3T TOF MRA在颅内血管病变中的应用——与DSA对照

目的:评价3T TOF-MRA在颅内血管病变中的诊断价值。材料和方法:37例临床上具有神经系统症状的病人前瞻性行3T TOF-MRA及脑血管数字减影血管造影检查(DSA)。其中男性16例,女性21例,平均年龄53.5±13.5(21～74)岁。MRA图像分别由2位神经影像医师阅读,DSA图像由神经介入医师阅读,其结论与前两者有分歧的地方,经讨论确立一致观点。以DSA检查作为标准,评价3T TOF-MRA诊断颅内血管性病变的敏感性、特异性及准确性。结果:DSA检查14例15个动脉瘤,5例动静脉畸形,3例3侧大脑中动脉狭窄,1例大脑后动脉闭塞;14例未见明显异常。TOF-MRA准确显示了其中的22处病变(14个动脉瘤,4个动静脉畸形及4处血管狭窄),但误诊1例,假阳性4例,假阴性2例;其总体诊断敏感性、特异性、准确性分别为91.3%、75%和为85%。结论:3.0T TOF-MRA能够很好地显示颅内血管病变,是一种可靠的无创评价方法。     

64层螺旋CT2种后处理技术在颅内动脉瘤检查中的应用

目的 探讨64层螺旋CT 2种后处理技术对颅内动脉瘤的诊断价值.方法 对58例临床高度怀疑动脉瘤患者CTA图像进行回顾性分析,由2位资深放射科医师对原始图像进行VR、MIP后处理,以手术或DSA结果为金标准,分别计算VR、MIP、VR+MIP后处理技术诊断颅内动脉瘤的敏感性、特异性、漏诊率.结果 CTA证实10例无动脉瘤,48例有动脉瘤,图像质量4分42例,3分12例,2分4例,1分0例.VR诊断颅内动脉瘤敏感性96.67%,特异度76.92%,漏诊率23.08%,Youden指数0.73;MIP诊断动脉瘤敏感性96.15%,特异度47.67%,漏诊率52.33%,Youden指数0.44.MIP+VR诊断动脉瘤敏感性96.77%,特异度83.33%,漏诊率16.67%,Youden指数0.80.结论 64层螺旋CT各种后处理技术的联合应用,可显著提高动脉瘤的诊断.     

多层螺旋CT 三维血管造影容积重建成像在颅内动脉瘤中的诊断价值

目的探讨多层面螺旋CT三维血管造影(MS 3D-CTA)容积重建(VR)技术在颅内动脉瘤中的诊断价值.方法对109例临床怀疑颅内动脉瘤的病人行MS 3D-CTA和DSA检查.使用GE Lightspeed pro 16层螺旋CT扫描仪获得原始图像,所有病例均采用VR技术对图像进行三维重建,20例同时有最大密度投影(MIP)辅助检查.VR和MIP后处理图像以及DSA图像由3位放射科医生用双盲法进行分析.结果DSA和手术证实83例共94个动脉瘤,其中单发74例,多发9例(7例2个动脉瘤,2例3个动脉瘤).VR图像上所测动脉瘤大小为1.3～32 mm,与DSA比较无显著性差异(t=1.548,P＞0.05).VR对颅内动脉瘤的敏感度为96.8%,特异度为92.9%,准确度为95.9%,阳性预测值为97.8%,阴性预测值为89.7%;DSA敏感度为97.9%,特异度为96.3%,准确度为97.5%,阳性预测值为98.9%,阴性预测值为92.9%.94个动脉瘤中,89个(94.7%)动脉瘤在VR图像上能清晰显示瘤体、瘤颈与载瘤动脉的三维空间关系,DSA为57个(60.6%).结论MS 3D-CTA VR的敏感度、特异度和准确度均较高,是一种快捷、经济和有效的检查技术.     

