Search Results
Results 201 - 250 of 1472
< 1 2 3 4 5 6 7 8 9 10 >
Iwazawa Jin - - 2009
OBJECTIVE: This study compares the diagnostic accuracy of C-arm CT with digital subtraction angiography (DSA) in identifying tumor-feeding arteries during superselective transarterial chemoembolization (TACE). MATERIALS AND METHODS: Thirty-three consecutive patients with hepatocellular carcinoma (HCC) underwent superselective TACE using a flat-detector angiographic system. Angiographic operators determined which feeding arteries were potentially ...
Nicol Edward D - - 2010
There is currently much debate around the limited positive predictive value (PPV) of CT coronary angiography (CTA). There remain no published studies comparing different thresholds to define significant visual stenoses on CTA compared to the gold standard quantitative coronary angiography (QCA). The spatial resolution for ICA is (0.1 mm)(3) compared ...
Thines Laurent - - 2009
INTRODUCTION: Extracranial-intracranial (EC/IC) bypass is a useful procedure for the treatment of cerebral vascular insufficiency or complex aneurysms. We explored the role of multidetector computed tomography angiography (MDCTA), instead of digital subtraction angiography (DSA), for the postoperative assessment of EC/IC bypass patency. METHODS: We retrospectively analyzed a consecutive series of ...
Nielsen Yousef W - - 2009
Whole-body magnetic resonance angiography (WB-MRA) at 3 T with body coil acquisition has not previously been investigated. In this study, WB-MRA was performed in this manner using the blood pool contrast agent gadofosveset trisodium. Eleven consecutive patients (five men, six women) with symptomatic peripheral arterial disease (two with critical limb ...
Takao H - - 2009
The anatomy of the gastric veins and gastric varices is complex, and is difficult to understand even with digital subtraction angiography. In balloon-occluded retrograde transvenous obliteration (BRTO) of gastric varices, accurate assessment of the vascular anatomy is essential for successful treatment. Here, we report the case of a patient with ...
Broderick Joseph P JP Department of Neurology, Center for Stroke and Cerebrovascular Disease, University of Cincinnati Neuroscience Institute, UC College of Medicine, 260 Stetson Street, Cincinnati, OH 45267-0525, USA. - - 2009
The risk of intracranial aneurysm (IA) rupture in asymptomatic members of families who have multiple affected individuals is not known. First-degree unaffected relatives of those with a familial history of IA who had a history of smoking or hypertension but no known IA were offered cerebral MR angiography (MRA) and ...
Sherif Camillo - - 2009
OBJECTIVE: The standard technique of two-dimensional intra-arterial digital subtraction angiography (2D-DSA) for the imaging of experimental rabbit aneurysms is invasive and has considerable surgical risks. Therefore, minimally invasive techniques ideally providing three-dimensional imaging for intervention planning and follow-up are needed. This study evaluates the feasibility and quality of three-dimensional 3-T ...
Yamagami Takuji - - 2009
The purpose of this study was to evaluate the usefulness of a tool that we developed to simulate performance of visceral angiography to train beginners in the field of splanchnic angiography. Seven residents and two fellows who were rotating within the Division of Interventional Radiology at our institution between June ...
Cohen Samuel D - - 2009
OBJECTIVES: The objective of this study is to determine the sensitivity of computed tomography angiography (CTA) and magnetic resonance angiography (MRA) compared to the gold standard, conventional carotid angiography, in the diagnosis of a dural arteriovenous fistula (DAVF). Further objectives include identifying outcomes of treatment and complications as a function ...
Madhusudhan K S - - 2009
To prospectively compare the feasibility, safety and diagnostic role of carbon dioxide (CO(2)) digital subtraction angiography (DSA) using a 'home made' delivery system with iodinated contrast medium (ICM) DSA in the evaluation of peripheral arterial occlusive diseases (PAOD) of lower limbs. Twenty-one patients (27 limbs; all men; mean age, 47.6 ...
