Search Results
Results 251 - 300 of 1474
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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 ...
Bourantas Christos V - - 2009
In this study we investigated the accuracy of monoplane and biplane quantitative coronary angiography in estimating the luminal dimensions, using intracoronary ultrasound as gold standard. Biplane angiography and intracoronary ultrasound were performed in 24 arterial segments. The end-diastolic intracoronary ultrasound frames were manually selected and segmented. In 2 end-diastolic X ...
Agid R - - 2008
BACKGROUND AND PURPOSE: A substantial percentage of coiled aneurysms are associated with persistent filling of an aneurysmal component due to incomplete initial treatment or re-growth. Traditionally follow-up of coiled aneurysms has consisted of repeated intra-arterial cerebral catheter angiography, an invasive procedure with associated risks. Hence, many authors have advocated the ...
Urbach H - - 2008
INTRODUCTION: Since digital subtraction angiography (DSA) carries a low risk of morbidity, and is associated with patient discomfort and higher cost, our objective was to determine whether high-resolution 3-D time-of-flight MR angiography (TOF-MRA) at 3 T may replace DSA in the follow-up of patients after coiling of an intracranial aneurysm. ...
Vaphiades Michael S - - 2008
The management of a patient with a suspected posterior communicating artery aneurysm is discussed with emphasis on neuroimaging including magnetic resonance angiography (MRA), computed tomography angiography (CTA) and intra-arterial digital subtraction angiography (DSA). This paper underscores the advantages and disadvantages of each neuroimaging modality, and is presented in an atlas-type ...
Mowatt G - - 2008
OBJECTIVES: To assess the clinical effectiveness and cost-effectiveness, in different patient groups, of the use of 64-slice or higher computed tomography (CT) angiography, instead of invasive coronary angiography (CA), for diagnosing people with suspected coronary artery disease (CAD) and assessing people with known CAD. DATA SOURCES: Electronic databases were searched ...
Nakayama Y - - 2008
AIM: To determine the optimal contrast medium injection protocol for demonstrating the Adamkiewicz artery (AKA) using 64-detector CT angiography (CTA). MATERIALS AND METHODS: CTA was performed using 64-detector CT. The study population consisted of 80 patients (mean age 67.2 years) with aortoiliac diseases. In the first 60 patients 540 mg ...
Sallustio Fabrizio - - 2008
BACKGROUND AND PURPOSE: To evaluate the potential of a new dynamic MRA sequence (DynAngio) based on arterial spin labeling for the assessment of intracranial collateral flow. METHODS: Twelve patients with unilateral internal carotid artery obstruction were investigated. Different patterns of collateral flow were compared between DynAngio, transcranial color-coded duplex ultrasound, ...
Law Y M - - 2008
OBJECTIVES: To evaluate the accuracy of gadolinium-enhanced magnetic resonance angiography in assessing renal artery stenosis compared to catheter digital subtraction angiography. DESIGN: Retrospective study. SETTING: Singapore General Hospital. PATIENTS: Records of patients who underwent magnetic resonance angiography as well as digital subtraction angiography for assessment of renal artery stenosis from ...
Guo Xiaoming - - 2008
BACKGROUND: The aim of the present study was to prospectively evaluate the sensitivity, specificity, positive and negative likelihood ratios (LR+, LR-) of the ankle - brachial index (ABI), using conventional digital subtraction angiography (DSA) as the reference standard, in the assessment of lower extremity arteries, and to research the threshold ...
Katoh Marcus - - 2008
PURPOSE: To implement a double-inversion bright-blood coronary MR angiography sequence using a cylindrical re-inversion prepulse for selective visualization of the coronary arteries. MATERIALS AND METHODS: Local re-inversion bright-blood magnetization preparation was implemented using a nonselective inversion followed by a cylindrical aortic re-inversion prepulse. After an inversion delay that allows for ...
Schneider Guenther - - 2008
OBJECTIVE: The purpose of our study was to evaluate contrast-enhanced MR angiography (CE-MRA) as a screening procedure for the detection of pulmonary arteriovenous malformations (AVMs) in patients with hereditary hemorrhagic telangiectasia (HTT). MATERIALS AND METHODS: Two hundred three consecutive subjects (patients with diagnosed HHT or first-degree relatives; 87 males, 116 ...
Shetty Anil N - - 2008
Conventional MDCT angiography uses a traditional peripheral i.v. approach for contrast injection; however, we describe our experience with a superior vena cava (SVC) catheter approach for coronary artery MDCT angiography as a potential means of decreasing iodinated contrast volume. Central SVC contrast injection can decrease the contrast volume by 50% ...