三维CT血管造影与平板DSA对颅内动脉瘤诊断价值的对比分析

目的 对比分析多层螺旋CT三维血管造影(3D-CTA)与平板DSA对颅内动脉瘤的诊断价值.方法 对44例自发性蛛网膜下腔出血(SAH)患者同时行3D-CTA及平板DSA(包括2D-DSA、3D-DSA)检查,评价不同检查方法对动脉瘤的诊断效能、3D-CTA容积再现(VR)与3D-DSA容积再现(VR)对共同检出的动脉瘤之瘤体长径差异、瘤颈及载瘤动脉清晰度.结果 44例自发性SAH患者经外科手术或血管内介入证实36例为动脉瘤患者,共46个动脉瘤(其中26例单发,10例多发).3D-CTA共检出40例48个动脉瘤(灵敏度83.33%,特异度75%,阳性预测值75%,阴性预测值66.67%).2D-DSA检出38例患者中44个动脉瘤(灵敏度77.78%,特异度75%,阳性预测值73.68%,阴性预测值75%).3D-DSA最大密度投影(MIP)检出34例动脉瘤患者共44个动脉瘤(灵敏度94.44%.特异度100%,阳性预测值100%,阴性预测值100%).3D-DSA(VR)检出36例动脉瘤患者共46个动脉瘤,无漏诊及误诊.就颅内动脉瘤的检出率方面,3D-CTA与2D-DSA、3D-DSA(MIP)的检出率差异无统计学意义(P>0.05),但3D-CTA(VR)与3D-DSA(VR)的检出率差异有统计学意义(P<0.05).无论是≥3 mm的动脉瘤还是<3 mm的动脉瘤,3D-CTA(VR)与3D-DSA(VR)对瘤体长径的测量差异均无统计学意义(P>0.1).在瘤颈及载瘤动脉清晰度显示方面,3D-CTA(VR)与2D-DSA和3D-DSA(VR)差异均有统计学意义(P<0.05),但3D-CTA(VR)与3D-DSA(MIP)差异无统计学意义(P>0.05).结论 3D-CTA对瘤体长径≥3 mm的颅内动脉瘤有很高的诊断效能,可作为一种微创的常规筛查方法,但对长径<3 mm的颅内动脉瘤有较高的漏诊及误诊率,对其未发现颅内动脉瘤的SSAH患者应进一步行3D-DSA检查.     

磁共振非对比增强血管成像与DSA在颅内动脉瘤诊断的对比分析

目的以数字减影血管造影(DSA)为金标准,对比分析磁共振非对比增强血管成像(3 D-NC-MRA)诊断颅脑动脉瘤及其判断瘤体长度的价值。方法收集2013年9月~2014年8月临床怀疑为颅内动脉瘤的患者65例并进行3 D-NC-MRA及DSA检查,将两种方法所检查出的动脉瘤图像进行后处理并结合原始图像进行综合分析;以DSA为金标准对比分析3 D-NC-MRA所显示颅内动脉瘤结果及二者对动脉瘤瘤体长度检测的差异。结果所有患者DSA检出43例患者有动脉瘤共53个,其中3 mm共15个,≥3 mm共38个;3 D-NC-MRA检查发现50个动脉瘤,其中3 mm共10个,≥3 mm共40个;所有动脉瘤分布于后交通动脉、颈内动脉、大脑中动脉、前交通动脉、基底动脉区域;3 D-NC-MRA对3 mm颅内动脉瘤的灵敏度和特异性分别为66.7%,100%,对≥3 mm的颅内动脉瘤灵敏度和特异性分别为100%,100%;对所有动脉瘤诊断的灵敏度和特异性分别为90.6%、100%。3 D-NC-MRA与DSA比较,所有颅内动脉瘤瘤体长度测量差异均无统计学意义(P0.05)。结论 3 D-NC-MRA对颅内≥3 mm动脉瘤具有较高的检出率和准确性,可以作为临床对颅内动脉瘤的常规诊断方法。而3 mm动脉瘤存在一定漏诊,对于阴性发现者必要时应行DSA进一步检查。     