Klein Andrew J - - 2009
Endovascular revascularization of the femoropopliteal (FP) artery has been limited by high rates of restenosis and stent fracture. The unique physical forces that are applied to the FP artery during leg movement have been implicated in these phenomena. The foundation for measuring the effects of physical forces on the FP ...
Murota Makiko - - 2009
PURPOSE: We evaluated the patterns of subsubsegmental pulmonary arteries of the right upper lobe (posterior segment: S2; anterior segment: S3) with multiplanar reconstruction (MPR) images by multidetector row computed tomography (MDCT). MATERIALS AND METHODS: A total of 64 patients who had undergone MDCT scans were included in the study. The ...
Met Rosemarie R Department of Radiology, Academic Medical Center, PO Box 22660, 1100 DD Amsterdam, Meibergdreef 9, 1105 AZ Amsterdam, The Netherlands. - - 2009
Computed tomography angiography (CTA) is an increasingly attractive imaging modality for assessing lower extremity peripheral arterial disease (PAD). To determine the accuracy of CTA compared with intra-arterial digital subtraction angiography (DSA) in differentiating extent of disease in patients with PAD. Search of MEDLINE (January 1966-August 2008), EMBASE (January 1980-August 2008), ...
Brinjikji W - - 2009
BACKGROUND AND PURPOSE: Dome-to-neck ratio of intracranial aneurysms is an important predictor of outcomes of endovascular coiling. 3D imaging techniques are increasingly used in evaluating the dome-to-neck ratio of aneurysms for intervention. The purpose of this study was to determine whether 3D rotational angiography (3DRA) can be used to determine ...
Wikström J - - 2009
BACKGROUND: The use of downstream saturation slabs in two-dimensional time-of-flight magnetic resonance angiography (2D TOF MRA) of the arterial system eliminates signal from regions with countercurrent flow, as seen in veins, but possibly also beyond arterial stenoses because of flow turbulence. PURPOSE: To investigate the contribution of a downstream saturation ...
Tomasian Anderanik - - 2009
PURPOSE: To determine the potential role of dynamic temporally resolved three dimensional (3D) contrast-enhanced magnetic resonance angiography (MRA) for quantitative evaluation of pulmonary perfusion in adult patients with surgically treated Tetralogy of Fallot (ToF). MATERIALS AND METHODS: Institutional review board approval and written informed consent were obtained for this Health ...
Poschenrieder Florian - - 2009
OBJECTIVE: The objective of our study was to prospectively evaluate the diagnostic accuracy of intraarterial (i.a.) and i.v. MR angiography (MRA) of the infrainguinal arteries in comparison with the reference standard selective digital subtraction angiography (DSA). SUBJECTS AND METHODS: Twenty consecutive patients with symptomatic peripheral arterial occlusive disease (PAOD) underwent ...
Korkiakoski A - - 2009
BACKGROUND: Recent studies indicate that diminished blood flow may cause low back symptoms and intervertebral disc degeneration. PURPOSE: To explore the association between lumbar arterial stenosis as detected by two-dimensional time-of-flight magnetic resonance angiography (2D TOF-MRA) and lumbar pain symptoms in an occupational cohort of middle-aged Finnish males. MATERIAL AND ...
Sheikh Mehraj - - 2009
OBJECTIVES: The aim of this prospective study was to assess the accuracy of 64-multidetector-row computed tomography coronary angiography (CTA) in the diagnosis of coronary artery disease (CAD). PATIENTS AND METHODS: Ninety-two patients suspected of having CAD underwent CTA using a 64-slice CT scanner before a scheduled, conventional coronary angiogram (CCA). ...
Farsad Khashayar - - 2009
Computerized tomographic angiography (CTA) has emerged as a valuable diagnostic tool for the management of patients with cerebrovascular disease. The use of CTA in lieu of, or as an adjunct to, conventional cerebral angiography in the management of cerebral aneurysms awaits further experience. In this study, we evaluated the role ...
