Fast multi-planar gradient echo MR imaging: impact of variation in pulse sequence parameters on image quality and artifacts

Magnetic Resonance Imaging
Tao Li, Scott A Mirowitz

Abstract

The purpose of this investigation was to quantitatively evaluate the practical impact of alteration of key imaging parameters on image quality and artifacts in fast multi-planar gradient echo (GRE) pulse sequences. These include multi-planar GRASS (MPGR) and fast multi-planar spoiled GRASS (FMPSPGR). We developed a composite phantom with different T(1) and T(2) values comprising the range of common biological tissues, which was also subjected to periodic motion in order to evaluate motion effects. Magnetic resonance imaging was performed on a GE Signa 1.5-T system. Experimental variations in key parameters included excitation flip angle (FL), echo time (TE), repetition time (TR), and receive bandwidth (BW). Quantitative analysis consisted of signal-to-noise-ratio (SNR) and contrast (CN), image nonuniformity (NU), full-width-at-half-maximum (FWHM) (i.e., blurring or geometric distortion), and ghosting ratio (GR). We found that flip angle, TE, and TR play particularly critical roles in determining image signal, homogeneity, and ghosting artifact with these sequences. Optimum clinical application of these pulse sequences requires careful attention to these imaging parameters and to their complex interactions.

References

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Citations

Jun 7, 2005·Magnetic Resonance Imaging Clinics of North America·Diego R MartinShahid M Hussain
Jan 24, 2008·AJR. American Journal of Roentgenology·Daniel Cornfeld, Jeffery Weinreb
Aug 6, 2014·International Journal of Geriatric Psychiatry·Simon BruntonAndrew Simmons
Nov 21, 2015·AJNR. American Journal of Neuroradiology·U D NagarajB M Kline-Fath
Oct 23, 2018·Nihon Hoshasen Gijutsu Gakkai zasshi·Asuka KobayashiIsao Muro

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