脑静脉血管瘤16层螺旋CT及CTV诊断

目的:探讨16层螺旋CT和CTV对脑静脉血管瘤的诊断价值.方法:回顾性分析10例脑静脉血管瘤的16层螺旋CT平扫、CTA及CTV表现.结果:4例脑静脉血管瘤CT平扫表现为条状或点状略高密度影,1例伴发出血仅发现呈高密度的小脑血肿影,另5例CT平扫未见明显异常.5例动脉期CT血管扫描(CTA)未发现明显异常,5例病灶仅部分显示,且密度淡.10例CTV均清晰显示放射状排列的髓静脉及中央静脉,整个形态似海蛇头.结论:CT平扫对脑静脉血管瘤的诊断价值有限,静脉期的16层螺旋CT血管扫描(CTV)能清晰显示脑静脉血管瘤的影像特征,是诊断本病的可靠方法.     

16层螺旋CT脑静脉成像对颅内正常静脉窦及大静脉的评价

目的 评价16层螺旋CT脑静脉成像(CTV)对颅内正常静脉窦及大静脉的显示能力.资料与方法 利用16层螺旋CT对因各种原因行全脑血管成像的病例中选取脑静脉正常者100例进行分析,得到颅内各主要静脉及静脉窦的显示率并分析成像结果.结果 上矢状窦、横窦、直窦、乙状窦、大脑大静脉、大脑内静脉2分以上显示率为100%;下矢状窦2分以上显示率为82%;丘纹静脉2分以上显示率为97%;透明隔静脉2分以上显示率为81%;脉络膜上静脉2分以上显示率为8l%;基底静脉2分以上显示率为94%;大脑中深静脉2分以上显示率为77%.结论 16层螺旋CTV可以清晰显示颅内各主要静脉系统,能为大脑深静脉性疾病的诊断提供依据.     

脑静脉窦和静脉血栓形成的影像学诊断与分析

目的 探讨脑静脉窦和静脉血栓形成(CVST)的影像特征及诊断体会.方法 回顾性分析28例CVST患者的影像学表现、影像诊断特征.结果 (1)CVST的CT及MRI影像学表现只有少数病例可见典型的"条索状"直接征象(3.57%);最常见的间接征象为非典型性的脑出血(50.00%)及脑梗死(CT:32.14%,MRI:39.29%),发病部位以双侧性较多(75.00%).(2)大部分CVST患者的磁共振静脉成像(MRV)或CT静脉血管成像(CTV)出现静脉窦连续性中断,充盈缺损区,完全性或虫蚀状改变等直接征象(CTV:100%,MRV:83.33%),还可出现远端静脉窦增粗及引流静脉扩张等间接征象.结论 CVST的CT及MRI常规影像学表现无明显特异性,而CTV和MRV影像学表现具有较高的特异性,若怀疑CVST应尽早行MRV或CTV检查以明确诊断.     

脑静脉窦和静脉血栓形成的影像学诊断与分析

目的 探讨脑静脉窦和静脉血栓形成(CVST)的影像特征及诊断体会.方法 回顾性分析28例CVST患者的影像学表现、影像诊断特征.结果 (1)CVST的CT及MRI影像学表现只有少数病例可见典型的"条索状"直接征象(3.57%);最常见的间接征象为非典型性的脑出血(50.00%)及脑梗死(CT:32.14%,MRI:39.29%),发病部位以双侧性较多(75.00%).(2)大部分CVST患者的磁共振静脉成像(MRV)或CT静脉血管成像(CTV)出现静脉窦连续性中断,充盈缺损区,完全性或虫蚀状改变等直接征象(CTV:100%,MRV:83.33%),还可出现远端静脉窦增粗及引流静脉扩张等间接征象.结论 CVST的CT及MRI常规影像学表现无明显特异性,而CTV和MRV影像学表现具有较高的特异性,若怀疑CVST应尽早行MRV或CTV检查以明确诊断.     

