منابع مشابه
Magnetic resonance imaging and cardiac pacemaker safety at 1.5-Tesla.
OBJECTIVES The study was done to determine whether patients with pacemakers could safely undergo magnetic resonance imaging (MRI) at 1.5-Tesla (T). BACKGROUND Because of theoretical risks, it is an absolute contraindication for a patient with a pacemaker to undergo MRI. However, there are times when an MRI is needed to provide valuable clinical information. METHODS Fifty-four patients under...
متن کاملReal-time cardiac MRI at 3 tesla.
Real-time cardiac and coronary MRI at 1.5T is relatively "signal starved" and the 3T platform is attractive for its immediate factor of two increase in magnetization. Cardiac imaging at 3T, however, is both subtly and significantly different from imaging at 1.5T because of increased susceptibility artifacts, differences in tissue relaxation, and RF homogeneity issues. New RF excitation and puls...
متن کاملFunctional diffusion tensor imaging at 3 Tesla
In a previous study we reported on a non-invasive functional diffusion tensor imaging (fDTI) method to measure neuronal signals directly from subtle changes in fractional anisotropy along white matter tracts. We hypothesized that these fractional anisotropy changes relate to morphological changes of glial cells induced by axonal activity. In the present study we set out to replicate the results...
متن کاملReal-Time Imaging at 3 Tesla
Introduction Modern real-time MRI (RT-MRI) involves the continuous acquisition, reconstruction, and display of images with 1) minimal acquisition time per image (usually < 100 ms) and 2) minimal acquisition-to-display latency (usually < 300 ms). It allows one to capture dynamic processes as they happen without the need for gating, breath-holding, or patient cooperation [1, 2], and has been made...
متن کاملWaveguide Magnetic Resonance Imaging at 3 Tesla
Introduction. Waveguides have been successfully used to generate magnetic resonance images at 7 Tesla for whole-body systems [1]. From these results, it has been established that waveguides are only suitable for 7T systems with wide bores of al least 60 cm. This is mainly due to the cut-off frequency of the cylindrical waveguides used. To overcome this limitation a parallel-plate waveguide was ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2001
ISSN: 0740-3194,1522-2594
DOI: 10.1002/1522-2594(200101)45:1<176::aid-mrm1025>3.0.co;2-e