BACKGROUND AND PURPOSE: CT angiography (CTA) is widely used and may be the only vascular imaging technique ordered for emergent evaluation of neurovascular disease. With thin-section multisection CTA, the resolution of vessel wall imaging has improved. We describe cases of acute vertebral artery dissection (VAD) in which the only abnormality ...

BACKGROUND AND PURPOSE: Internal carotid artery (ICA) atheromatous disease is an important cause of ischemic stroke, and endarterectomy or stent placement is typically indicated for symptomatic patients with > or = 70% stenosis. Our purpose was to compare contrast-enhanced MR angiography (CE-MRA) with unenhanced 2D time-of-flight MR angiography (2D TOF ...

BACKGROUND AND PURPOSE: The distal dural ring (DDR) represents the anatomic border between the extradural and intradural internal carotid arteries (ICAs). The purpose of this study was to examine whether 3D-MR cisternography and MR angiography (MRA) fusion images can identify the boundary between the CSF and the cavernous sinus, which ...

Magnetic resonance angiography (MRA) has become an established imaging modality in the management of lower-limb arterial disease, with emerging roles in treatment planning and follow-up. Contrast-enhanced MRA is now the most widely used technique with clinically acceptable results in the majority of patients. Difficulties in imaging and image interpretation are ...

We report a patient who developed acute myelopathy after intranasal insufflation of amphetamines and heroin. The functional prognosis was very poor; after 4 months, she remained paraplegic. MRI imaging showed selective T2 hyperintensity and intense enhancement confined to the spinal anterior horns and lumbar nerve roots and plexus. This unique ...

It was the aim of this study to discuss the efficacy of computed tomography angiography after failed uterine artery embolization. We performed a review of cases where embolization of myomata failed to relieve symptoms, or shrink myomata. If MRI showed continued uptake, patients were offered CT angiograms to better direct ...

BACKGROUND: Intracranial intra-arterial calcifications (ICAC) are a common finding on head CT examinations, but their significance is not known. The aim of this study is to determine if a relationship exists between ICAC on head CT and the presence of a high-grade atherosclerotic stenosis on cerebral angiography. METHODS: This was ...

De novo generation of axially vascularized tissue with clinically relevant dimensions in a large animal model and implementation of clinically established imaging modalities for in vivo evaluation of vascularization. To be used for reconstruction of tissue defects, engineered grafts need to be axially vascularized to enable transplantation without graft loss ...

OBJECTIVES: To evaluate the efficacy of test injection technique using a monitoring scan at knee level for 64-slice multidetector row computed tomographic (MDCT) angiography of the abdominal and lower extremity arteries. METHODS: The test injection technique using low-dose serial CT scan at knee level was performed for 58 patients. Time ...

We performed 3T magnetic resonance angiography (MRA) during a spontaneous migraine attack. The patient was a 42-year-old woman migraineur diagnosed by the IHS criteria. The change of the middle meningial artery (MMA) was measured on the axial brain images using MATLAB for three phases (attack-free period, during an attack, a ...

PURPOSE: To evaluate the capability of flow-sensitive black blood (FSBB) acquisition to visualize the lenticulostriate artery (LSA) in comparison with time-of-flight (TOF) angiography. MATERIALS AND METHODS: Twenty-one healthy subjects (13 males and 8 females, 19-44 years old) were enrolled in this study after obtaining written informed consent. Magnetic resonance imaging ...

OBJECTIVES: Computed tomography angiography (CTA) is becoming an increasingly accepted noninvasive alternative to catheter angiography. To display continuous vessel contours without superimposed bone in a similar manner, postprocessing of the CTA data is necessary. Threshold-based techniques often fail in regions of close vessel-bone contact, which frequently requires user interaction to ...

PURPOSE: To prospectively compare contrast-enhanced (CE) magnetic resonance (MR) angiography against digital subtraction angiography (DSA) in patients with critical lower-limb ischemia. MATERIALS AND METHODS: Thirty patients with critical lower limb ischemia underwent both CE MR angiography and DSA. CE MR angiography commenced with a dedicated high-resolution study of the below-knee ...

