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Magnetic resonance fast Fourier imaging
Author(s) -
Cuppen J. J. M.,
Groen J. P.,
Konijn J.
Publication year - 1986
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.595905
Subject(s) - k space , physics , fourier transform , nuclear magnetic resonance , acceleration , magnetic resonance imaging , sampling (signal processing) , signal (programming language) , trajectory , optics , noise (video) , data acquisition , modulation (music) , signal to noise ratio (imaging) , medical imaging , fourier analysis , computer science , acoustics , image (mathematics) , computer vision , artificial intelligence , medicine , classical mechanics , quantum mechanics , astronomy , detector , radiology , programming language , operating system
A new method for fast magnetic resonance imaging is presented. It provides a more rapid data acquisition than two‐dimensional Fourier imaging (2DFI) by a factor which may be chosen depending on the required signal‐to‐noise ratio of the image. In addition to the readout gradient of 2DFI, the present method employs an oscillating modulation gradient. In this way, a curved alternating trajectory in k space is sampled after each spin excitation. For a p ‐times accelerated data acquisition, the trajectory consists of p periods, where p is of the order of 2 to 8 for low‐frequency gradient modulation but can be chosen higher if certain hardware requirements are met. Adequate sampling density in k space is obtained by scanning shifted trajectories after subsequent spin excitations. The method can be combined with volume imaging (3DFI) and multiple slice 2DFI. It was implemented on a standard Philips Gyroscan system without any hardware modifications. Results obtained for an acceleration factor p =4 are shown.