منابع مشابه
Design of Archimedean and Logarithmic Spiral K-Space Trajectories
Purpose Spiral k-space trajectories allow for rapid data acquisition, leading to reduced motion artifacts, and facilitating the imaging of dynamic objects. The spiral trajectory is effective in coronary artery imaging (1). Either numerical (2) or approximate analytic (3) methods were used to calculate the sampling of the trajectory. Improved performance was observed with variable density spiral...
متن کاملSpiral SENSE: Sensitivity Encoding with arbitrary K-space Trajectories
Introduction Recently, sensitivity encoding with coil arrays has been discussed as a means of reducing acquisition time in standard Fourier imaging. The SENSE concept (1) combines reduced gradient encoding with the consideration of spatially distinct receiver sensitivities for signal localization. With rectilinear sampling patterns in k-space image reconstruction from sensitivity encoded data m...
متن کاملFast Frequency Selective Keyhole MRI using Optimized K-Space Trajectories
We present a new Fast Frequency Selective Keyhole (FFSK) method, which allows dynamic acquisition of a low-resolution image signal from the arbitrarily chosen k-space points and reduces acquisition time of the conventional keyhole approach. Off-resonance components are eliminated by the filtering procedure which substantialy increase SNR. The effect of the FFSK method on contrast in dynamic MRI...
متن کاملRetrospectively gated intra-cardiac 4D flow CMR using spiral k-space trajectories
Background Time-resolved three-dimensional phase contrast CMR (4D flow) is a powerful tool for hemodynamic assessment in the cardiovascular system. However, long scan times have hindered the application of the method in many cases. By using spiral readout trajectories, improved efficiency provides a means of reducing scan times without decreasing SNR. Furthermore, spiral acquisition offers incr...
متن کاملMulti echo spiral imaging : Optimized k-space trajectories for T2* quantification
Introduction Effective and theoretical k-space trajectories differ due to eddy currents or gradient hardware imperfections. This is especially critical in fast imaging techniques using high gradient slew rates and amplitudes, with possibly complex k-space acquisition schemes (e.g. spiral, twisted projection). Although k-space trajectory calibration can be used to avoid distortions in reconstruc...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 2009
ISSN: 0740-3194
DOI: 10.1002/mrm.21813