Clinical estimation of 3D-TOF MRA use MTC and Ramped RF
نویسندگان
چکیده
منابع مشابه
Design of ramped RF excitation pulses with built-in out of slab saturation for 3D - TOF angiography
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...
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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...
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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...
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In this paper, we propose a novel kind of RF fingerprints (RFF) with better discriminability than typical RFF for identifying preamble-based wireless transmitters. First, the equivalent model of RFF identification system is built. Then, the typical RFF are analyzed with the built model and the novel RFF, which is transformed from preamble signal when its power is ramped up, is presented. Finall...
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 ...
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ژورنال
عنوان ژورنال: Japanese Journal of Radiological Technology
سال: 1995
ISSN: 0369-4305,1881-4883
DOI: 10.6009/jjrt.kj00001352665