Magnetic resonance angiography (MRA) can provide significant additional information to complement the routine spin-echo MR examination of the brain." The idea of a combined study has gained favor because it provides a noninvasive alternative for the complete study of patients with suspected cerebrovascular disease. Because of the relatively short time of acquisition, MRA sequences can be easify...

PURPOSE The distal dural ring (DDR) is an anatomical landmark used to distinguish intra- and extradural aneurysms. We investigated identification of the DDR using 2 three-dimensional (3D) magnetic resonance (MR) cisternography sequences--3D constructive interference in steady state (CISS) and 3D sampling perfection with application optimized contrasts using different flip angle evolutions (SPAC...

Traumatic intracranial pseudoaneurysms occurring after blunt head injuries are rare. We report an unusual case of subarachnoid hemorrhage (SAH) caused by rupturing of the traumatic pseudoaneurysm of the internal carotid artery (ICA) bifurcation that resulted from a non-penetrating injury. In a patient with severe headache and SAH in the right sylvian cistern, which developed within 7 days after...

For the purpose of visualizing low-flow as well as high-flow blood vessels without using contrast agents, we propose a new technique called a hybrid of opposite-contrast MR angiography (HOP-MRA). HOP-MRA is a combination of standard time-of-flight (TOF) using a full first-order velocity-compensation for white-blood (WB) and flow-sensitive black-blood (FSBB) techniques, which use motion-probing ...

Methods Thirteen female New Zealand White rabbits were randomized to receive either intramuscular sham injection (n=4), empty capsules (n=4) or microencapsulated MSCs (n=5) in the medial thigh 24h after endovascular occlusion of the left superficial femoral artery (SFA). Three-dimensional (3D) TOF MRA acquired in the axial plane (3T Trio Siemens, 30ms TR; 3.69ms TE; 0.6×0.4×0.6mm voxel size), 3...

In this paper an automatic fuzzy based method for the extraction of the cerebrovascular system from 3D Time-of-Flight (TOF) MRA image sequences is presented. In order to exclude non-brain tissue an automatic skull stripping method is applied in a preprocessing step. Based on the TOF images vesselness and maximum parameter images are computed first. These parameter images are then combined with ...

BACKGROUND AND PURPOSE Our aim was to evaluate the usefulness of 3-dimensional time-of-flight magnetic resonance angiography (3-D TOF MRA) in detection and quantification of mild atherosclerotic changes of carotid arteries with reference to intravascular ultrasound (IVUS) and contrast angiography. METHODS TOF MRA at 1.5 T, IVUS, and selective digital subtraction angiography were performed on ...

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 [CE-MRA]) and postproc...

BACKGROUND AND PURPOSE Carotid IPH can be detected with MR imaging. The aim of this study was to determine the safety of CAS using an emboli protection device in patients with severe carotid artery stenosis and MR imaging-depicted carotid IPH. MATERIALS AND METHODS We retrospectively reviewed a prospective data base that included 91 consecutive patients with severe carotid stenosis and high-r...