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Near‐silent distortionless DWI using magnetization‐prepared RUFIS.

Authors :
Yuan, Jianmin
Hu, Yuxin
Menini, Anne
Sandino, Christopher M.
Sandberg, Jesse
Sheth, Vipul
Moran, Catherine J.
Alley, Marcus
Lustig, Michael
Hargreaves, Brian
Vasanawala, Shreyas
Source :
Magnetic Resonance in Medicine; Jul2020, Vol. 84 Issue 1, p170-181, 12p
Publication Year :
2020

Abstract

Purpose: To develop a near‐silent and distortionless DWI (sd‐DWI) sequence using magnetization‐prepared rotating ultrafast imaging sequence. Methods: A rotating ultrafast imaging sequence was modified with driven‐equilibrium diffusion preparation, including eddy‐current compensation methods. To compensate for the T1 recovery during readout, a phase‐cycling method was used. Both compensation methods were validated in phantoms. The optimized sequence was compared with an EPI diffusion sequence for image distortion, contrast, ADC, and acoustic noise level in phantoms. The sequence was evaluated in 1 brain volunteer, 5 prostate volunteers, and 10 pediatric patients with joint diseases. Results: Combination of several eddy‐current compensation methods reduced the artifact to an acceptable level. Phase cycling reduced T1 recovery contamination during readout. In phantom scans, the optimized sequence generated similar image contrast to the EPI diffusion sequence, and ADC maps between the sequences were comparable; sd‐DWI had significantly lower acoustic noise (P <.05). In vivo brain scan showed reduced image distortion in sd‐DWI compared with the EPI diffusion, although residual motion artifact remains due to brain pulsation. The prostate scans showed that sd‐DWI can provide similar ADC compared with EPI diffusion, with no image distortion. Patient scans showed that the sequence can clearly depict joint lesions. Conclusion: An sd‐DWI sequence was developed and optimized. Compared with conventional EPI diffusion, sd‐DWI provided similar diffusion contrast, accurate ADC measurement, improved image quality, and minimal ambient scanning noise. The sequence showed the ability to obtain in vivo diffusion contrast in relatively motion‐free body regions, such as prostate and joint. [ABSTRACT FROM AUTHOR]

Subjects

Subjects :
NOISE
JOINT diseases

Details

Language :
English
ISSN :
07403194
Volume :
84
Issue :
1
Database :
Complementary Index
Journal :
Magnetic Resonance in Medicine
Publication Type :
Academic Journal
Accession number :
142336999
Full Text :
https://doi.org/10.1002/mrm.28106