BACKGROUND Neurovascular compression(NVC) is the main cause of primary trigeminal neuralgia(TN) and hemifacial spasm(HFS). Microvascular decompression(MVD) is an effective surgical method for the treatment of TN and H...BACKGROUND Neurovascular compression(NVC) is the main cause of primary trigeminal neuralgia(TN) and hemifacial spasm(HFS). Microvascular decompression(MVD) is an effective surgical method for the treatment of TN and HFS caused by NVC. The judgement of NVC is a critical step in the preoperative evaluation of MVD, which is related to the effect of MVD treatment. Magnetic resonance imaging(MRI) technology has been used to detect NVC prior to MVD for several years. Among many MRI sequences, three-dimensional time-of-flight magnetic resonance angiography(3D TOF MRA) is the most widely used. However, 3D TOF MRA has some shortcomings in detecting NVC. Therefore, 3D TOF MRA combined with high resolution T2-weighted imaging(HR T2WI) is considered to be a more effective method to detect NVC.AIM To determine the value of 3D TOF MRA combined with HR T2WI in the judgment of NVC, and thus to assess its value in the preoperative evaluation of MVD.METHODS Related studies published from inception to September 2022 based on PubMed, Embase, Web of Science, and the Cochrane Library were retrieved. Studies that investigated 3D TOF MRA combined with HR T2WI to judge NVC in patients with TN or HFS were included according to the inclusion criteria. Studies without complete data or not relevant to the research topics were excluded. The Quality Assessment of Diagnostic Accuracy Studies checklist was used to assess the quality of included studies. The publication bias of the included literature was examined by Deeks’ test. An exact binomial rendition of the bivariate mixed-effects regression model was used to synthesize data. Data analysis was performed using the MIDAS module of statistical software Stata 16.0. Two independent investigators extracted patient and study characteristics, and discrepancies were resolved by consensus. Individual and pooled sensitivities and specificities were calculated. The I_(2) statistic and Q test were used to test heterogeneity. The study was registered on the website of PROSERO(registration No. CRD42022357158).RESULTS Our search identified 595 articles, of which 12(including 855 patients) fulfilled the inclusion criteria. Bivariate analysis showed that the pooled sensitivity and specificity of 3D TOF MRA combined with HR T2WI for detecting NVC were 0.96 [95% confidence interval(CI): 0.92-0.98] and 0.92(95%CI: 0.74-0.98), respectively. The pooled positive likelihood ratio was 12.4(95%CI: 3.2-47.8), pooled negative likelihood ratio was 0.04(95%CI: 0.02-0.09), and pooled diagnostic odds ratio was 283(95%CI: 50-1620). The area under the receiver operating characteristic curve was 0.98(95%CI: 0.97-0.99). The studies showed no substantial heterogeneity(I2 = 0, Q = 0.001 P = 0.50).CONCLUSION Our results suggest that 3D TOF MRA combined with HR T2WI has excellent sensitivity and specificity for judging NVC in patients with TN or HFS. This method can be used as an effective tool for preoperative evaluation of MVD.展开更多