多层螺旋CT三维血管成像在颅内动脉瘤评价中的初步应用--与DSA的对比研究

目的通过与数字减影血管造影(DSA)的对比研究,初步探讨三维CT血管成像(3D—CTA)在颅内动脉瘤评价中的应用价值。资料与方法对24例临床疑有颅内动脉瘤患者进行3D—CTA和DSA。3D—CTA后处理技术包括多平面重建(MPR)、最大信号强度投影(MIP)以及容积重建(VRT)。3D—CTA和DSA分别由相互独立的放射科医师实施和诊断,分别记录动脉瘤的位置、大小、形态以及与周围动脉分支等的关系。同时调查神经外科医师及患者对两种影像手段的认可度。结果3D—CTA发现13例15个动脉瘤,遗漏1个直径1．2mm的动脉瘤,发现的最小动脉瘤长径为1.8mm。DSA发现14例16个动脉瘤。CTA在显示瘤颈以及相邻骨质结构上明显优于DSA,而DSA空间分辨率较高。神经外科医师多认为CTA可以用作颅内动脉瘤的筛查和术前评估,而DSA仍是金标准。患者对CTA的接受度较高。结论3D—CTA是检查颅内动脉瘤高度敏感的无创影像手段,它可以作为颅内动脉瘤筛查和术前评估的首选技术。     

三维增强磁共振血管造影在颅内动脉瘤中的应用

目的 评价三维增强磁共振血管造影(3D CE-MRA) 在颅内动脉瘤诊断中的应用价值.方法 77例高度怀疑颅内动脉瘤的患者,分别完成3D CE-MRA(图像以VR、MIP、MPR 3种方法显示)和DSA检查,以DSA结果为依据,评价3D CE-MRA对颅内血管瘤的诊断价值.结果 77例中,62例有颅内动脉瘤共73个,3D CE-MRA共诊断65个,漏诊8个.无动脉瘤者15例,3D CE-MRA正确诊断8例,另7例误诊为动脉瘤.3D CE-MRA对动脉瘤的敏感度为89.0%(65/73),特异度为53.3%(8/15),准确度为82.9%[(65+8)/(73+15)].结论 3D CE-MRA对微小动脉瘤及周边部小动脉瘤的确诊率不高,对动脉分叉、动脉圆锥及该处小动脉瘤的诊断应谨慎.     

多层螺旋CT血管造影对颅内动脉瘤的诊断价值

目的:探讨多层螺旋CT血管造影(CTA)对颅内动脉瘤的诊断价值。方法:对36例蛛网膜下腔出血(SAH)的动脉瘤疑似患者均行多层螺旋CT血管造影检查和数字减影血管造影(DSA)检查,将两种检查结果进行对照分析、比较优缺点,CTA后处理采用容积再现(VRT)、最大密度投影(MIP)和表面覆盖法(SSD)。CTA重建采用0.75mm层厚、0.7mm层间隔,延迟扫描时间采用提前监控、静脉团注法。两位放射专家用盲法分析CTA、DSA资料,对颅内动脉瘤作出诊断。结果:36例SAH病例中,CTA发现32例37个动脉瘤,包括前交通动脉瘤15个、大脑前动脉瘤2个、后交通支9个、颈内动脉4个、大脑中动脉主干5个、基底动脉2个,其中1例CTA检查为颈内动脉海绵窦段动脉瘤,直径<3mm,DSA检查为阴性,其余均经DSA证实。4例SAH病例CTA、DSA检查均为阴性。CTA能够清晰显示瘤体、瘤颈、载瘤动脉及毗邻关系,其敏感性为94.5%。动脉瘤直径大于3.0mm者,CTA、DSA检查结果基本一致。CTA以VRT重建效果最佳。结论:CTA对于动脉瘤疑似患者是一种安全、无创伤的检查技术,能够精确显示动脉瘤的空间关系,可作为颅内动脉瘤首选的诊断方法。     