We describe the case of a 60-year-old male hypertensive patient who was admitted to our department with intermittent claudication. An echocardiography evaluation detected apical hypertrophy without an intracavity pressure gradient. Transthoracic echocardiography has been the first-line imaging method for patients with suspected hypertrophic cardiomyopathy (HCM), but the method's shortcomings in ...

Computed tomographic angiography, magnetic resonance angiography and diagnostic arteriography are all vascular diagnostic tools that should be included in modern vascular diagnostic laboratories. Before undertaking the establishment of such a facility, the vascular specialist or group needs to ensure safe patient care and the ability to provide such diagnostic tests ...

Lower-extremity arteriopathy patients can be managed nonsurgically, but there is no standard algorithm for follow-up. The authors present a consensus on appropriate postangioplasty studies in the setting of claudication or a threatened limb. Physical examination with measurements of the ankle-brachial index should be the first step in patients with recurrent ...

OBJECTIVE: The purpose of this study was to evaluate the potential for improving the image quality of 3D bolus-chase peripheral MR angiography by injecting contrast medium at a slow rate. SUBJECTS AND METHODS: Using similar imaging parameters in all cases, we performed bolus-chase MR angiography of the abdominal and lower ...

OBJECTIVE: To evaluate a comprehensive magnetic resonance imaging (MRI) protocol as noninvasive diagnostic modality for simultaneous detection of parenchymal, biliary, and vascular complications after liver transplantation. METHODS: Fifty-two liver transplant recipients suspected to have parenchymal, biliary, and (or) vascular complications underwent our MRI protocol at 1.5T unit using a phased ...

BACKGROUND: Magnetic resonance (MR)-guided vascular interventions are of increasing interest, and, with the use of contrast-enhanced techniques, intraarterial contrast-enhanced MR angiography (ia-ce-MRA) competes with intraarterial digital subtraction angiography (ia-DSA) for the diagnostic evaluation of the infrainguinal vessel tree. PURPOSE: To assess the diagnostic value of ia-ce-MRA and high-resolution T1-weighted (hr-T1w) ...

BACKGROUND: The accuracy of multidetector computed tomographic (CT) angiography involving 64 detectors has not been well established. METHODS: We conducted a multicenter study to examine the accuracy of 64-row, 0.5-mm multidetector CT angiography as compared with conventional coronary angiography in patients with suspected coronary artery disease. Nine centers enrolled patients ...

Summary: Patients with intracranial aneurysm after coiling with Guglielmi detachable coils (GDC) require imaging follow-up. The accuracy of noninvasive magnetic resonance angiography (MRA) techniques including time-of-flight (TOF) and contrast-enhancement (CE) have been compared with the gold standard digital subtraction angiography (DSA).We systematically reviewed the diagnostic accuracy of these imaging methods ...

Accurate preoperative localisation of deep inferior epigastric artery perforator (DIEaP) provides optimal surgical planning for DIEaP flaps. Cross-sectional imaging by contrast-enhanced magnetic resonance angiography (CE-MRA) has advantages over previously described techniques for perforator imaging including reduced radiation exposure and better muscle to vessel contrast. A retrospective series of 10 unilateral ...

Tinnitus may be continuous or pulsatile. Vascular lesions are the most frequent radiologically demonstrable cause of pulsatile tinnitus. These include congenital vascular anomalies (which may be arterial or venous), vascular tumours, and a variety of acquired vasculopathies. The choice of imaging depends on the clinical findings. If a mass is ...

A case of right middle lobe torsion occurring after a right upper lobectomy is described. HR-CT angiography was successful in identifying the obstructed right middle lobe bronchus and the avascular nature of the infected and displaced right middle lobe. This detailed information, obtainable from present day multislice HR-CT scanners with ...

PURPOSE: To qualitatively and quantitatively evaluate the image quality in accelerated time-resolved 3D contrast-enhanced MR angiography (tr-CE-MRA) at 3T. MATERIALS AND METHODS: In all, 113 MRA were performed in 107 patients on a 3T MR system after written informed consent and approval by the ethics committee. Twenty consecutive thoracic (n=87) ...

