Clinical estimation of Fast 3D-TOF MRA use MTC
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چکیده
منابع مشابه
Optimization of MR Parameters of 3D TOF-MRA for Various Intracranial Stents at 3.0T MRI
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...
متن کامل3D TOF MRA of the intracranial arteries: effects of increasing magnetic field to 4.7T
A. Eissa, A. Wilman Biomedical Engineering, University of Alberta, Edmonton, AB, Canada INTRODUCTION TOF MRA has been successful at 3T (1,2) largely due to the increases in SNR and T1 relaxation times. The higher SNR at higher fields allows for higher resolution. The increase in T1 values will also allow for higher background suppression. However, increasing field also suffers from increasing R...
متن کاملAutomatische Segmentierung der zerebralen Gefäße aus 3D-TOF-MRA-Bildsequenzen mittels Fuzzy-Methoden
Kurzfassung. Im Rahmen dieses Beitrages wird eine automatische Methode zur Extraktion des zerebralen Gefäßsystems aus 3D-Time-of-Flight (TOF)-MRA-Bildsequenzen vorgestellt. Hierbei wird zunächst in einem Vorverarbeitungsschritt das Gehirn von den nicht-zerebralen Gewebeklassen befreit. In einem weiteren Schritt wird aus dem TOF-Datensatz ein Vesselnessund Maximum-Parameterbild berechnet. Diese ...
متن کاملStatistical-Based Approach for Extracting 3D Blood Vessels from TOF-MRA Data
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...
متن کاملTOF-MRA using multi-oblique-stack acquisition (MOSA).
PURPOSE To alleviate the intrinsic limitation of current time-of-flight magnetic resonance angiography (TOF-MRA) techniques, which are insensitive to in-plane blood flow due to the flow saturation effect. MATERIALS AND METHODS A multi-oblique-stack acquisition (MOSA) technique was proposed in this study to tackle this TOF problem by acquiring two or more TOF image stacks bearing different ori...
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ژورنال
عنوان ژورنال: Japanese Journal of Radiological Technology
سال: 1995
ISSN: 0369-4305,1881-4883
DOI: 10.6009/jjrt.kj00001352664