64层CT颅内血管减影成像的应用研究

目的 评估64层CT减影血管成像(subtraction CT angiography,SCTA)的图像质量和在诊断颅内动脉瘤中的临床价值.资料与方法 两名影像医师对32例行SCTA和数字减影血管造影(DSA)的颅内动脉瘤患者资料进行回顾性分析,对SCTA和CT血管成像(CT angiography,CTA)图像质量进行比较,以DSA为金标准对SCTA和CTA诊断颅内动脉瘤的准确性进行评估.结果 SCTA的后处理时间明显少于CTA(P<0.01),SCTA中图像质量优秀占25%(8/32),图像质量好占44%(14/32),图像质量一般占28%(9/32),图像质量较差占3%(1/32).SCTA在颅内动脉瘤整体诊断准确性和颈内动脉(internal carotid artery,ICA)段诊断准确性与CTA相比仅轻度提高(P>0.05),但在脑前动脉(前交通动脉和大脑前动脉交通后段)、大脑中动脉(middle cerebral artery,MCA)和后循环动脉的诊断准确性完全相同.结论 SCTA是一种减影去除邻近血管骨的有效方法,具有好的图像质量并且明显缩短了后处理时间,但诊断准确性无明显改善.     

多层螺旋CT后处理技术在颅内动脉瘤的应用价值研究

目的：探讨多层螺旋CT后处理技术在颅内动脉瘤的应用价值。材料和方法：对36例怀疑颅内动脉瘤的患者行数字减影血管成像（DSA）和盯增强检查，对比分析颅内动脉瘤的多层螺旋CF后处理技术分析结果与DSA结果。结果：36例受检者DSA发现36个动脉瘤，分别为10个位于前交通动脉，9个位于大脑中动脉，7个位于大脑前动脉，4个位于后交通动脉，4个位于大脑中动脉．2个位于基底动脉，36个动脉瘤中，26个为圆形或类圆形．10个为不规则形，平均最长径为5．2mm（2．2mm-15mm）；多层螺旋盯横断面检出率为58．3％，MIP检出率为91．7％，VR检出率为83．3％，MIP＋VR检出率为97．2％。结论：多层螺旋CT后处理技术的应用提高了CT对颅内动脉瘤的诊断价值，可作为外科治疗或介入治疗颅内动脉瘤的筛选方法。     

Acute subarachnoid Haemorrhage: 3D time-of-flight MR angiography versus intra-arterial digital angiography

To evaluate the efficacy and reliability of 3D time-of-flight MR angiography (TOF MRA) as a noninvasive procedure, 27 patients with acute subarachnoid haemorrhage (SAH) were studied with MRA immediately before or after intra-arterial digital subtraction angiography (DSA). 3DTOF MRA was performed with an axial slab of 60 mm centred on the circle of Willis and isotropic voxels. DSA showed 22 aneurysms and 1 dural arteriovenous fistula in 21 patients; the aneurysms ranged in size from 2 to 8 mm. MRA failed to show 2 small aneurysms, at the origin of the posterior and anterior communicating arteries. The 3D display of the intracranial vessels obtained with maximum intensity projection (MIP) or targetted MIP sometimes rendered the aneurysms better than DSA. However, due to its high spatial resolution, DSA more clearly defined the overall anatomy of the walls of the normal and abnormal vessels.1992 Scientific Award of the ESNR     