Siedek Vanessa - - 2009
Preoperative arterial embolization (AE) of paraganglioma (PG) is widely used to diminish intraoperative blood loss. Thereby conditions for a resection of the tumor shall be improved and risks for facial, vagal or hypoglossus nerve injuries are reduced. The vascularization of jugular and tympanic PGs is particularly complex due to collaterals ...
Iozzelli Andrea - - 2009
To test true-fast imaging with steady-state precession (true-FISP) added to gadolinium-based MR angiography (Gd-MRA) for imaging abdominal aorta and major abdominal vessels, 35 consecutive patients (age 67+/-11 years) with known or suspected abdominal and/or peripheral vascular disease were studied with sagittal and axial 2D true-FISP during free breathing and coronal ...
Habibi R - - 2009
BACKGROUND AND PURPOSE: High-resolution contrast-enhanced MR angiography (CE-MRA) acquired at 3T exquisitely depict carotid artery (CA) stenosis. In this study, we examined the agreement of different vessel-analysis tools with manual quantitative measurement by 2 readers using CE-MRA data. MATERIALS AND METHODS: Three vessel tools determining the trajectory of the vessel ...
Planken R N - - 2008
PURPOSE: To determine prospectively the clinical value of contrast-enhanced magnetic resonance angiography (CE-MRA) for assessment of the arterial inflow and venous outflow prior to vascular access (VA) creation. METHODS: Seventy-three patients underwent duplex ultrasonography (DUS) and CE-MRA prior to VA creation for detection of stenoses and occlusions. Two observers read ...
Bueltmann Eva - - 2008
OBJECTIVE: To compare gadobenate dimeglumine (Gd-BOPTA) and gadopentetate dimeglumine (Gd-DTPA) for contrast-enhanced magnetic resonance (MR) angiography of the supraaortic vessels at 3 Tesla. MATERIALS AND METHODS: Twelve healthy volunteers each underwent two contrast-enhanced magnetic resonance angiography examinations, one with Gd-BOPTA and one with Gd-DTPA each at a dose of 0.1 ...
Buhk Jan-Hendrik - - 2009
Following coil embolization of intracranial aneurysms, many centers perform at least one digital subtraction angiography (DSA) continuing with time-of-flight magnetic resonance angiography (TOF-MRA). Angiographic computed tomography (ACT) provides high-resolution data from a rotational acquisition of a c-arm-mounted flat panel detector. This study evaluates possible advantages of applying ACT in aneurysm ...
Ferr?? Jean-Christophe - - 2009
OBJECTIVE: To compare 3D time-of-flight MR angiography (TOF-MRA) at 3 Tesla (3T) with digital subtraction angiography (DSA) for the evaluation of intracranial aneurysm occlusion after endovascular coiling. METHODS: In a prospective study, 51 consecutive patients (25 females, 26 males; median age, 51 years) with 51 saccular aneurysms treated with endovascular ...
Duijm Lucien E M - - 2009
BACKGROUND: The European Best Practice Guidelines on Vascular Access propose magnetic resonance angiography (MRA) of dysfunctional dialysis fistulae and grafts if visualization of the complete arterial inflow and outflow vessels is needed. In a prospective multi-centre study we determined the technical success rate of complete vascular access tree depiction by ...
Lubicz Boris - - 2008
INTRODUCTION: Follow-up of intracranial aneurysms treated by embolisation with detachable coils is mandatory to detect a possible recanalisation. The aim of this study was to compare contrast-enhanced magnetic resonance angiography (CE-MRA) with digital substraction angiography (DSA) used to detect aneurysm recanalisation to determine if DSA is still needed during follow-up. ...
Hayabuchi Yasunobu - - 2010
BACKGROUND: The present study aimed to assess the feasibility of multidetector-row computed tomography (MDCT) for the evaluation of systemic-pulmonary collateral (SPC) arteries in children with congenital heart disease associated with reduced pulmonary blood flow. METHODS: Forty-eight consecutive patients (mean age 9+/-5 months; range, 0-30 months) underwent MDCT angiography of the ...
