Rotary Scanning Acquisition in Ultra-Low-Field MRI

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2016
Major/Subject
Mcode
Degree programme
Language
en
Pages
2255-2264
Series
Magnetic Resonance in Medicine, Volume 75, issue 6
Abstract
Purpose: To develop a method of achieving large field of view (FOV) imaging with a smaller amount of data in ultra-low-field (ULF) MRI. Theory: In rotary scanning acquisition (RSA), data from the imaging object is acquired at multiple angles by rotating the object or the scanner. RSA is similar to radial-trajectory acquisition but simplifies the measurement and image reconstruction when concomitant fields are nonnegligible. Methods: RSA was implemented to achieve large FOV with only three localized superconductive quantum interference device (SQUID) sensors at the ULF-MRI field of 50 mT. Results: Simulations suggest benefits of RSA, including reduced concomitant field artifacts, lar ge FOV imaging, and SNR improvement. Experimental data demonstrate the feasibility of reconstructing lar ge FOV images using only three SQUID sensors with 33% of the amount of data collected using a Cartesian trajectory. Conclusion: RSA can be useful in low-field, low-weight, orportable MRI to generate large FOV images with only a few sensors.
Description
| openaire: EC/H2020/686865/EU//BREAKBEN
Keywords
RSA, radial trajectory, rotation, SENSE, ULF MRI, concomitant effect, SNR
Other note
Citation
Hsu , Y-C , Zevenhoven , K C J , Chu , Y-H , Dabek , J , Ilmoniemi , R J & Lin , F-H 2016 , ' Rotary Scanning Acquisition in Ultra-Low-Field MRI ' , Magnetic Resonance in Medicine , vol. 75 , no. 6 , 75 , pp. 2255-2264 . https://doi.org/10.1002/mrm.25676