但MR 3D CUBE诊断效能高于常规MRI,可在临床应用。
文摘目的:研究MRI 3D CUBE T_(2)序列检查在踝关节外伤患者韧带损伤诊断中的价值。方法:选择2020年4月—2023年4月于白银市第一人民医院就诊的226例踝关节外伤拟行手术术前患者作为研究对象,按照不同检查方式将患者分为观察组(n=126)与对照组(n=100)。观察组采用MRI 3D CUBE T_(2)序列检查,对照组采取常规MRI检查。比较两组患侧、健侧距腓前韧带测量结果、诊断效能。结果:两组患侧、健侧距腓前韧带宽度及厚度比较,差异无统计学意义(P>0.05)。观察组Ⅰ级踝关节外伤患者韧带损伤诊断准确度、敏感度、特异度、阳性预测值、阴性预测值高于对照组,Ⅱ级患者准确度、敏感度、阴性预测值高于对照组,Ⅲ级患者准确度、特异度、阳性预测值高于对照组,差异有统计学意义(P<0.05)。结论:MRI 3D CUBE T_(2)序列检查踝关节外伤患者韧带损伤诊断效能高于常规MRI检查,可作为治疗效果评价及康复治疗的重要依据。
文摘目的:探讨MRI 3D CUBE T2序列检查在踝关节外侧韧带损伤诊断中的应用价值。方法:选取2022年1月至2024年2月本院收治的81例疑似踝关节外侧韧带损伤患者,回顾性分析其临床资料,均接受MRI常规二维序列及MRI 3D CUBE T2序列扫描,以关节镜检查结果为金标准,计算两种检查方式的图像质量及诊断效能。结果:本组81例疑似患者,经关节镜检查证实阳性53例,阴性28例。以关节镜检查结果为金标准,MRI 3D CUBE T2序列检查对踝关节外侧韧带损伤的诊断敏感度、特异性、准确度、阳性预测值、阴性预测值及正确指数均高于常规二维序列,假阳性率、假阴性率低于常规二维序列(P<0.05)。一致性分析发现,MRI 3D CUBE T2序列检查结果与关节镜检查结果之间的一致性Kappa值为0.744,一致性处于较高水平,高于常规二维序列的Kappa值0.572。3D CUBE T2序列扫描图像的边缘清晰度评分高于常规二维序列,运动伪影及模糊程度评分低于常规二维序列(P<0.05)。结论:MRI 3D CUBE T2序列扫描可清晰显示踝关节外侧韧带损伤形态学改变,图像清晰,可有效提高诊断效能,减少漏诊、误诊发生,为临床诊疗提供客观的影像学依据。
文摘目的探讨MR 3D CUBE T2对踝关节外侧韧带损伤的评估价值,并分析影响踝关节外侧韧带损伤治疗效果的危险因素。方法本研究为前瞻性研究,选取衡水市第四人民医院自2018年9月至2021年12月收治的240例踝关节外侧韧带损伤患者为研究对象。所有患者均接受常规MRI和MR 3D CUBE T2,在检查过程中采用双盲手段进行分析。以关节镜检查诊断结果为“金标准”,分析常规MRI、MR 3D CUBE T2与关节镜诊断踝关节外侧韧带损伤的一致性,比较常规MRI和MR 3D CUBE T2的诊断效能。患者均接受踝关节镜微创手术,在术后4周对患者的治疗效果进行评价,将治疗效果良好者纳入良好组,其余患者纳入不良组。比较良好组和不良组患者的临床资料,分析不良治疗效果的影响因素。结果常规MRI、MR 3D CUBE T2与关节镜的诊断一致性较强(Kappa=0.699、0.771,P<0.05)。MR 3D CUBE T2诊断踝关节外侧韧带损伤的特异度高于常规MRI(P<0.05)。良好组患者202例,不良组患者38例。良好组和不良组患者的病程、损伤程度、既往损伤占比、距腓前韧带厚度比较,差异均有统计学意义(P<0.05)。病程、损伤程度、既往损伤、距腓前韧带厚度均是治疗效果不良的独立危险因素(P<0.05)。结论MR 3D CUBE T2对踝关节外侧韧带损伤的评估价值较高;病程、损伤程度、既往损伤、距腓前韧带厚度均是踝关节外侧韧带损伤治疗效果不良的独立危险因素。
基金This study was supported by grants from the Guangdong Science and Technology Department of China(No.2015A030313109).