64层CTA-MIP、CTA-VR与3D-DSA对颅内动脉瘤诊断价值的对比研究

目的对比评价64层螺旋CT最大密度投影(CTA-MIP),CTA容积再现(CTA-VR)与三维数字血管造影(3D-DSA)对颅内动脉瘤(CA)的诊断价值。资料与方法回顾性分析32例经手术及DSA确诊的CA 64层CT血管成像资料,并与DSA进行对照。结果 32例共40个动脉瘤,CTA-MIP发现35个动脉瘤,CTA-VR发现37个动脉瘤,3D-DSA发现39个动脉瘤。40个动脉瘤中11个位于后交通动脉,16个位于大脑中动脉,4个位于基底动脉,1个位于椎动脉,2个位于大脑前动脉,3个位于大脑后动脉,3个位于颈内动脉。3D-DSA与CTA比较,差异无统计学意义。结论在CA影像学诊断上,CTA-MIP、CTA-VR和3D-DSA各有优势,CTA可作为外科治疗或介入治疗的筛选方法。     

多层螺旋CT血管成像诊断颅内动脉瘤的价值

目的:探讨多层螺旋CT血管成像诊断颅内动脉瘤的价值。材料和方法:对比分析21例颅内动脉瘤的多层螺旋CT血管成像(MSCTA)和数字减影血管成像(DSA)的表现。结果:21例中,MSCTA发现21个动脉瘤,DSA发现20个动脉瘤,其中1例双侧动脉瘤,DSA只发现1侧,另1例MSCTA及DSA均未发现病变;21个动脉瘤中18个为圆形或类圆形,3个为不规则形,平均最长径为6.9mm(2.2~15mm);21个动脉瘤1个位于后交通动脉,2个位于基底动脉,5个位于大脑前动脉,5个位于大脑中动脉,8个位于前交通动脉。结论:MSCTA对颅内动脉瘤的诊断具有较高价值,可以作为外科治疗或介入治疗颅内动脉瘤的筛选方法。     

The role of contrast-enhanced MR angiography in the assessment of recently ruptured intracranial aneurysms: a comparative study

We evaluated contrast-enhanced MR angiography (MRA) for the identification of recently ruptured cerebral aneurysms. We studied 23 aneurysms in 18 patients (age range 34–72 years) with aneurysms of the anterior (n=17) and posterior (n=6) circulation by comparing 3D time-of-flight (TOF), contrast-enhanced MRA and digital subtraction angiography (DSA). In four of 23 aneurysms, 3D-TOF did not show the lesion. Contrast-enhanced MRA successfully depicted all aneurysms except one. T1 contamination artefacts from subarachnoid or intraparenchymal haemorrhages were evident on the 3D-TOF images in six cases. The artefacts were completely eliminated on the contrast-enhanced MRA images by subtraction of the pre-contrast images. The diagnostic information in patients with subarachnoid haemorrhages (SAHs) provided by contrast-enhanced MRA was comparable to that provided by DSA.The contents of this article were presented as a poster entitled Contrast-enhanced MR angiography of intracranial aneurysms at the 28th annual meeting of the European Society of Neuroradiology (ESNR), Istanbul, Turkey, 11–14 September 2003     

Three-dimensional time-of-flight MR angiography for evaluation of intracranial aneurysms after endosaccular packing with Guglielmi detachable coils: comparison with 3D digital subtraction angiography

The sensitivities and specificities of three-dimensional time-of-flight MR angiography (3D-TOF MRA) and 3D digital subtraction angiography (3D-DSA) were compared for evaluation of cerebral aneurysms after endosaccular packing with Guglielmi detachable coils (GDCs). Thirty-three patients with 33 aneurysms were included in this prospective study. 3D-TOF MRA and 3D-DSA were performed in the same week on all patients. Maximal intensity projection (MIP) and 3D reconstructed MRA images were compared with 3D-DSA images. The diameters of residual/recurrent aneurysms detected on 3D-DSA were calculated on a workstation. In 3 (9%) of 33 aneurysms, 3D-TOF MRA did not provide reliable information due to significant susceptibility artifacts on MRA. The sensitivity and specificity rates of MRA were 72.7 and 90.9%, respectively, for the diagnosis of residual/recurrent aneurysm. The diameters of residual/recurrent aneurysms that could not be detected by MRA were significantly smaller than those of detected aneurysms (mean 1.1 vs mean 2.3 mm). In one aneurysm of the anterior communicating artery (ACoA), the relationship between the residual aneurysm and the ACoA was more evident on MRA than DSA images. MRA can detect the recurrent/residual lumen of aneurysms treated with GDCs of up to at least 1.8 mm in diameter. 3D-TOF MRA is useful for follow-up of intracranial aneurysms treated with GDCs, and could partly replace DSA.     

