Introduction It has been shown that the visibility of the vasculature in time-offlight (TOF) MR-angiography highly profits from increased field strengths [1-4]. To acquire truly arterial TOF data sets, the MR signal of venous blood is often saturated using spatially selective saturation pulses. Because of SAR limitations, the application of additional saturation pulses is often not possible at ...

PURPOSE We compared gross characterization of intracranial dural arteriovenous fistulas (DAVFs) between unenhanced 3-tesla 3-dimensional (3D) time-of-flight (TOF) magnetic resonance angiography (MRA) and digital subtraction angiography (DSA). METHODS We subjected 26 consecutive patients with intracranial DAVF to unenhanced 3T 3D TOF MRA and to DSA. Two independent sets of observers inspected ...

BACKGROUND AND PURPOSE We investigated the sensitivity of 3D-time-of flight (3D-TOF) magnetic resonance angiography (MRA) in the detection of cerebral aneurysms with the use of 3D digital subtraction angiography as the gold standard. We also evaluated the effects of location and number of aneurysms (and experience of the reader) on the sensitivity. METHODS 3D-TOF MRA was performed in 82 patie...

Background and Purpose—We investigated the sensitivity of 3D–time-of flight (3D-TOF) magnetic resonance angiography (MRA) in the detection of cerebral aneurysms with the use of 3D digital subtraction angiography as the gold standard. We also evaluated the effects of location and number of aneurysms (and experience of the reader) on the sensitivity. Methods—3D-TOF MRA was performed in 82 patient...

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...

This paper presents an extended version of the fully automated 3D cerebral vessel reconstruction algorithm developed by Wilson and Noble [11] which is applicable to time-of-flight (TOF) and phase contrast (PC) magnetic resonance angiography (MRA) images. We introduce a Rician distribution for background noise modelling and use a modified EM (Expectation-Maximisation) algorithm for the parameter...

Purpose: Is to evaluate the accuracy of fused 3D time-of-flight (TOF) MR angiography and Steady-State sequence (FIESTA) versus contrast-enhanced T1 weighted images in evaluation neurovascular compression via an inter-observer agreement protocol. Methods: Patients presented with trigeminal neuralgia, tinnitus, or facial hemispasm were examined using 3D-TOF-MRA, 3D-FIESTA, T1WI cerebellopontine a...

Introduction To enhance slower arterial flow as well as faster flow without increasing imaging time, we have proposed a new MRA technique named hybrid of opposite-contrast MRA (HOP-MRA) that combined standard TOF white-blood (WB) MRA with the flow-sensitive black-blood (FSBB) sequence, resulting in excellent visualization of slow-flow vessels, as compared to the MTC-TOF MRA technique [1,2]. How...

Introduction In MR angiography (MRA), techniques are mainly divided into contrast-enhanced MRA and non-contrast MRA. Various non-contrast MRA techniques are clinically useful and widely used in routine examinations, such as 3D TOF [1] in intracranial region, phase shift [2] for flow quantification, arterial spin labeling [3,4] in pulmonary vessels [5,6], and balanced SSFP [7] in bright blood ca...

BACKGROUND The aim of this study was to investigate duplication of the vertebral artery (VA) using three-dimensional time-of-flight (3D TOF) magnetic resonance angiography (MRA) in a large study population to further our understanding of vascular variations. MATERIAL AND METHODS A retrospective analysis of 3D TOF-MRA data in 12 826 cases was performed. The occurrence rate of VA duplication was ...