BACKGROUND AND PURPOSE Craniocervical artery dissection is the most common cause of ischemic stroke identified in young adults. For the diagnosis of craniocervical artery dissection, multisequence MR imaging is recommended but is time-consuming. Recently, investigators proposed a simultaneous noncontrast angiography and intraplaque hemorrhage imaging technique allowing simultaneous noncontrast ...

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 MRA) in detecting hemodynamically significa...

BACKGROUND AND PURPOSE High-resolution MR imaging is useful for diagnosis and preoperative planning in patients with NVC. Because high-field MR imaging promises higher SNR and resolution, the aim of this study was to determine the value of high-resolution 3D-CISS and 3D-TOF MRA at 3T compared with 1.5T in patients with NVC. MATERIALS AND METHODS Forty-seven patients with NVC, trigeminal neura...

BACKGROUND AND PURPOSE Visualization of the peripheral arteries on single-slab 3D time-of-flight (TOF) MR angiography (MRA) can reflect blood flow velocity. The velocity in the middle cerebral artery (MCA) may correlate with cerebrovascular reactivity (CVR) to acetazolamide, which can be used to assess hemodynamic impairment. The goal of this study was to compare the signal intensity of the MCA...

MR angiography is proposed as a safer and less expensive alternative to the reference standard, DSA, in the follow-up of intracranial aneurysms treated with endovascular coil occlusion. We performed a systematic review and meta-analysis to evaluate the accuracy of TOF-MRA and contrast-enhanced MRA in detecting residual flow in the follow-up of coiled intracranial aneurysms. Literature was revie...

INTRODUCTION – In clinical practice, imaging of the intracranial arteries, such as the Circle of Willis (CoW), is performed most frequently with 3D TOF angiography. This noninvasive technique uses a T1-weighted RF-spoiled gradient echo (SPGR) sequence, typically in conjuction with multiple overlapping slabs (MOTSA) and RF slab excitation pulses with ramped excitation profile (TONE) to reduce bl...

PURPOSE To evaluate the suitability of an improved version of an automatic segmentation method based on geodesic active regions (GAR) for segmenting cerebral vasculature with aneurysms from 3D x-ray reconstruction angiography (3DRA) and time of flight magnetic resonance angiography (TOF-MRA) images available in the clinical routine. METHODS Three aspects of the GAR method have been improved: ...

BACKGROUND AND PURPOSE Cerebral hyperperfusion syndrome is a potential complication of superficial temporal artery-MCA anastomosis for Moyamoya disease. In this study, we evaluated whether TOF-MRA could assess cerebral hyperperfusion syndrome after superficial temporal artery-MCA anastomosis for this disease. MATERIALS AND METHODS This retrospective study included patients with Moyamoya disea...

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...