颅内动脉瘤DSA检查的显示满意程度分析和最佳体位选择

目的探讨颅内各部位动脉瘤在不同体位的显示满意程度,以便优化体位设计,增加DSA检查对颅内动脉瘤的显示满意度,从而提高检出率。方法197例全脑血管造影中椎动脉造影时常规摄取正、侧位图像,必要时加摄特殊斜位,颈内(颈总)动脉造影时,常规摄取正、侧、斜位1,必要时加摄特殊斜位,分析所有检出动脉瘤的DSA图像资料,评价各部位动脉瘤在不同体位上显示满意程度的差异。结果197例全脑血管造影共检出颅内动脉瘤85例94个,阳性率为43.15%,后交通动脉瘤最多,共51个,占54.3%。后交通动脉瘤侧位均显示良好,占100%,而前交通动脉瘤斜位1均显示良好,占100%。结论合理选择不同角度的斜位,能更清晰地显示动脉瘤的结构及与周围血管的毗邻关系,提高颅内动脉瘤的显示满意程度和检出率。     

3D-T0F MRA对颅内动脉瘤GDC治疗随访的预期评估

目的：评价磁共振血管成像(MRA)在随访43例病人的45个颅内动脉瘤GDC栓塞后的价值。材料和方法：以数字减影血管造影(DSA)作为诊断的金标准，回顾研究43例病人的45个颅内动脉瘤(前循环34个，后循环11个)MRA检查。所有的病人在GDC栓塞治疗后9个月之内的同一周行DSA和MRA检查，这期间不作处理。分析弹簧圈内残余血流、载瘤动脉和邻近动脉血流，MRA以最大强度投影(MIP)重建和源图像为基础。结果：所有病例中，MRA能提供良好的信息。对于动脉瘤的分析，MRA的敏感性、特征性、阳性预测价值、阴性预测价值，诊断弹簧圈内残余血流分别为87．5％、100％、100％、97％，诊断瘤颈的残余血流分别为90％、100％、100％、97％。对于动脉通畅性分析，MRA的敏感性和阴性预测价值，载瘤动脉分别是90．5％和100％，邻近动脉分别是85．7％和100％。结论：在随访GDC栓塞的动脉瘤中，MRA可以作为一个筛选手段，提高检查效率，减少病人的随访风险。     

Diagnostic accuracy of 3D time-of-flight MR angiography compared with digital subtraction angiography for follow-up of coiled intracranial aneurysms: influence of aneurysm size

BACKGROUND AND PURPOSE: 3D time-of-flight MR angiography (3D TOF MRA) may be used as noninvasive alternative to digital subtraction angiography (DSA) for the follow-up of patients with intracranial aneurysms treated with Guglielmi detachable coils (GDCs). We aimed to determine the influence of aneurysm size and location on diagnostic accuracy of 3D TOF MRA for follow-up of intracranial aneurysms treated with GDCs. MATERIALS AND METHODS: Two hundred and one 3D TOF MRAs in 127 consecutive patients with 136 aneurysms were compared with DSA as standard of reference. Sensitivity and specificity of 3D TOF MRA for detection of residual or reperfusion of the aneurysms was calculated with regard to aneurysm size and location. RESULTS: Overall sensitivity and specificity of MRA was 88.5% and 92.9%, respectively. Sensitivity was lower for aneurysms 相似文献   

Comparison of 3D TOF-MRA and 3D CE-MRA at 3 T for imaging of intracranial aneurysms

Purpose

To compare 3 T elliptical-centric CE MRA with 3 T TOF MRA for the detection and characterization of unruptured intracranial aneurysms (UIAs), by using digital subtracted angiography (DSA) as reference.