16层螺旋CT双期脑血管成像诊断脑静脉血管瘤的价值

目的：探讨16层螺旋CT双期脑血管成像对脑静脉血管瘤的临床诊断价值。方法：回顾性分析15例脑静脉血管瘤的16层螺旋CTA及CTV表现。结果：动脉期CT血管造影5例未发现明显异常，10例病灶仅部分显示，且密度淡。静脉期脑CT血管造影15例均清晰显示放射状排列的髓静脉及中央静脉，整个形态似海蛇头。结论：16层螺旋CT双期血管造影能清晰显示脑静脉血管瘤的影像特征，是诊断本病的可靠方法。     

CTV对脑静脉窦血栓诊断价值的研究

目的探讨CTV对脑静脉窦血栓的诊断价值。方法回顾性分析40例脑静脉窦血栓患者的CTV表现。结果 40例CT平扫中条索征及高密度三角征27例,静脉性出血性脑梗死14例,静脉引流区脑水肿10例。40例CTV中空三角征及静脉窦充盈缺损35例,大脑镰和\或小脑幕异常强化23例,脑穿通髓静脉扩张16例,脑室扩大或缩小18例,不强化的脑白质低密度区18例。结论 CTV对脑静脉窦血栓的诊断具有较高的应用价值,完全能满足临床的早期诊断要求。     

引起搏动性耳鸣的乙状窦沟骨板缺损的CT评价

正摘要目的分析导致搏动性耳鸣的乙状窦沟骨板缺损的CT动脉成像(CTA)及CT静脉成像(CTV)特征。方法收集30例经乙状窦沟骨板缺损重建术治愈的搏动性耳鸣病人作为研究组,60例无症状病人作为对照组。通过CTA及CTV     

脑CT静脉成像及临床应用

脑ＣＴ静脉成像（ＣＴ ｖｅｎｏｇｒａｐｈｙ,ＣＴＶ）是一种新的无创性脑静脉血管成像技术,随着扫描方式、参数选择、对比剂应用以及重建技术的探索和完善,逐渐应用于脑静脉病变的诊断上,并显示出较高的应用价值。本文阐述脑ＣＴＶ的技术特点、临床应用以及与脑磁共振静脉成旬（ｍａｇｎｅｔｉｃ ｒｅｓｏｎａｎｃｅ ｖｅｎｏｇｒａｐｈｙ,ＭＲＶ）及传统血管造影进行比较。     

MRI黑血成像技术对比下肢CT静脉造影评估髂静脉压迫综合征的研究

目的：对比MRI黑血成像技术与下肢CT静脉造影(CTV)在评估髂静脉压迫综合征中的应用。方法：收集可疑髂静脉压迫综合征患者83例,在下肢CTV检查前后2 d内行MRI黑血成像T₁SPACE检查;运用5分法对比T₁SPACE序列及下肢CTV检查在下腔静脉、髂总静脉、髂外静脉及股静脉的图像质量;对比2种检查方法所得患侧髂总静脉最大受压处前后径、对侧同层面髂总静脉前后径、患侧髂总静脉远端前后径、对侧髂总静脉远端前后径及狭窄率。结果：2种检查方法在下腔静脉、髂总静脉、髂外静脉及股静脉的图像质量评分差异均有统计学意义,T₁SPACE图像质量评分均低于CTV(均P<0.001);2种方法的图像质量评分均≥3分,可满足临床诊断需求。T₁SPACE及下肢CTV测量的患侧髂总静脉最大受压处前后径、对侧同层面髂总静脉前后径、患侧髂总静脉远端前后径、对侧髂总静脉远端前后径差异均有统计学意义,T₁SPACE所测值均较CTV低(均P<0.001)。T₁SPACE及CTV...     

动态数字减影CT血管成像在脑血管病诊断中的应用

目的 探讨动态数字减影CT血管成像(DSCTA) 在脑血管病诊断中的应用.方法 收集110例拟诊脑血管病患者动态数字减影CT血管成像检查的影像资料,并结合临床病史、DSA检查、手术结果进行回顾性分析.结果 110例患者经DSCTA检出动脉硬化、狭窄72例,动脉瘤9例,动静脉畸形4例,烟雾病3例,脑静脉畸形2例.DSCTA能良好显示脑内动脉主干及主要分支充盈过程及管腔情况,发现狭窄血管,明确动脉瘤位置、大小、形态、以及与周围血管和颅骨的关系,并能清晰显示脑动静脉畸形的供血动脉和引流静脉.结论 动态数字减影CT血管成像对多种脑血管病的诊断能提供详尽客观的影像依据,具有肯定的临床应用价值.     

