Faster dynamic imaging of speech with field inhomogeneity corrected spiral fast low angle shot (FLASH) at 3 T

Bradley P. Sutton, Charles A. Conway, Youkyung Bae, Ravi Seethamraju, David P. Kuehn

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose To evaluate the impact of magnetic field inhomogeneity correction on achievable imaging speeds for magnetic resonance imaging (MRI) of articulating oropharyngeal structures during speech and to determine if sufficient acquisition speed is available for visualizing speech structures with real-time MRI. Materials and Methods We designed a spiral fast low angle shot (FLASH) sequence that combines several acquisition techniques with an advanced image reconstruction approach that includes magnetic field inhomogeneity correction. A simulation study was performed to examine the interaction between imaging speed, image quality, number of spiral shots, and field inhomogeneity correction. Six volunteer subjects were scanned to demonstrate adequate visualization of articulating structures during simple speech samples. Results The simulation study confirmed that magnetic field inhomogeneity correction improves the available tradeoff between image quality and speed. Our optimized sequence co-acquires magnetic field maps for image correction and achieves a dynamic imaging rate of 21.4 frames per second, significantly faster than previous studies. Improved visualization of anatomical structures, such as the soft palate, was also seen from the field-corrected reconstructions in data acquired on volunteer subjects producing simple speech samples. Conclusion Adequate temporal resolution of articulating oropharyngeal structures during speech can be obtained by combining outer volume suppression, multishot spiral imaging, and magnetic field corrected image reconstruction. Correcting for the large, dynamic magnetic field variation in the oropharyngeal cavity improves image quality and allows for higher temporal resolution.

Original languageEnglish (US)
Pages (from-to)1228-1237
Number of pages10
JournalJournal of Magnetic Resonance Imaging
Volume32
Issue number5
DOIs
StatePublished - Nov 2010

Keywords

  • dynamic MRI
  • magnetic susceptibility
  • speech imaging

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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