Objective: A comparison of the difference between the two types of field MR scan in diagnosis of shoulder joint injury. Method: Randomly selected 153 patients with arthroscopic or open arthroplasty who had shoulder pa...Objective: A comparison of the difference between the two types of field MR scan in diagnosis of shoulder joint injury. Method: Randomly selected 153 patients with arthroscopic or open arthroplasty who had shoulder pain or dysfunction treated in our hospital from 2014 to 2017 were divided into 1.5 T group and 3.0 according to the field strength of MRI examination. Postoperative pathology was a gold standard. The sensitivity, specificity, consistency, and predictive value of two field-strength MRI examinations in the diagnosis of rotator cuff tears were calculated and compared. Results: The sensitivity, specificity, crude consistency, positive predictive value, and negative predictive value of the 1.5 T group were 68.75%, 82.35%, 73.47%, 88.00%, and 58.33%, respectively. The 3.0 T group was 72.22%, 89.47%, 78.18%, 92.86% and 62.96%, the differences between the above indicators were not statistically significant (P > 0.05). Conclusion: There was no difference in the authenticity and benefit index of rotator cuff injury diagnosed by 1.5 T and 3.0 T MRI.展开更多
An ever-increasing number of 3.0 Tesla(T) magnets are installed worldwide. Moving from the standard of 1.5 T to higher field strength implies a number of potential advantage and drawbacks, requiring careful optimizati...An ever-increasing number of 3.0 Tesla(T) magnets are installed worldwide. Moving from the standard of 1.5 T to higher field strength implies a number of potential advantage and drawbacks, requiring careful optimization of imaging protocols or implementation of novel hardware components. Clinical practice and literature review suggest that state-of-the-art 3.0 T is equivalent to 1.5 T in the assessment of focal liver lesions and diffuse liver disease. Therefore, further technical improvements are needed in order to fully exploit the potential of higher field strength.展开更多
目的比较不同场强不同序列伪影的差异。方法制作钛合金水模,分别在1.5 T和3.0 T MRI扫描仪上采用矢状位快速自旋回波(TSE)-T1、TSE-T2、TSE的短反转时间的反转恢复(STIR)的脂肪抑制、TSE的频率选择饱和法(FS)抑制、梯度回波序列(GRE)/...目的比较不同场强不同序列伪影的差异。方法制作钛合金水模,分别在1.5 T和3.0 T MRI扫描仪上采用矢状位快速自旋回波(TSE)-T1、TSE-T2、TSE的短反转时间的反转恢复(STIR)的脂肪抑制、TSE的频率选择饱和法(FS)抑制、梯度回波序列(GRE)/快速小角度激发(FLASH)、扩散加权成像(DWI)等常用序列扫描。分析扫描得到图像伪影特点及进行伪影大小测量。结果GRE/FLASH序列图像和DWI图像伪影最大,FS抑制序列得到图像伪影比STIR序列图像伪影大,各序列伪影形状也有差别。在不同场强下相同类型序列扫描伪影也不同,高场强伪影明显大于低场强伪影。同一场强不同序列伪影大小不同,同一类型序列3.0 T MRI图像伪影比1.5 T MRI图像伪影要大,差异有统计学意义(P<0.05)。结论可以通过场强选择、序列的选择来减少金属植入物磁共振扫描带来的伪影。展开更多
7 T MRI可以显著提高膝关节成像的信噪比及空间分辨率,能够进行超高分辨率成像和功能代谢成像。其通过测定骨、关节软骨、半月板及韧带内的不同成分,可以很好地评估骨质疏松的程度,更早地发现关节软骨和半月板的损伤以及评估损伤修复后...7 T MRI可以显著提高膝关节成像的信噪比及空间分辨率,能够进行超高分辨率成像和功能代谢成像。其通过测定骨、关节软骨、半月板及韧带内的不同成分,可以很好地评估骨质疏松的程度,更早地发现关节软骨和半月板的损伤以及评估损伤修复后的表现,为骨质疏松、骨性关节炎以及半月板损伤的早期诊断与治疗提供有力的依据。就7 T MRI在膝关节病变中的研究进展进行综述。展开更多
目的探讨10孕周胎儿标本脑发育结构的9.4 T超高场强MR影像及其与组织病理学图像的对应关系。方法纳入山东大学齐鲁医学院断层影像解剖学研究中心的6具10孕周发育正常的自发性流产胎儿标本为研究对象。使用9.4 T MR仪行颅脑T 2加权像(T 2...目的探讨10孕周胎儿标本脑发育结构的9.4 T超高场强MR影像及其与组织病理学图像的对应关系。方法纳入山东大学齐鲁医学院断层影像解剖学研究中心的6具10孕周发育正常的自发性流产胎儿标本为研究对象。使用9.4 T MR仪行颅脑T 2加权像(T 2 WI)扫描并三维重建,观察脑组织结构及形态;脑组织切片染色获取组织病理学图像,对比MRI与组织病理学两种检查方法对脑层状结构、侧脑室、小脑等的显示情况。结果10孕周胎儿脑层状结构在9.4 T MRI上显示为4层,组织病理学图像则显示为6层,其中侧脑室层、皮质层、边缘层在MRI与组织病理学图像可清晰显示;MRI所显示的混合的室周层、室下层、中间层、皮质下层于组织病理学图像上显示为室周层,混合的室下层、中间层,皮质下层。侧脑室内脉络丛MRI显示为3层,边缘呈低信号,中间呈稍低信号,中心呈更低信号;组织病理学图像亦表现为3层,边缘为上皮细胞,中间为结缔纤维基质,中心为血管组织:MRI形态学特点与病理图像对应。小脑表面光滑,MRI呈低信号,无法具体显示各层;组织病理学图像各层结构显示清晰,由内至外为中间层、分子层、颗粒前体细胞层。脑组织结构经MRI三维重建可直观显示其形态、位置及毗邻关系。10孕周胎儿脑体积较小,脉络丛位于侧脑室内,侧脑室外为层状结构及大脑半球,小脑匐于中脑后方,局部与中脑相连。脉络丛占侧脑室体积的40.4%±1.3%,侧脑室占大脑半球体积的46.1%±4.7%。结论10孕周胎脑尚处于发育的早期阶段,其9.4 T MRI显示与组织病理学图像显示有很好的一致性,而三维重建可以更好地显示10孕周胎脑结构的特点,为临床医师早期识别胎儿发育相关性疾病提供参考。展开更多
文摘Objective: A comparison of the difference between the two types of field MR scan in diagnosis of shoulder joint injury. Method: Randomly selected 153 patients with arthroscopic or open arthroplasty who had shoulder pain or dysfunction treated in our hospital from 2014 to 2017 were divided into 1.5 T group and 3.0 according to the field strength of MRI examination. Postoperative pathology was a gold standard. The sensitivity, specificity, consistency, and predictive value of two field-strength MRI examinations in the diagnosis of rotator cuff tears were calculated and compared. Results: The sensitivity, specificity, crude consistency, positive predictive value, and negative predictive value of the 1.5 T group were 68.75%, 82.35%, 73.47%, 88.00%, and 58.33%, respectively. The 3.0 T group was 72.22%, 89.47%, 78.18%, 92.86% and 62.96%, the differences between the above indicators were not statistically significant (P > 0.05). Conclusion: There was no difference in the authenticity and benefit index of rotator cuff injury diagnosed by 1.5 T and 3.0 T MRI.