OBJECTIVE: The purpose of our study was to show the usefulness and limitations of contrast-enhanced time-resolved MR angiography (MRA) for imaging the central veins of the chest. CONCLUSION: Time-resolved MRA is highly sensitive for the detection of abnormalities and is particularly useful in conjunction with static high-spatial-resolution MRA. However, several ...

Three-dimensional time-of-flight magnetic resonance angiography (3D TOF MRA) has been wildly used in the diagnosis of intracranial artery diseases, but it only shows the arterial lumen and does not delineate the vessel wall. The aim of this study was to assess whether high resolution cross sectional magnetic resonance imaging (HRMRI) ...

BACKGROUND: Severe, abrupt onset headache raises concern for aneurysmal subarachnoid hemorrhage (SAH). The current standard work-up is brain CT scan followed by LP if the CT is non-diagnostic in patients with a normal neurological exam. Some have suggested that angiography is also indicated in this common clinical situation. Is evaluation ...

We describe a case of asymptomatic extravasation of iodinated contrast material into the sulci on digital subtraction angiography following carotid angioplasty and stenting resulting in sulcal hyperdensity on computed tomography (CT). We believe the mechanism for this observation is hyperperfusion injury and that in the absence of any associated clinical ...

STUDY DESIGN: Observational study with retrospective computerized tomography (CT) angiography analysis. OBJECTIVE: The purpose of this study is to examine the vertebral artery's course in the V2 segment and define the anatomic variations in the adult population using CT angiography. SUMMARY OF BACKGROUND DATA: The V2 segment of the vertebral ...

BACKGROUND AND PURPOSE: Collateral circulation plays a vital role in patients with steno-occlusive disease, in particular for predicting stroke outcome. Digital subtraction angiography (DSA) is the gold standard for the assessment of collateral circulation, despite its invasive nature. Recently, the development of a new class of arterial spin labeling (ASL) ...

BACKGROUND AND PURPOSE: The purpose of this study was to assess how well the anatomy of the jugular foramen (JF) could be displayed by 3T MR imaging by using a 3D contrast-enhanced fast imaging employing steady-state acquisition sequence (CE-FIESTA) and a 3D contrast-enhanced MR angiographic sequence (CE-MRA). MATERIALS AND METHODS: ...

Conventional catheter-based angiography, magnetic resonance imaging/angiography, and computed tomographic angiography are all techniques routinely practiced for the diagnosis of aneurysms. With regard to the evaluation of treated aneurysms, each of these imaging modalities has inherent advantages and disadvantages. This review was aimed to provide a better understanding of the optimal ...

OBJECTIVES: To discuss the role of magnetic resonance angiography (MRA) in the evaluation of the extracranial carotid system with an emphasis on atherosclerosis and to briefly address the role of magnetic resonance imaging in imaging of carotid atherosclerotic plaque. METHODS: Literature and institutional review. DISCUSSION: The North American Symptomatic Carotid ...

Craniocervical artery dissection is a potentially disabling yet probably underrecognized condition that often occurs in young and middle-aged adults. Accurate and prompt diagnosis of this condition is crucial because timely and appropriate therapy can significantly reduce the risk of stroke and long-term sequelae. Because of the great diversity in the ...

A methodology using magnetic resonance angiography (MRA) is presented for identifying thermally significant blood vessels in isolated kidneys, specifically for use in biothermal model development with application to high intensity focused ultrasound (HIFU). A combination of a proven preservation technique, newly developed MR-compatible experimental procedures and the refinement of MR ...

PURPOSE: A method of diagnosing the extent and severity of arteriovenous fistula (AVF) stenoses is multislice computed tomographic angiography (MS-CTA). The aim of this prospective study was to assess the accuracy of MS-CTA for the detection and grading of stenoses in AVF in comparison to digital subtraction angiography (DSA), which ...

In this paper, a new adaptive bolus-chasing control scheme is proposed to synchronize the bolus peak in a patient's vascular system and the imaging aperture of a computed tomography (CT) scanner. The proposed control scheme is theoretically evaluated and experimentally tested on a modified Siemens SOMATOM Volume Zoom CT scanner. ...

