منابع مشابه
Simple analytic spiral K-space algorithm.
The exact, hardware-constrained design of a spiral k-space trajectory requires the solution of a differential equation, thereby making real-time prescription difficult on scanners with limited computational power. This study describes a closed-form approximate solution for interleaved Archimedian spiral trajectories that closely matches the exact design. Both slew rate-limited and amplitude-lim...
متن کاملSimple analytic variable density spiral design.
Variable density spirals have been proposed in a variety of applications, including MR fluoroscopy, cardiac imaging, and MR spectroscopic imaging. In this work, a simple analytic solution for designing a flexible set of variable density spiral trajectory waveforms is presented. The method enables real-time waveform prescription on scanners with limited computational power. Both slew rate-limite...
متن کاملSimple Self-Gating for Compensation of Respiratory Motion using a Spiral k-Space Trajectory
Introduction: External respiratory monitoring is required for most MRI exams of the body and is typically achieved either through the use of a respiratory belt, which wraps around the torso and measures displacement of the chest/abdomen, or an 1D/2D navigator measurement. Whilst belts take some time to setup, can drift, and are on occasion not reliable enough (e.g. children or uncooperative pat...
متن کاملDesign 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...
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ژورنال
عنوان ژورنال: Magnetic Resonance in Medicine
سال: 1999
ISSN: 0740-3194,1522-2594
DOI: 10.1002/(sici)1522-2594(199908)42:2<412::aid-mrm25>3.0.co;2-u