Saleh R S - - 2008
BACKGROUND AND PURPOSE: Patients with arteriovenous malformation (AVM) are known to have an elevated risk of complications with conventional catheter angiography (CCA) but nonetheless require monitoring of hemodynamics. Thus, we aimed to evaluate both anatomy and hemodynamics in patients with AVM noninvasively by using contrast-enhanced MR angiography (CE-MRA) at 3T ...
Tsivgoulis Georgios - - 2008
BACKGROUND AND PURPOSE: Evaluation of posterior circulation with single-gate transcranial Doppler (TCD) is technically challenging and yields lower accuracy parameters in comparison to anterior circulation vessels. Transcranial power motion-mode Doppler (PMD-TCD), in addition to spectral information, simultaneously displays in real-time flow signal intensity and direction over 6 cm of intracranial ...
Cohen Emil I - - 2008
PURPOSE: To evaluate the utility of time-resolved MR angiography (TR-MRA), compared with digital subtraction angiography (DSA), in the classification of endoleaks in patients who have undergone endovascular aneurysm repair (EVAR). MATERIALS AND METHODS: Thirty-one patients who had undergone EVAR to repair an abdominal aortic aneurysm were evaluated with both TR-MRA ...
Kakeda Shingo - - 2008
The purpose of this study was to assess the usefulness of a three-dimensional (3D) angiography system using a flat panel detector of direct conversion type in treatments with subsegmental transcatheter arterial chemoembolization (TACE) for hepatocellular carcinomas (HCCs). Thirty-six consecutive patients who underwent hepatic angiography were prospectively examined. First, two radiologists ...
Wikström J J Department of Radiology, Uppsala University Hospital, Uppsala, Sweden. - - 2008
Contrast-enhanced magnetic resonance angiography (CE-MRA) is less prone to flow-related signal intensity loss than three-dimensional time-of-flight (3D TOF) MRA and may therefore be more sensitive for detection of residual patency in platinum coil-treated intracranial aneurysms. To compare MRA and CE-MRA in the follow-up of intracranial aneurysms treated with platinum coils. ...
Nguyen-Huynh Mai N - - 2008
BACKGROUND AND PURPOSE: Digital subtraction angiography (DSA) is regarded as the gold standard in assessing degree of stenosis in intracranial vessels. However, it is invasive and can only be carried out at specialized centers. We sought to compare CT angiography (CTA) to DSA for detection and measurement of stenosis in ...
Alkadhi Hatem - - 2008
AIMS: To prospectively investigate the diagnostic accuracy of dual-source computed tomography coronary angiography (CTCA) to diagnose coronary stenoses in relation to body mass index (BMI), Agatston score (AS), and heart rate (HR) as compared with catheter coronary angiography (CCA). METHODS AND RESULTS: Hundred and fifty consecutive patients (47 female, mean ...
Hammond C J - - 2008
OBJECTIVES: Modern conventional ultrasound is sensitive to slow flow, but may misclassify some tight stenoses as occlusion. Symptomatic patients with tight proximal internal carotid artery stenoses may benefit from carotid endarterectomy but those with occlusion or long-segment disease do not. DESIGN: A prospective study of the diagnostic accuracy of contrast-enhanced ...
Kashyap Vikram S - - 2008
PURPOSE: To compare angiograms, considered the gold standard for diagnostic imaging of peripheral arterial disease (PAD), to the corresponding histological sections of popliteal and tibial vessels obtained after amputation to determine if angiography fails to define atheroma burden in "normal appearing" arteries in patients with PAD. METHODS: Between 2004 and ...
Bozlar Ugur - - 2008
PURPOSE: To define the role of three-dimensional (3D) rotational angiography (RA) for the evaluation of pancreas allografts and compare 3D RA to standard digital subtraction angiography (DSA). MATERIALS AND METHODS: DSA and 3D RA were performed in patients with vascular abnormalities diagnosed on contrast medium-enhanced magnetic resonance (MR) angiography. Patency ...
Chen W - - 2008
The goal of this study was to assess the diagnostic accuracy of 16-row multislice computed tomography angiography (CTA) compared with digital subtraction angiography (DSA) in the detection of aneurysm remnants and arterial patency after clipping of intracranial aneurysms. Thirty-seven consecutive patients with 40 clipped aneurysms (39 of which had ruptured) ...
Dupre S - - 2008
Time-of-flight magnetic resonance angiography is a non-invasive alternative to digital subtraction angiography (DSA) for follow up of coiled intracranial aneurysms. Standard cranial MRA protocols are a compromise between spatial resolution and imaging time. This study compares a standard resolution MRA protocol with a protocol at higher spatial resolution MRA (HR-MRA) ...