The optimal velocity encoding of phase-contrast magnetic resonance angiography （PC MRA） in measuring cerebral blood flow volume （BFV） ranges from 60 to 80 cm/s. To verify the accuracy of two-dimensional （2D） PC ...The optimal velocity encoding of phase-contrast magnetic resonance angiography （PC MRA） in measuring cerebral blood flow volume （BFV） ranges from 60 to 80 cm/s. To verify the accuracy of two-dimensional （2D） PC MRA, the present study localized the region of interest at blood vessels of the neck using PC MRA based on three-dimensional time-of-flight sequences, and the velocity encoding was set to 80 cm/s. Results of the measurements showed that the error rate was 7.0±6.0% in the estimation of BFV in the internal carotid artery, the external carotid artery and the ipsilateral common carotid artery. There was no significant difference, and a significant correlation in BFV between internal carotid artery ＋ external carotid artery and ipsilateral common carotid artery. In addition, the BFV of the common carotid artery was correlated with that of the ipsilateral internal carotid artery. The main error was attributed to the external carotid artery and its branches. Therefore, after selecting the appropriate scanning parameters and protocols, 2D PC MRA is more accurate in the determination of BFV in the carotid arteries.展开更多
Today, the use of cardiovascular magnetic resonance(CMR) is widespread in clinical practice. The increased need to evaluate of subtle myocardial changes, coronary artery anatomy, and hemodynamic assessment has prompte...Today, the use of cardiovascular magnetic resonance(CMR) is widespread in clinical practice. The increased need to evaluate of subtle myocardial changes, coronary artery anatomy, and hemodynamic assessment has prompted the development of novel CMR techniques including T1 and T2 mapping, non-contrast angiography and four dimensional(4D) flow. T1 mapping is suitable for diagnosing pathologies affecting extracellular volume such as myocarditis, diffuse myocardial fibrosis and amyloidosis, and is a promising diagnostic tool for patients with iron overload and Fabry disease. T2 mapping is useful in depicting acute myocardial edema and estimating the amount of salvageable myocardium following an ischemic event. Novel angiography techniques, such as the selfnavigated whole-heart or the quiescent-interval singleshot sequence, enable the visualization of the great vessels and coronary artery anatomy without the use of contrast material. The 4D flow technique overcomes the limitations of standard phase-contrast imaging and allows for the assessment of cardiovascular hemodynamics in the great arteries and flow patterns in the cardiac chambers. In conclusion, the future of CMR is heading toward a more reliable quantitative assessment of the myocardium, an improved non-contrast visualization of the coronary artery anatomy, and a more accurate evaluation of the cardiac hemodynamics.展开更多