Computed tomography pulmonary angiography with pelvic venography in the evaluation of thrombo-embolic disease

A prospective study was performed to evaluate the usefulness of CT pelvic venography (CTV) in the detection of pelvic vein thrombosis in patients referred for CT pulmonary angiography (CTPA) for suspected pulmonary embolism. Fifty consecutive patients referred for CTPA had CTV performed at the time of CTPA. All patients had duplex ultrasound (DUS) of the lower limb veins for evaluation of deep venous thrombosis (DVT) within 24 h of the CT study. Twelve (24%) of the 50 patients had pulmonary embolism diagnosed on CTPA. Associated DVT was detected in six of these patients; two cases were detected by CTV alone, while one case was detected by both CTV and DUS. The remaining three cases had DVT diagnosed by DUS alone. In the 38 patients with a negative CTPA, three patients had venous thrombus diagnosed by CTV. Of these three patients, two had a negative DUS study. CTV therefore led to a definitive imaging diagnosis of thrombo-embolic disease in two (4%) more patients. CTV adds little time and cost to the CTPA examination and leads to a moderate increase in definite imaging diagnosis of thrombo-embolic disease.     

Preoperative evaluation of venous systems with computed tomography venography in parasagittal meningiomas

OBJECTIVE: Parasagittal meningiomas (PSM) may pose a difficult surgical challenge because venous patency and collateral anastomoses have to be clearly defined for correct surgical planning. The aim of this study was to study the diagnostic accuracy of computed tomography venography (CTV) in assessing the superior sagittal sinus (SSS) obstruction and venous collaterals. METHODS: Twenty-four patients undergoing surgery for meningiomas located adjacent to the SSS were prospectively evaluated. All the patients underwent both conventional computed tomography examination and CTV. Computed tomography venography was evaluated by 2 expert neuroradiologists to assess (1) patency of the sinus (patent/occluded), (2) the extent of occlusion (in centimeters), and (3) the number of collateral anastomoses close to the insertion of the meningioma. Computed tomography venography assessment was compared with surgery. All patients were operated on, and intraoperative findings were taken as the criterion standard. RESULTS: Computed tomography venography showed the sinus to be occluded in 6 cases. Computed tomography venography data were confirmed by surgery, showing 6 patients to have have an occlusion of the SSS. The CTV sensitivity was thus 100%. Computed tomography venography depicted 83% of collateral venous anastomoses close to the meningioma as subsequently confirmed by surgery. CONCLUSIONS: In the preoperative planning for patients with meningiomas located close to the SSS, CTV can provide additional and more reliable information concerning venous infiltration and the presence of collateral anastomoses compared with noncontrast computed tomography.     

Non-traumatic thoracic emergencies: CT venography in an integrated diagnostic strategy of acute pulmonary embolism and venous thrombosis

Deep venous thrombosis and pulmonary embolism are the two aspects of venous thrombo-embolism. Investigation of lower limb veins has been part of various diagnostic algorithms in the past 15 years. Recently, the combination of CT venography (CTV) of lower limbs and abdominal veins together with CT angiography of the pulmonary arteries has allowed a complete examination of venous thrombo-embolism in one session. The technical aspects, imaging findings, venous anatomy on CT, interpretative pitfalls, results and advantages of CT venography are reviewed.     

64排螺旋CT静脉造影诊断下肢静脉血栓性病变

目的:探讨64排螺旋CT静脉造影(CTV)诊断下肢静脉血栓性病变的临床价值。材料和方法:下肢多层螺旋CT静脉造影(MSCTV)检查12例,同期均做下肢静脉Dopp ler超声(US)检查;其中1例同时进行了肺动脉CT血管造影,并于延迟2m in时行间接法下肢静脉造影检查。病例均采用5mm层厚和层间距行踝关节至髂骨上缘水平的增强CT扫描,并获得原始图像,图像经1.25mm层厚和50%的重叠处理后传送至工作站进行图像后处理。结果:64排螺旋CTV诊断下肢深静脉血栓(DVT)11例,诊断下肢慢性静脉功能不全1例,同时合并肺栓塞1例。以US作对照,64排螺旋CTV显示股静脉和腘静脉血栓的敏感性为100%,特异性98.6%。MSCTV上DVT表现为静脉腔内不规则低密度充盈缺损,慢性静脉功能不全表现为深静脉边缘不规则且于延迟2m in扫描见其远端引流静脉区造影剂点状残留。结论:64排螺旋CTV在显示股腘静脉血栓与US具有同等价值,MSCTV可作为下肢静脉血栓性病变诊断的常规检查方法。     