PURPOSE: To prospectively compare the accuracy of high-spatial-resolution steady-state magnetic resonance (MR) angiography with standard-resolution first-pass MR angiography in the lower extremities, with digital subtraction angiography (DSA) as the reference standard. MATERIALS AND METHODS: Institutional ethics committee approval and written informed consent were obtained. Twenty-seven patients (16 men, 11 women; ...

Cardiovascular specialists should be aware of the common types of congenital vascular anomalies and understand their implications for the patient's treatment and the likelihood of associated morbidity. Conventional angiography, the gold standard in vascular imaging, is an invasive and expensive method. Therefore, in recent years, less invasive techniques such as ...

PURPOSE: To compare a standard step-by-step and a newly developed continuous table movement (CTM) technique for peripheral magnetic resonance angiography (MRA) at a 3.0-Tesla MR system equipped with a matrix coil system. MATERIALS AND METHODS: We included 14 consecutive patients referred for peripheral MRA with clinical symptoms of peripheral arterial ...

OBJECTIVES: To assess the feasibility of low-dose time-resolved imaging of contrast kinetics (TRICKS) magnetic resonance (MR) angiography of the pedal vasculature at 3.0 Tesla (T) using a head coil. MATERIALS AND METHODS: Eleven healthy volunteers were imaged using TRICKS MR angiography at 3.0 T with both feet positioned in a ...

PURPOSE: To prospectively compare the diagnostic accuracy and quality of vascular enhancement of 2 contrast agents with different iodine concentrations in 4-detector row computed tomographic angiography of abdominal aorta and lower-extremity arteries. MATERIALS AND METHODS: Forty consecutive patients with peripheral arterial occlusive disease referred for conventional angiography (digital subtraction angiography ...

PURPOSE: To prospectively determine feasibility and diagnostic accuracy of 3D contrast-enhanced MR-angiography (CE-MRA) at 3.0 tesla (T) in patients with peripheral arterial occlusive disease. Digital subtraction angiography (DSA) was used as reference standard. MATERIAL AND METHODS: Thirty consecutive patients with suspected peripheral arterial occlusive disease were examined on a 3.0 ...

A fusion technique for magnetic resonance (MR) angiography and MR imaging was developed to help assess the peritumoral angioarchitecture during surgical planning for meningioma. Three-dimensional time-of-flight (3D-TOF) and 3D-spoiled gradient recalled (SPGR) datasets were obtained from 10 patients with intracranial meningioma, and fused using newly developed volume registration and visualization ...

INTRODUCTION: The purpose of this prospective study was to compare 3T and 1.5T magnetic resonance angiography (MRA) with digital subtraction angiography (DSA) for the follow-up of endovascular treated intracranial aneurysms to assess the grade of occlusion. MATERIALS AND METHODS: Thirty-seven patients with 41 aneurysms who had undergone endovascular treatment with ...

The aim of this study was to determine the accuracy of multidetector row CT angiography in the diagnosis of acute mesenteric ischemia. Ninety-three consecutive studies on 91 patients with clinically suspected acute mesenteric ischemia underwent abdominal CT angiography as the first, and usually the sole, diagnostic procedure. CT was performed ...

OBJECTIVE: In this article, we discuss the neoaortoiliac system procedure, a surgical procedure that uses femoropopliteal vein segments for arterial reconstructions in patients with aortofemoral prosthetic graft infections. CONCLUSION: CT angiography (CTA) is a powerful imaging tool that can be used in the follow-up of patients after this complex surgery. ...

The aim of the study was to carry out a systematic review determining the accuracy of CT angiography in the diagnosis of acute gastrointestinal bleeding. A search of published work in Medline and manual searching of reference lists of articles was conducted. Studies were included if they compared CT angiography ...

BACKGROUND AND PURPOSE: Conventional angiography has been historically considered the gold standard for the diagnosis of cervical artery dissection, but MR imaging/MR angiography (MRA) and CT/CT angiography (CTA) are commonly used noninvasive alternatives. The goal of this study was to compare the ability of multidetector CT/CTA and MR imaging/MRA to ...