文摘Objective.This study aimed to compare the accuracy of rectal cancer restaging after neoadjuvant therapy with 3D CUBE sequence with 2D T2-weighted fast spin-echo(FSE)sequence.Methods.This retrospective study comprised 72 patients with rectal cancer confirmed by colonoscopy and biopsy.After neoadjuvant therapy,all patients underwent pelvic magnetic resonance imaging(MRI)examination at 1.5T MRI sequences including a single coronal 3D CUBE T2-weighted FSE sequence with 1.4mmthickness and a 2D T2-weighted FSE sequence in the sagittal,coronal and axial planes with 5mmthickness.The total acquisition time of the two sequences was recorded.Results were compared with postsurgical pathology(gold standard).The diagnostic accuracy was evaluated;and receiver operating characteristic(ROC)curves and the area under the curves(AUC)were calculated.Results.The T category staging accuracy of 3D T2WI and 2D T2WI was 81.9% and 72.2%,respectively,for reviewer 1 and 86.1% and 75.0% for reviewer 2.The AUC of 3D was higher than that of 2D(0.878 vs.0.783 for reader 1 and 0.905 vs.0.796 for reader 2;both P<0.05)when judging whether the tumor broke through themuscle layer.There was no significant difference between 3D and 2D in judging whether lymph nodes weremalignant(AUC 0.719 vs.0.698 for reader 1 and 0.740 vs.0.698 for reader 2;both P>0.05).There were no significant differences in the visibility of the rectal wall layer,tumor lesion and the overall image quality(all P>0.05).Compared with 2D sequences,the 3D sequence had shorter acquisition time and higher signal intensity ratio(both P<0.05).Conclusion.3D CUBE T2-weighted sequences offer better diagnostic accuracy in rectal cancer restaging after neoadjuvant therapy when compared with 2D T2-weighted FSE sequences;it has a shorter scanning time and more versatility of orientation reconstruction.
基金This work was supported by the National Natural Science Foundation of China （No.10874234, No.20703064, and No.10604012）. Authors thank Prof. Chuan-kui Wang for his valuable suggestions.
文摘The developed visualization methods of two dimensional （2D） site and three dimensional （3D） cube representations have been performed to show the orientation of transition dipole, charge transfer, and electron-hole coherence in two-photon absorption （TPA）. The 3D cube representations of transition density can reveal visually the orientation and strength of transition dipole moment, and charge different density show the orientation of charge transfer in TPA. The 2D site representation can reveal visually the electron-hole coherence in TPA. The combination of 2D site and 3D cube representations provide clearly inspect into the charge transfer process and the contribution of excited molecular segments for TPA.
文摘Ordovician fracture-cavity carbonate reservoir beds are the major type of producing formations in the Tahe oilfield, Tarim Basin. The seismic responses of these beds clearly changes depending on the different distance of the fracture-cavity reservoir bed from the top of the section. The seismic reflection becomes weak or is absent when the fracture-cavity reservoir beds are less than 20 ms below the top Ordovician. The effect on top Ordovician reflection became weaker with deeper burial of fracture-cavity reservoir beds but the developed deep fracture-cavity reservoir beds caused stronger reflection in the interior of the Ordovician. This interior reflection can be divided into strong long-axis, irregular and bead string reflections, and was present 80 ms below the top Ordovician. Aimed at understanding reflection characteristics, the spectral decomposition technique, which uses frequency to ＂tune-in＂ bed thickness, was used to predict Ordovician fracture-cavity carbonate formations in the Tahe oilfield. Through finely adjusting the processing parameters of spectral decomposition, it was found that the slice at 30 Hz of the tuned data cube can best represent reservoir bed development. Two large N-S-trending strong reflection belts in the mid-western part of the study area along wells TK440- TK427-TK417B and in the eastern part along wells TK404-TK409 were observed distinctly on the 30 Hz slice and 4-D time-frequency data cube carving. A small N-S trending reflection belt in the southern part along wells T403-TK446B was also clearly identified. The predicted reservoir bed development area coincides with the fracture-cavities connection area confirmed by drilling pressure testing results. Deep karst cavities occur basically in three reservoir bed-development belts identified by the Ordovician interior strong reflection. Spectral decomposition proved to be a useful technique in identifying fracture-cavity reservoir beds.