Kokkinis C - - 2008
Spontaneous subarachnoid haemorrhage is a clinical condition that may be attributed to various underlying causes, such as rupture of intracranial aneurysms and arteriovenous malformations (AVMs). Suspected cerebrovascular abnormalities can be detected either with digital subtraction angiography (DSA) or with computed tomography angiography (CTA) combined with postprocessing tools, namely multiplanar reformation, ...
Backes W H - - 2008
Novel developments in MR angiography are reviewed that enable non-invasive clinical imaging of normal and abnormal vessels of the spinal cord. Current fast contrast-enhanced MR techniques are able 1) to visualize vessels supplying or draining the spinal cord and 2) to differentiate spinal cord arteries from veins. The localization of ...
Brown Devin L - - 2008
BACKGROUND AND PURPOSE: While sensitive to internal carotid artery (ICA) occlusion, carotid ultrasound can produce false-positive results. CT angiography (CTA) has a high specificity for ICA occlusion and is safer and cheaper than catheter angiography, although less accurate. We determined the cost-effectiveness of CTA versus catheter angiography for confirming an ...
Vuillier Fabrice - - 2008
BACKGROUND AND PURPOSE: The present study was undertaken to assess the ability of bedside transcranial color-coded sonography (TCCS) to define the course and the patterns of the division of the middle cerebral artery (MCA) M1 segment compared with 3D time-of-flight magnetic resonance angiography (MRA) at 3 T. METHODS: Because MRA ...
Hendrikse Jeroen - - 2008
OBJECTIVE: With routine use of non-invasive methods to assess the internal carotid artery, it becomes increasingly important to clarify the diagnostic accuracy of transcranial Doppler (TCD) ultrasound and magnetic resonance angiography (MRA) compared with intra-arterial digital subtraction angiography (iaDSA) for the detection of collateral flow via the major intracerebral collateral ...
Farsad Khashayar - - 2008
While catheter angiography has traditionally been used to assess the caliber and course of the superficial temporal artery prior to its use as a conduit for external carotid artery to internal carotid artery (EC-IC) bypass, computed tomographic angiography (CTA) has become increasingly used in the diagnostic assessment of cerebral vasculature. ...
Hecht Harvey S - - 2008
OBJECTIVES: This study was designed to evaluate the indications for performing multidetector computed tomographic coronary angiography (MDCTA) after catheter-based coronary angiography. BACKGROUND: Appropriateness criteria for MDCTA apply exclusively to patient evaluation prior to catheter-based angiography. METHODS: All MDCTA performed after catheterbased angiography at a tertiary referral center were reviewed. RESULTS: ...
Chen Wenhua - - 2008
OBJECTIVE: Many cases of subarachnoid hemorrhage are the result of rupture of small cerebral aneurysms. The aim of the study was to assess the diagnostic accuracy of 16-row multislice computed tomographic angiography (CTA) in detecting small cerebral aneurysms (<or=5 mm) compared with digital subtraction angiography (DSA), surgical findings, or both. ...
El-Assmy Ahmed - - 2008
The ideal imaging modality should demonstrate the presence or absence of a clinically significant causative vascular lesion which, in high-flow arterial priapism, may need intervention. We report a 22-year-old male with post-traumatic arterial priapism. Doppler US could not reliably identify a significant vascular lesion. Magnetic resonance angiography (MRA) demonstrated the ...
Solakovic Emir - - 2008
INTRODUCTION: Preoperative evaluation of patients with aneurysm of abdominal aorta includes CT angiography. Stenotic changes of iliac arteries greater than 50% imply consideration of aorto-femoral reconstruction in order to avoid upcoming occlusion of iliac arteries in the near future. AIM: Comparison of detection of arterial stenotic changes between CT and ...
Schernthaner R - - 2008
The purpose was to evaluate the accuracy of multidetector CT angiography (MD-CTA) in the morphologic assessment of peripheral arterial occlusive disease (PAOD) compared to digital subtraction angiography (DSA). Fifty consecutive patients referred for DSA of the peripheral arteries due to PAOD were prospectively included in this study and underwent 16-row ...
McKinney A M - - 2008
BACKGROUND AND PURPOSE: Four-section multisection CT angiography (MSCTA) accurately detects aneurysms at or more than 4 mm but is less accurate for those less than 4 mm. Our purpose was to determine the accuracy of 64-section MSCTA (64MSCTA) in aneurysm detection versus combined digital subtraction angiography (DSA) and 3D rotational ...