文摘An ever-increasing number of 3.0 Tesla(T) magnets are installed worldwide. Moving from the standard of 1.5 T to higher field strength implies a number of potential advantage and drawbacks, requiring careful optimization of imaging protocols or implementation of novel hardware components. Clinical practice and literature review suggest that state-of-the-art 3.0 T is equivalent to 1.5 T in the assessment of focal liver lesions and diffuse liver disease. Therefore, further technical improvements are needed in order to fully exploit the potential of higher field strength.
文摘目的比较不同场强不同序列伪影的差异。方法制作钛合金水模,分别在1.5 T和3.0 T MRI扫描仪上采用矢状位快速自旋回波(TSE)-T1、TSE-T2、TSE的短反转时间的反转恢复(STIR)的脂肪抑制、TSE的频率选择饱和法(FS)抑制、梯度回波序列(GRE)/快速小角度激发(FLASH)、扩散加权成像(DWI)等常用序列扫描。分析扫描得到图像伪影特点及进行伪影大小测量。结果GRE/FLASH序列图像和DWI图像伪影最大,FS抑制序列得到图像伪影比STIR序列图像伪影大,各序列伪影形状也有差别。在不同场强下相同类型序列扫描伪影也不同,高场强伪影明显大于低场强伪影。同一场强不同序列伪影大小不同,同一类型序列3.0 T MRI图像伪影比1.5 T MRI图像伪影要大,差异有统计学意义(P<0.05)。结论可以通过场强选择、序列的选择来减少金属植入物磁共振扫描带来的伪影。
文摘7 T MRI可以显著提高膝关节成像的信噪比及空间分辨率,能够进行超高分辨率成像和功能代谢成像。其通过测定骨、关节软骨、半月板及韧带内的不同成分,可以很好地评估骨质疏松的程度,更早地发现关节软骨和半月板的损伤以及评估损伤修复后的表现,为骨质疏松、骨性关节炎以及半月板损伤的早期诊断与治疗提供有力的依据。就7 T MRI在膝关节病变中的研究进展进行综述。
文摘目的探讨10孕周胎儿标本脑发育结构的9.4 T超高场强MR影像及其与组织病理学图像的对应关系。方法纳入山东大学齐鲁医学院断层影像解剖学研究中心的6具10孕周发育正常的自发性流产胎儿标本为研究对象。使用9.4 T MR仪行颅脑T 2加权像(T 2 WI)扫描并三维重建,观察脑组织结构及形态;脑组织切片染色获取组织病理学图像,对比MRI与组织病理学两种检查方法对脑层状结构、侧脑室、小脑等的显示情况。结果10孕周胎儿脑层状结构在9.4 T MRI上显示为4层,组织病理学图像则显示为6层,其中侧脑室层、皮质层、边缘层在MRI与组织病理学图像可清晰显示;MRI所显示的混合的室周层、室下层、中间层、皮质下层于组织病理学图像上显示为室周层,混合的室下层、中间层,皮质下层。侧脑室内脉络丛MRI显示为3层,边缘呈低信号,中间呈稍低信号,中心呈更低信号;组织病理学图像亦表现为3层,边缘为上皮细胞,中间为结缔纤维基质,中心为血管组织:MRI形态学特点与病理图像对应。小脑表面光滑,MRI呈低信号,无法具体显示各层;组织病理学图像各层结构显示清晰,由内至外为中间层、分子层、颗粒前体细胞层。脑组织结构经MRI三维重建可直观显示其形态、位置及毗邻关系。10孕周胎儿脑体积较小,脉络丛位于侧脑室内,侧脑室外为层状结构及大脑半球,小脑匐于中脑后方,局部与中脑相连。脉络丛占侧脑室体积的40.4%±1.3%,侧脑室占大脑半球体积的46.1%±4.7%。结论10孕周胎脑尚处于发育的早期阶段,其9.4 T MRI显示与组织病理学图像显示有很好的一致性,而三维重建可以更好地显示10孕周胎脑结构的特点,为临床医师早期识别胎儿发育相关性疾病提供参考。