CT venography vs ultrasound in the diagnosis of thromboembolic disease in patients with clinical suspicion of pulmonary embolism

To assess the reliability of indirect computed tomography venography (CTV) in the detection of deep venous thrombosis (DVT) in patients with clinical suspicion of pulmonary embolism (PE). 235 consecutive patients with suspicion of PE underwent an imaging protocol composed of a CT pulmonary angiography (CTPA), a CTV and an ultrasound study of the deep venous system, which was considered the “gold standard.” Sensitivity, specificity, and predictive values were calculated for CTV. ith CTV, 30 (12.8%) cases of DVT were detected, 9 (3.8%) of them without pulmonary embolism in CTPA, increasing the diagnosis of thromboembolic disease in 3.8%. However, six of these nine diagnoses were false positives, and CTV missed six cases of DVT. CTV rendered a sensitivity of 58.8%, specificity of 95.0%, a positive predictive value of 66.7%, and a negative predictive value of 93.2%. In patients with clinical suspicion of pulmonary embolism, ultrasound is preferred to CTV for the detection of DVT.     

Does addition of CT pelvic venography to CT pulmonary angiography protocols contribute to the diagnosis of thromboembolic disease?

AIM: To evaluate the contribution which addition of pelvic computed tomography venography (CTV) to a standard CT pulmonary angiography (CTPA) imaging protocol makes to a definitive diagnosis of thromboembolic disease. MATERIALS AND METHODS: One hundred and six consecutive patients over the age of 55 years referred for (CTPA) for suspected pulmonary embolism between June and November 1999 had pelvic CTV performed at the time of the CTPA study. RESULTS: Ninety-six of 106 CTPA studies were technically adequate. In total, 29/96 (29.6%) CTPA studies were positive for pulmonary embolism, 10/96 (10.4%) CTV studies were positive and five of these 10 examinations showed venous thrombus when the CTPA study was negative (n = 4) or equivocal (n = 1). CONCLUSION: Addition of CTV shows residual thrombus in the pelvis in a proportion of patients with positive CTPA studies and demonstrates venous thrombus in a small number of patients with no CT evidence of pulmonary embolism.     

低剂量双期扫描在颅脑CTA中的应用价值

目的:探讨MSCT低剂量双期扫描在脑血管病变的成像质量与诊断价值。方法:41例临床怀疑有脑血管病变的患者行低剂量双期CT动脉及静脉成像检查,另收集41例对照组患者行常规减影CTA;评价2种方法在脑血管的成像质量,测量X线辐射剂量,并从脑血管显示率、病变检出、病变来源、病变定性及与周围组织毗邻情况方面评价低剂量双期CT动脉及静脉成像对脑血管病变的诊断意义。结果:低剂量双期CT动脉及静脉成像的辐射剂量明显低于常规减影CTA,图像质量无明显差异(P=0.975)。低剂量双期CT动脉及静脉成像与常规减影CTA对病变检出质量的比较,5分的病变分别占95.12%,26.83%,低剂量双期CT动脉及静脉成像质量明显高于常规减影CTA(P=0.000)。结论:低剂量双期CT动脉及静脉成像的图像质量无明显下降,辐射剂量明显降低,且能够清晰显示病变来源及与周围组织毗邻情况,病变检出率、病变定性水平均有提高;对脑血管病变有较高的诊断价值。     

64层螺旋CT直接法静脉造影对下肢深静脉血栓的临床应用价值初步研究

目的 探讨64层螺旋CT直接法静脉造影在下肢深静脉血栓(DVT)中的诊断价值. 资料与方法 19例临床怀疑DVT患者行64层螺旋CT直接法下肢深静脉造影检查,着重分析DVT的CT征象,探讨影响其诊断准确性的因素.结果 64层螺旋CT直接法静脉造影对DVT显示较好,在15例患者中共发现DVT 25处,分别位于髂静脉(4)、股静脉(7)、胭静脉(9)和腓静脉(5).结论 64层螺旋CT直接法下肢深静脉造影结合多种后处理技术可以清楚显示DVT,具有较高的临床应用价值.