目的研究高分辨率磁共振成像(high-resolution magnetic resonance imaging,HR-MRI)在颅内动脉瘤测量中的应用价值,并与三维数字减影血管造影(three-dimensional DSA,3D-DSA)、三维时间飞跃法磁共振血管成像(threedimensional time of f...目的研究高分辨率磁共振成像(high-resolution magnetic resonance imaging,HR-MRI)在颅内动脉瘤测量中的应用价值,并与三维数字减影血管造影(three-dimensional DSA,3D-DSA)、三维时间飞跃法磁共振血管成像(threedimensional time of fl ight MRA,3D-TOF MRA)作对比。材料与方法选取2013年10月至2015年3月我院神经外科诊断为颅内动脉瘤的患者25例。患者首先行3D-TOF MRA及HR-MRI扫描,并于1周内行DSA检查。分别在3D-TOF MRA、HR-MRI和3D-DSA图像上测量动脉瘤的宽径,采用配对t检验两两比较3D-TOF MRA、HR-MRI与3D-DSA在测量颅内动脉瘤宽径方面的差异。P<0.05为差异有统计学意义。结果 HR-MRI与3D-DSA、HR-MRI与3D-TOF MRA在测量颅内动脉瘤宽径方面的差异[平均差值分别为(3.16±2.66)mm、(5.15±4.89)mm]均有统计学意义(P1<0.05,P2<0.05),3D-DSA与3D-TOF MRA在测量颅内动脉瘤宽径方面的差异[平均差值为(2.53±5.18)mm]无统计学意义(P3>0.05)。结论 HRMRI与3D-DSA、HR-MRI与3D-TOF MRA在显示颅内动脉瘤宽径方面有差异,可能HR-MRI能更准确地显示颅内动脉瘤实际大小,具有较高的临床应用价值。展开更多
目的:分析门静脉海绵样变性(Cavernous transformation of the portal ven CTPV)三维动态增强磁共振血管成像的表现和特征,探讨对本病诊断及其价值。方法:回顾性分析了24例门静脉海绵样变的磁共振血管成像的图像,观察了其特征性的磁共...目的:分析门静脉海绵样变性(Cavernous transformation of the portal ven CTPV)三维动态增强磁共振血管成像的表现和特征,探讨对本病诊断及其价值。方法:回顾性分析了24例门静脉海绵样变的磁共振血管成像的图像,观察了其特征性的磁共振门静脉成像的表现,所有病例均经临床、实验室及彩超检查,其中14例经手术治疗,2例肝癌门脉主干癌栓伴CTPV患者行肝动脉化疗栓塞术。结果:本组24例CTPV以门静脉主干CTPV为主10例,门静脉主干及左右支均受累者8例,单纯左支或右支4例,肠系膜上静脉水平发生者2例。9例门静脉成像清楚地显示,数条迂曲的侧支循环静脉跨过阻塞部位向肝内匐形延伸,其中7例可在网状、管状扩张的门静脉内见细条状、小点状低信号的栓子,6例清楚地显示,门静脉全程多条细小迂曲的侧支循环静脉缠绕在一起,扭曲成网状血管结构的影像,其它15例见离肝性侧支循环静脉走行、分布情况。结论:三维动态增强磁共振血管成像能准确地提供CTPV位置、严重程度的信息,可直观地评价CTPV,为临床采取正确的治疗措施提供更多有重要价值的信息。展开更多
目的探讨MobiTrak三维对比增强MRA在下肢动脉成像中的应用价值。方法对34例疑有下肢动脉疾病患者,应用MobiTrak技术,行下肢动脉3D CE-MRA扫描,经最大信号强度投影重建获得下肢整体血管图像,并结合原始图像进行综合分析(由两位有经验的...目的探讨MobiTrak三维对比增强MRA在下肢动脉成像中的应用价值。方法对34例疑有下肢动脉疾病患者,应用MobiTrak技术,行下肢动脉3D CE-MRA扫描,经最大信号强度投影重建获得下肢整体血管图像,并结合原始图像进行综合分析(由两位有经验的专业医师采用双盲法评价)。结果结果表明MobiTrak 3D CE-MRA大腿动脉图像质量较好,而小腿动脉图像显示稍差。诊断下肢动脉硬化闭塞症20例,其中17例经手术或DSA证实。结论MobiTrak 3D CE-MRA对下肢动脉疾病患者提供了一种准确可靠、易行的检查手段。展开更多
目的探讨三维同步非增强血管造影和斑块内出血(threedimensionalsimultaneous noncontrast angiography and intra plaque hemorrhage,3D-SNAP)高分辨磁共振成像技术对颅内动脉夹层的诊断价值。材料与方法连续收集2015年1月至2018年3月...目的探讨三维同步非增强血管造影和斑块内出血(threedimensionalsimultaneous noncontrast angiography and intra plaque hemorrhage,3D-SNAP)高分辨磁共振成像技术对颅内动脉夹层的诊断价值。材料与方法连续收集2015年1月至2018年3月陕西省人民医院神经内科43例后循环短暂性脑缺血发作(transientischemicattack,TIA)或脑梗死患者,其中颅内动脉夹层18例,非动脉夹层25例,所有患者均采用PhilipsIngenia 3.0 T MRI获取TOF-MRA、T1WI-VISTA、T2WI、3D-SNAP、CE-T1WI成像,双盲分析各序列颅内动脉夹层征象。采用卡方检验、独立样本t检验分析夹层组与非夹层组临床基本资料以及夹层组各序列影像学特征;利用受试者工作特征(receiveroperating characteristic,ROC)曲线比较各序列对颅内动脉夹层的诊断效能。结果 (1)夹层组年龄较非夹层组低,差异有统计学意义(P<0.05),两组间性别、血压、糖尿病、吸烟差异均无统计学意义。(2)6例患者在TOF-MRA、T2WI、T1WI-VISTA、SNAP及CE-T1WI成像序列同时显示夹层瘤样扩张、真假腔、壁内血肿、内膜瓣征象;颅内动脉夹层壁内血肿、双腔征及内膜瓣显示率高分辨MRI各序列比较差异有统计学意义(P<0.05),SNAP显示壁内血肿最敏感,CE-T1WI显示双腔征、内膜瓣征最敏感。(3) TOF-MRA、T2WI、T1WI-VISTA、3D-SNAP、CE-T1WI、SNAP联合CE-T1WI成像序列诊断颅内动脉夹层ROC曲线下面积分别为0.663、0.492、0.729、0.741、0.752、0.824。结论 3D-SNAP高分辨磁共振成像技术无创性、有效评价颅内动脉夹层具有无限的潜力和广阔的前景。展开更多
基金Supported by the Key Research and Development Plan of Shaanxi Province,No.2021SF-298.
