Sound synchronization and motion compensated reconstruction for speech Cine MRI
Résumé
Dynamic imaging of the vocal tact is important for modeling speech
through the acoustic-articulatory relation. The average duration of each sound is
about 80ms. Movements of each articulator, in particular the tongue, should be
captured with sufficient precision. Current clinical techniques use X-ray video
fluoroscopy which involves ionizing radiation. Real-time MRI allows direct recording
of speech motion [1] but is intrinsically limited in terms of resolution and SNR.
Synchronization of MRI with an acoustic device is possible [2] but requires motion of
vocal system to be highly reproducible. In this work we propose an optimized setup
for achieving dynamic MRI of speech with high spatial and temporal resolution based
on a combination of: an MR-compatible acoustic device allowing simultaneous
recording of speech during MRI; and a retrospectively gated, motion-compensated
image reconstruction that can deal with the variability of the subject repeating the
same sentence over the acquisition.
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