Santini Francesco - - 2008
PURPOSE: To present a novel postprocessing technique for artery/vein separation and background suppression from contrast-enhanced time-resolved magnetic resonance angiography datasets in order to improve the diagnosis of vessel pathologies and arteriovenous fistulas. MATERIALS AND METHODS: Ten normal, two pathologic datasets of the brain, and one hand angiography dataset were postprocessed. ...
Koktzoglou Ioannis - - 2008
PURPOSE: To determine whether pulsed arterial spin-labeled (pulsed ASL) balanced steady-state free precession (bSSFP) imaging allows for rapid projective depiction of the carotid arteries without electrocardiographic (ECG) gating. MATERIALS AND METHODS: The carotid arteries of six volunteers were scanned at 1.5 T using an ASL two-dimensional bSSFP sequence. Three configurations ...
Utsunomiya Daisuke - - 2008
BACKGROUND: The association between a gadolinium-based contrast material and nephrogenic systemic fibrosis has been discussed. The purpose of our study was to evaluate whether non-contrast enhanced magnetic resonance angiography (MRA) might provide sufficient information of renal artery stenosis. METHODS AND RESULTS: The non-contrast MRA of 26 patients with hypertension was ...
Fukuhara Kenjiro - - 2008
OBJECTIVE: Our aim was to evaluate the efficacy of 3D imaging using multidetector row helical computed tomography (MDCT) in the preoperative assessment of the branching pattern of pulmonary artery (PA) before complete video-assisted thoracoscopic lobectomy (complete VATS lobectomy) for lung cancer. METHODS: Forty-nine consecutive patients with clinical stage I lung ...
Guzman R - - 2008
OBJECTIVES: To determine the accuracy of automated vessel-segmentation software for vessel-diameter measurements based on three-dimensional contrast-enhanced magnetic resonance angiography (3D-MRA). METHOD: In 10 patients with high-grade carotid stenosis, automated measurements of both carotid arteries were obtained with 3D-MRA by two independent investigators and compared with manual measurements obtained by digital ...
Anzalone Nicoletta - - 2008
OBJECTIVES: To compare three-dimensional (3D) time-of-flight (TOF)-magnetic resonance angiography (MRA) at 3 T with 3D TOF-MRA and ultrafast contrast-enhanced (CE)-MRA at 1.5 T and to determine the optimum MRA sequence for follow-up of cerebral aneurysms treated with Guglielmi detachable coils (GDCs). MATERIAL AND METHODS: Twenty-eight patients treated with GDCs for ...
Imizu S - - 2008
OBJECTIVE: The objective of this article was to assess the clinical use and the completeness of clipping with total occlusion of the aneurysmal lumen, real-time assessment of vascular patency in the parent, branching and perforating vessels, intraoperative assessment of blood flow, image quality, spatial resolution and clinical value in difficult ...
Heverhagen Johannes T - - 2008
OBJECTIVES: Magnetic resonance angiography (MRA) is noninvasive and does not require the application of high doses of contrast agents, and thus is used in the clinical routine for evaluation of cerebrovascular diseases, eg, aneurysm and arteriovenous malformations. However, more subtle microvascular disease usually cannot be seen with the resolution capabilities ...
von Ziegler Franz - - 2009
PURPOSE: The present study evaluates clinical feasibility of cardiac multidetector computed tomography angiography (MDCTA) to detect significant stenosis of coronary vessels due to transplant vasculopathy (TVP) after heart transplantation (HTx). METHODS: Twenty-eight consecutive male HTx-recipients scheduled for their annual routine conventional coronary angiography (CCA) additionally underwent 64-slice MDCTA. RESULTS: Two ...
Runck F - - 2008
BACKGROUND AND PURPOSE: MR angiography (MRA) is increasingly used as an alternative to digital subtraction angiography (DSA) to evaluate internal carotid artery (ICA) stenosis. Because MRA is not standardized in data acquisition and postprocessing, we sought to evaluate the effects of different acquisition techniques (time-of-flight MRA [TOF-MRA]) and contrast-enhanced MRA ...