文摘BACKGROUND Neurovascular compression(NVC) is the main cause of primary trigeminal neuralgia(TN) and hemifacial spasm(HFS). Microvascular decompression(MVD) is an effective surgical method for the treatment of TN and HFS caused by NVC. The judgement of NVC is a critical step in the preoperative evaluation of MVD, which is related to the effect of MVD treatment. Magnetic resonance imaging(MRI) technology has been used to detect NVC prior to MVD for several years. Among many MRI sequences, three-dimensional time-of-flight magnetic resonance angiography(3D TOF MRA) is the most widely used. However, 3D TOF MRA has some shortcomings in detecting NVC. Therefore, 3D TOF MRA combined with high resolution T2-weighted imaging(HR T2WI) is considered to be a more effective method to detect NVC.AIM To determine the value of 3D TOF MRA combined with HR T2WI in the judgment of NVC, and thus to assess its value in the preoperative evaluation of MVD.METHODS Related studies published from inception to September 2022 based on PubMed, Embase, Web of Science, and the Cochrane Library were retrieved. Studies that investigated 3D TOF MRA combined with HR T2WI to judge NVC in patients with TN or HFS were included according to the inclusion criteria. Studies without complete data or not relevant to the research topics were excluded. The Quality Assessment of Diagnostic Accuracy Studies checklist was used to assess the quality of included studies. The publication bias of the included literature was examined by Deeks’ test. An exact binomial rendition of the bivariate mixed-effects regression model was used to synthesize data. Data analysis was performed using the MIDAS module of statistical software Stata 16.0. Two independent investigators extracted patient and study characteristics, and discrepancies were resolved by consensus. Individual and pooled sensitivities and specificities were calculated. The I_(2) statistic and Q test were used to test heterogeneity. The study was registered on the website of PROSERO(registration No. CRD42022357158).RESULTS Our search identified 595 articles, of which 12(including 855 patients) fulfilled the inclusion criteria. Bivariate analysis showed that the pooled sensitivity and specificity of 3D TOF MRA combined with HR T2WI for detecting NVC were 0.96 [95% confidence interval(CI): 0.92-0.98] and 0.92(95%CI: 0.74-0.98), respectively. The pooled positive likelihood ratio was 12.4(95%CI: 3.2-47.8), pooled negative likelihood ratio was 0.04(95%CI: 0.02-0.09), and pooled diagnostic odds ratio was 283(95%CI: 50-1620). The area under the receiver operating characteristic curve was 0.98(95%CI: 0.97-0.99). The studies showed no substantial heterogeneity(I2 = 0, Q = 0.001 P = 0.50).CONCLUSION Our results suggest that 3D TOF MRA combined with HR T2WI has excellent sensitivity and specificity for judging NVC in patients with TN or HFS. This method can be used as an effective tool for preoperative evaluation of MVD.
基金the Medical Program of Scientific & Technical Foundation in Xiamen in 2008, No. 3502Z20084028
文摘The optimal velocity encoding of phase-contrast magnetic resonance angiography （PC MRA） in measuring cerebral blood flow volume （BFV） ranges from 60 to 80 cm/s. To verify the accuracy of two-dimensional （2D） PC MRA, the present study localized the region of interest at blood vessels of the neck using PC MRA based on three-dimensional time-of-flight sequences, and the velocity encoding was set to 80 cm/s. Results of the measurements showed that the error rate was 7.0±6.0% in the estimation of BFV in the internal carotid artery, the external carotid artery and the ipsilateral common carotid artery. There was no significant difference, and a significant correlation in BFV between internal carotid artery ＋ external carotid artery and ipsilateral common carotid artery. In addition, the BFV of the common carotid artery was correlated with that of the ipsilateral internal carotid artery. The main error was attributed to the external carotid artery and its branches. Therefore, after selecting the appropriate scanning parameters and protocols, 2D PC MRA is more accurate in the determination of BFV in the carotid arteries.
文摘Today, the use of cardiovascular magnetic resonance(CMR) is widespread in clinical practice. The increased need to evaluate of subtle myocardial changes, coronary artery anatomy, and hemodynamic assessment has prompted the development of novel CMR techniques including T1 and T2 mapping, non-contrast angiography and four dimensional(4D) flow. T1 mapping is suitable for diagnosing pathologies affecting extracellular volume such as myocarditis, diffuse myocardial fibrosis and amyloidosis, and is a promising diagnostic tool for patients with iron overload and Fabry disease. T2 mapping is useful in depicting acute myocardial edema and estimating the amount of salvageable myocardium following an ischemic event. Novel angiography techniques, such as the selfnavigated whole-heart or the quiescent-interval singleshot sequence, enable the visualization of the great vessels and coronary artery anatomy without the use of contrast material. The 4D flow technique overcomes the limitations of standard phase-contrast imaging and allows for the assessment of cardiovascular hemodynamics in the great arteries and flow patterns in the cardiac chambers. In conclusion, the future of CMR is heading toward a more reliable quantitative assessment of the myocardium, an improved non-contrast visualization of the coronary artery anatomy, and a more accurate evaluation of the cardiac hemodynamics.
