Introduction 7T ToF-MRA has proven to depict the major intracranial arteries in humans with a quality comparable or better than 3T or 1.5T magnets [1]. Ultrahigh field ToF-MRA has also allowed for the visualization of a larger number of the small intracranial arteries that were either not visualized or seen less clearly with lower field strength magnets [2]. The purpose of this study was to eva...

background traditional digital subtraction angiography (dsa) is currently the gold standard diagnostic method for the diagnosis and evaluation of cerebral arteriovenous malformation (avm) and dural arteriovenous fistulas (davf). objectives the aim of this study was to analyze different less invasive magnetic resonance angiography (mra) images, time-resolved mra (tr-mra) and three-dimensional ti...

Background: Circulus Arteriosus cerebrii, another name for Circle of Willis, establishes a polygonal anastomotic channel between two internal carotid arteries and vertebral arteries. The arterial circle is located in the interpeduncular fossa, near base brain. It has been established through anatomical radiological studies that there are variations healthy persons. Aim: To evaluate Willis suppl...

An improved dual-echo sequence magnetic resonance (MR) imaging technique was developed to simultaneously acquire a time-of-flight MR angiogram (MRA) and a blood oxygenation level-dependent MR venogram (MRV) in a single MR acquisition at 3 T. MRA and MRV require conflicting scan conditions (e.g., excitation RF profile, flip angle, and spatial presaturation pulse) for their optimal image quality....

The purpose of the study is to examine whether, among patients who visited hospitals and underwent brain MRI or MRA scan tests, there was a relationship between the existence of clinically significant abnormal findings and the relevance of primary care physicians' referrals. A case-control study was carried out at six teaching hospitals in Japan. We identified cases with significant abnormal MR...

BACKGROUND AND PURPOSE There is need to improve image acquisition speed for MR imaging in evaluation of patients with acute ischemic stroke. The purpose of this study was to evaluate the feasibility of a 3T MR stroke protocol that combines low-dose contrast-enhanced MRA and dynamic susceptibility contrast perfusion, without additional contrast. METHODS Thirty patients with acute stroke who un...

BACKGROUND AND PURPOSE Contrast angiography (CA) is the reference examination for the diagnosis of cerebral arterial abnormality, but this procedure is invasive. In childhood, ischemic strokes are being increasingly investigated by means of MRI, including MR angiography (MRA). Very few data are available about the accuracy of MRA compared with CA in the specific context of acute pediatric strok...

Cerebrovascular complications are frequent events in children with sickle cell disease, yet routinely used techniques such as Transcranial Doppler (TCD), Magnetic Resonance (MRI) and Angiography (MRA), insufficiently explain the cause of poor cognitive performances. Forty children with SS-Sβ° (mean age 8 years) underwent neurocognitive evaluation and comprehensive brain imaging assessment with ...

Stroke triggers a local and systemic inflammatory response leading to the production of cytokines that can influence blood vessel reactivity. In this study, we aimed to assess whether cerebral ischemia/reperfusion could affect vasoconstriction and vasodilatation on mesenteric resistance arteries (MRA) from Wistar Kyoto rats. The right middle cerebral artery was occluded (90 min) and reperfused ...

PURPOSE Basiparallel anatomic scanning (BPAS)-MR imaging is a simple MR imaging technique that we designed for visualization of the surface appearance of the vertebrobasilar artery within the cistern. It can clearly show the outer contour of occluded arteries or thrombosed aneurysms. By comparing BPAS-MR imaging with 3D time-of-flight (TOF) MR angiography (MRA), we can precisely evaluate the ve...