Introduction Three dimensional Contrast-enhanced MR Angiography (3D CE-MRA) has become an accepted technique for vascular imaging particularly in the abdomen, thorax and extremities. This technique can provide 3D angiograms of excellent contrast and minimize flow-related artifacts. However, quantitative 3D morphological information on vessels cannot be easily obtained by simple visualization to...

The pathophysiologic role of hemodynamic alteration to peripheral vessels in Moyamoya angiopathy and the formation of microaneurysms remains unclear. The purpose of this study was to investigate microaneurysms in collateral Moyamoya vessels by using 7T ultra-high-field MR imaging. Ten patients with Moyamoya disease were evaluated with TOF-MRA at 7T acquired with 0.22 × 0.22 × 0.41 mm(3) resolut...

Introduction A newly introduced compatible dual-echo arteriovenography (CODEA) is a technique for simultaneous acquisition of time-of-flight (TOF) MR angiogram (MRA) and blood oxygenation level-dependent (BOLD) MR venogram (MRV). The technique improved the previous dual-echo MRA/MRV technique (1), by maximally separating the K-space center regions for the two echoes achieved through an echo-spe...

Protocol The article by Naggara et al on the added value of high-resolution MR imaging in the diagnosis of vertebral artery dissection shows an interesting comparison between routine clinical MR imaging examinations as performed in their institution and high-resolution imaging acquired with dedicated coils and different techniques. The study enhances the difficult diagnostic task of demonstrati...

BACKGROUND Carotid intraplaque hemorrhage (IPH) and lipid rich necrotic core (LRNC) have been associated with accelerated plaque growth, luminal narrowing, future surface disruption and development of symptomatic events. The aim of this study was to evaluate the quantitative relationships between high intensity signals (HIS) in the plaque on TOF-MRA and IPH or LRNC volumes as measured by multic...

PURPOSE The in-stent signal reduction of the stented artery caused by susceptibility artifact or radiofrequency shielding artifact limited the use of time-of-flight MR angiography (TOF-MRA) as a follow-up tool after intracranial stenting. We showed the degree of an artifact according to different stent types, and optimized MR parameters for TOF-MRA in patients with intracranial stent on 3.0 T M...

PURPOSE To evaluate the accuracy of magnetic resonance angiography (MRA) for preoperative mapping of rectus and gluteal muscle perforating arteries prior to autologous flap breast reconstruction. MATERIALS AND METHODS Preoperative MRA on 25 consecutive patients undergoing perforator artery-based autologous breast reconstruction was performed at 1.5 T using 3D liver accelerate volume acquisiti...

In this paper we present an automatic statistical intensity basedapproach for extracting the 3D cerebrovascular system from time-of-flight (TOF) magnetic resonance angiography (MRA) data. The voxels of the dataset are classified as either background tissues, which are modeled by a finite mixture of one Rayleigh and two normal distributions, or blood vessels, which are modeled by one normal dist...

Background To determine hemodynamic parameters from 4D flow MRI, vessel boundaries are typically depicted by calculating a 3D phase contrast MR angiogram (PC-MRA) from 4D flow magnitude and flow images. However, this approach is limited by 1) low blood-tissue contrast of the magnitude images and 2) velocity weighting of PC-MRA may not fully depict areas of slow or swirling (vortex) flow. As a r...