Gradient-Modulated PETRA MRI

Tomography : a Journal for Imaging Research
Naoharu KobayashiMichael Garwood

Abstract

Image blurring due to off-resonance and fast T 2 * signal decay is a common issue in radial ultrashort echo time MRI sequences. One solution is to use a higher readout bandwidth, but this may be impractical for some techniques like pointwise encoding time reduction with radial acquisition (PETRA), which is a hybrid method of zero echo time and single point imaging techniques. Specifically, PETRA has severe specific absorption rate (SAR) and radiofrequency (RF) pulse peak power limitations when using higher bandwidths in human measurements. In this study, we introduce gradient modulation (GM) to PETRA to reduce image blurring artifacts while keeping SAR and RF peak power low. Tolerance of GM-PETRA to image blurring was evaluated in simulations and experiments by comparing with the conventional PETRA technique. We performed inner ear imaging of a healthy subject at 7T. GM-PETRA showed significantly less image blurring due to off-resonance and fast T2* signal decay compared to PETRA. In in vivo imaging, GM-PETRA nicely captured complex structures of the inner ear such as the cochlea and semicircular canals. Gradient modulation can improve the PETRA image quality and mitigate SAR and RF peak power limitations without special hardw...Continue Reading

Citations

Apr 22, 2016·Nihon Hoshasen Gijutsu Gakkai zasshi·Chie KikuchiYohei Yanagiya
Jan 30, 2019·Journal of Magnetic Resonance Imaging : JMRI·Azadeh SharafiRavinder R Regatte
Aug 31, 2019·AJNR. American Journal of Neuroradiology·A LuM-L Ho
Jun 28, 2017·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Hattie L RingMichael Garwood
Nov 30, 2019·Progress in Nuclear Magnetic Resonance Spectroscopy·Markus Weiger, Klaas P Pruessmann
Jun 4, 2021·Progress in Nuclear Magnetic Resonance Spectroscopy·Emil LjungbergFlorian Wiesinger
Jun 21, 2021·Seminars in Ultrasound, CT, and MR·Claudia F Kirsch, Mai-Lan Ho

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Software Mentioned

GM
CUDA
PETRA
ZTE

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