文摘目的:分析门静脉海绵样变性(Cavernous transformation of the portal ven CTPV)三维动态增强磁共振血管成像的表现和特征,探讨对本病诊断及其价值。方法:回顾性分析了24例门静脉海绵样变的磁共振血管成像的图像,观察了其特征性的磁共振门静脉成像的表现,所有病例均经临床、实验室及彩超检查,其中14例经手术治疗,2例肝癌门脉主干癌栓伴CTPV患者行肝动脉化疗栓塞术。结果:本组24例CTPV以门静脉主干CTPV为主10例,门静脉主干及左右支均受累者8例,单纯左支或右支4例,肠系膜上静脉水平发生者2例。9例门静脉成像清楚地显示,数条迂曲的侧支循环静脉跨过阻塞部位向肝内匐形延伸,其中7例可在网状、管状扩张的门静脉内见细条状、小点状低信号的栓子,6例清楚地显示,门静脉全程多条细小迂曲的侧支循环静脉缠绕在一起,扭曲成网状血管结构的影像,其它15例见离肝性侧支循环静脉走行、分布情况。结论:三维动态增强磁共振血管成像能准确地提供CTPV位置、严重程度的信息,可直观地评价CTPV,为临床采取正确的治疗措施提供更多有重要价值的信息。
文摘目的探讨MobiTrak三维对比增强MRA在下肢动脉成像中的应用价值。方法对34例疑有下肢动脉疾病患者,应用MobiTrak技术,行下肢动脉3D CE-MRA扫描,经最大信号强度投影重建获得下肢整体血管图像,并结合原始图像进行综合分析(由两位有经验的专业医师采用双盲法评价)。结果结果表明MobiTrak 3D CE-MRA大腿动脉图像质量较好,而小腿动脉图像显示稍差。诊断下肢动脉硬化闭塞症20例,其中17例经手术或DSA证实。结论MobiTrak 3D CE-MRA对下肢动脉疾病患者提供了一种准确可靠、易行的检查手段。
文摘目的探讨三维同步非增强血管造影和斑块内出血(threedimensionalsimultaneous noncontrast angiography and intra plaque hemorrhage,3D-SNAP)高分辨磁共振成像技术对颅内动脉夹层的诊断价值。材料与方法连续收集2015年1月至2018年3月陕西省人民医院神经内科43例后循环短暂性脑缺血发作(transientischemicattack,TIA)或脑梗死患者,其中颅内动脉夹层18例,非动脉夹层25例,所有患者均采用PhilipsIngenia 3.0 T MRI获取TOF-MRA、T1WI-VISTA、T2WI、3D-SNAP、CE-T1WI成像,双盲分析各序列颅内动脉夹层征象。采用卡方检验、独立样本t检验分析夹层组与非夹层组临床基本资料以及夹层组各序列影像学特征;利用受试者工作特征(receiveroperating characteristic,ROC)曲线比较各序列对颅内动脉夹层的诊断效能。结果 (1)夹层组年龄较非夹层组低,差异有统计学意义(P<0.05),两组间性别、血压、糖尿病、吸烟差异均无统计学意义。(2)6例患者在TOF-MRA、T2WI、T1WI-VISTA、SNAP及CE-T1WI成像序列同时显示夹层瘤样扩张、真假腔、壁内血肿、内膜瓣征象;颅内动脉夹层壁内血肿、双腔征及内膜瓣显示率高分辨MRI各序列比较差异有统计学意义(P<0.05),SNAP显示壁内血肿最敏感,CE-T1WI显示双腔征、内膜瓣征最敏感。(3) TOF-MRA、T2WI、T1WI-VISTA、3D-SNAP、CE-T1WI、SNAP联合CE-T1WI成像序列诊断颅内动脉夹层ROC曲线下面积分别为0.663、0.492、0.729、0.741、0.752、0.824。结论 3D-SNAP高分辨磁共振成像技术无创性、有效评价颅内动脉夹层具有无限的潜力和广阔的前景。