Materials and methods

Twenty-nine patients (12 male, 17 female; mean age: 62 years) with 41 aneurysms (34 saccular, 7 fusiform; mean diameter: 8.85 mm [range 2.0–26.4 mm]) were evaluated with MRA at 3 T each underwent 3D TOF-MRA examination without contrast and then a 3D contrast-enhanced (CE-MRA) examination with 0.1 mmol/kg bodyweight gadobenate dimeglumine and k-space elliptic mapping (Contrast ENhanced Timing Robust Angiography [CENTRA]). Both TOF and CE-MRA images were used to evaluate morphologic features that impact the risk of rupture and the selection of a treatment. Almost half (20/41) of UIAs were located in the internal carotid artery, 7 in the anterior communicating artery, 9 in the middle cerebral artery and 4 in the vertebro-basilar arterial system.All patients also underwent DSA before or after the MR examination.

Results

The CE-MRA results were in all cases consistent with the DSA dataset. No differences were noted between 3D TOF-MRA and CE-MRA concerning the detection and location of the 41 aneurysms or visualization of the parental artery. Differences were apparent concerning the visualization of morphologic features, especially for large aneurysms (>13 mm). An irregular sac shape was demonstrated for 21 aneurysms on CE-MRA but only 13/21 aneurysms on 3D TOF-MRA. Likewise, CE-MRA permitted visualization of an aneurismal neck and calculation of the sac/neck ratio for all 34 aneurysms with a neck demonstrated at DSA. Conversely, a neck was visible for only 24/34 aneurysms at 3D TOF-MRA. 3D CE-MRA detected 15 aneurysms with branches originating from the sac and/or neck, whereas branches were recognized in only 12/15 aneurysms at 3D TOF-MRA.

Conclusion

For evaluation of intracranial aneurysms at 3 T, 3D CE-MRA is superior to 3D TOF-MRA for assessment of sac shape, detection of aneurysmal neck, and visualization of branches originating from the sac or neck itself, if the size of the aneurysm is greater than 13 mm. 3 T 3D CE-MRA is as accurate and effective as DSA for the evaluation of UIAs.     

Time-of-Flight Magnetic Resonance Angiography for Follow-Up of Coil Embolization with Enterprise Stent for Intracranial Aneurysm: Usefulness of Source Images

Objective

The aim of this study was to determine the interobserver and intermodality agreement in the interpretation of time-of-flight (TOF) MR angiography (MRA) for the follow-up of coiled intracranial aneurysms with the Enterprise stent.

Materials and Methods

Two experienced neurointerventionists independently reviewed the follow-up MRA studies of 40 consecutive patients with 44 coiled aneurysms. All aneurysms were treated with assistance from the Enterprise stent and the radiologic follow-up intervals were greater than 6 months after the endovascular therapy. Digital subtraction angiography (DSA) served as the reference standard. The degree of aneurysm occlusion was determined by an evaluation of the maximal intensity projection (MIP) and source images (SI) of the TOF MRA. The capability of the TOF MRA to depict the residual flow within the coiled aneurysms and the stented parent arteries was compared with that of the DSA.

Results

DSA showed stable occlusions in 25 aneurysms, minor recanalization in 8, and major recanalization in 11. Comparisons between the TOF MRA and conventional angiography showed that the MIP plus SI had almost perfect agreement (κ = 0.892, range 0.767 to 1.000) and had better agreement than with the MIP images only (κ = 0.598, range 0.370 to 0.826). In-stent stenosis of more than 33% was observed in 5 cases. Both MIP and SI of the MRA showed poor depiction of in-stent stenosis compared with the DSA.

Conclusion

TOF MRA seemed to be reliable in screening for aneurysm recurrence after coil embolization with Enterprise stent assistance, especially in the evaluation of the SI, in addition to MIP images in the TOF MRA.