Stein Sherman C - - 2007
OBJECTIVE: To compare cost-effectiveness of different strategies for completion angiography after cerebral aneurysm clipping. METHODS: A literature search was used to determine the outcome probabilities and costs of various strategies. The pooled results were used in a Markov cost-effectiveness model to compare quality-adjusted life-years and costs of each strategy. Sensitivity ...
Huang Benjamin Y - - 2007
A 50-year-old man presented with neurologic symptoms and upper extremity claudication associated with exercise. Perfusion MRI of the brain showed delayed time-to-peak in the right cerebral hemisphere, and MR angiography (MRA) of the circle of Willis showed decreased flow-related enhancement in the right internal carotid artery and its branches. Neck ...
Rhee Sun Joo - - 2007
Persistent trigeminal artery variant (PTAV) is an anastomosis between the internal carotid artery (ICA) and the cerebellar artery without any interposing basilar artery segment. We discuss its probable embryological origin and emphasize clinical implications. Retrospectively 1250 conventional cerebral angiograms and 2947 cranial magnetic resonance angiographies (MRAs) were evaluated for the ...
Canyigit Murat - - 2009
PURPOSE: The purpose of this study is to find out the prevalence, appearance and clinical symptoms of myocardial bridging (MB) by MDCT coronary angiography (CTA). MATERIALS AND METHODS: A total of 280 (50 females) consecutive patients followed with coronary artery disease or postoperative stent and bypass control, underwent CTA performed ...
Haidary Ahmad - - 2007
OBJECTIVE: To compare the enhancement of the pulmonary and aortic vasculature between a biphasic injection 64-slice, a single-phase injection 16-slice, and a single-phase injection 10-slice multidetector computed tomographic (CT) angiography (CTA) protocols. METHODS: With institutional review board approval and Health Insurance Portability and Accountability Act compliance, 50 patients (16 men, ...
Unno N - - 2008
OBJECTIVE: To introduce our preliminary experience with indocyanine green (ICG) fluorescence angiography for the assessment of lower leg bypasses. METHODS: 1ml of 0.5% indocyanine green was intravenously injected in 9 patients with PAD who underwent paramalleolar artery bypass using saphenous vein grafts. A newly developed near-infrared camera system (PDE; Hamamatsu ...
Korteweg M A - - 2008
AIM: To investigate whether contrast-enhanced magnetic resonance angiography (CE-MRA) and duplex ultrasound (DUS) could replace digital subtraction angiography (DSA) for diagnosing internal carotid artery (ICA) stenosis in regional centres with less specialized technicians and equipment, such as a 1 Tesla MRI machine. MATERIALS AND METHODS: Sixty-six consecutive, symptomatic patients with ...
Romijn M - - 2008
BACKGROUND AND PURPOSE: Our aim was to determine the diagnostic accuracy of multisection CT angiography combined with matched mask bone elimination (CTA-MMBE) for detection of intracranial aneurysms compared with digital subtraction angiography (DSA) and 3D rotational angiography (3DRA). MATERIALS AND METHODS: Between January 2004 and February 2006, 108 patients who ...
Asif Arif - - 2007
BACKGROUND AND OBJECTIVES: Physical examination has been highlighted to detect vascular access stenosis; however, its accuracy in the identification of stenoses when compared with the gold standard (angiography) has not been validated in a systematic manner. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: A prospective study was conducted of 142 consecutive patients ...
Toyota S - - 2008
Recent progress in digital subtraction angiography (DSA) devices makes it possible to perform rotational angiography with high resolution and high sensitivity. We tried intravenous (IV) 3D DSA in patients who had undergone MR angiography (MRA) suggestive of unruptured intracranial aneurysms. IV 3D DSA can be used as an alternative method ...
Malhotra Ajai K - - 2007
OBJECTIVE: Computed tomographic angiography (CTA) by 16-channel multidetector scanner is increasingly replacing conventional digital subtraction angiography (DSA) for diagnosing or excluding blunt carotid/vertebral injuries (BCVI). To date there has been only 1 study in which all patients received both examinations. That study reported a high accuracy for 16-detector CTA. The ...
Hayabuchi Yasunobu - - 2007
BACKGROUND: The purpose of this study is to assess the feasibility of multidetector-row computed tomography (MDCT) for the quantitative evaluation of pulmonary artery morphology in children with congenital heart disease that is associated with reduced pulmonary blood flow. METHODS: Quantification of measurements at the pulmonary artery annulus and right and ...
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