Mueller Daniel - - 2008
Computed tomography angiography (CTA) is useful for diagnosing and planning treatment of heart disease. However, contrast agent in surrounding structures (such as the aorta and left ventricle) makes 3D visualisation of the coronary arteries difficult. This paper presents a composite method employing segmentation and volume rendering to overcome this issue. ...
Cheng Victor - - 2008
OBJECTIVES: We evaluated the technical and clinical utility of visual 5-point coronary stenosis grading on coronary computed tomographic angiography (CCTA). BACKGROUND: The binary approach used to assess coronary stenoses on CCTA does not adequately describe borderline obstructive lesions and limits full expression of clinically useful information. METHODS: From 84 patients ...
Schwab Kristin E - - 2008
OBJECTIVE: Magnetic resonance imaging (MRI) and magnetic resonance angiography (MRA) are being used with increasing frequency for the diagnosis of intracranial aneurysms. Although the literature suggests that MRI and MRA are accurate, we have observed that both are associated with a high likelihood of false-positive results in the diagnosis of ...
Kakeda Shingo - - 2008
PURPOSE: To analyze the influence of matrix and echo time (TE) of three-dimensional time-of-flight (3D TOF) magnetic resonance angiography (MRA) on the depiction of residual flow in aneurysms embolized with platinum coils at 1.5T and 3T. MATERIALS AND METHODS: A simulated intracranial aneurysm of the vascular phantom was loosely packed ...
Anzalone N - - 2008
BACKGROUND AND PURPOSE: Our aim was to compare contrast-enhanced MR angiography (CE-MRA) and 3D time-of-flight (TOF) MRA at 3T for follow-up of coiled cerebral aneurysms. MATERIALS AND METHODS: Fifty-two patients treated with Guglielmi detachable coils for 54 cerebral aneurysms were evaluated at 3T MRA. 3D TOF MRA (TR/TE = 23/3.5; ...
Debrey Sarah M - - 2008
BACKGROUND AND PURPOSE: Accurate diagnosis of the degree of internal carotid artery (ICA) stenosis is needed for decisions regarding optimal stroke prevention. Noninvasive magnetic resonance angiography (MRA) is being proposed and used as a replacement for the gold standard, intra-arterial angiography. Our purpose was to perform a systematic review and ...
Buhk Jan-Hendrik - - 2008
INTRODUCTION: Long-term follow-up after coil embolization of intracranial aneurysms is mandatory to monitor coil compacting and aneurysm recurrence. Most centers perform one digital subtraction angiography (DSA) on follow-up continuing with time-of-flight magnetic resonance angiography (TOF-MRA). This study explores the diagnostic value of TOF-MRA at 1.5 T versus 3 T compared ...
Manniesing Rashindra - - 2008
The purpose of this study was to retrospectively assess the feasibility of a fully automated image postprocessing tool for the segmentation of the arterial cerebrovasculature from computed tomographic (CT) angiography in 27 patients (nine men, 18 women; mean age, 55 years; age range, 33-76 years) with subarachnoid hemorrhage. The institutional ...
Krishnam Mayil S - - 2008
OBJECTIVES: To evaluate the feasibility of three-dimensional (3D) steady-state free-precession (SSFP) magnetic resonance angiography (MRA) using nonselective radiofrequency excitation in the assessment of cardiac morphology, thoracic aorta, main pulmonary, and proximal coronary arteries. MATERIAL AND METHODS: Thirty consecutive patients (19 males; 11 females; age range, 20-74) with various cardiac and ...
Lai Peng P Department of Radiology, Northwestern University, Chicago, Illinois 60611, - - 2008
The four-dimensional (4D) coronary MR angiography (MRA) approach has been developed to eliminate the need for accurate determination of the acquisition window and trigger delay time. Diaphragm navigator (NAV) has been the conventional respiratory gating method for free-breathing coronary MRA. However, NAV echo acquisition interrupts the continuous radiofrequency pulse application ...
< 1 2 3 4 5 6 7 8 9 10 >