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Measuring tongue motion from tagged cine-MRI using harmonic phase (HARP) processinga)
a)A portion of this work was presented in the proceedings of 15th International Congress of Phonetic Sciences in a paper titled, “Tracking tongue motion from tagged magnetic resonance images using Harmonic Phase imaging (HARP-MRI).”
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Image of FIG. 1.
FIG. 1.

Images (a) and (b) form a pair of vertically tagged CSPAMM images with phase shifted tags, and (c) is the MICSR combination of images (a) and (b). Images (d) and (e) form a pair of horizontally tagged CSPAMM images and (f) is the MICSR combination of images (d) and (e). Intensity of MICSR images (c) and (f) have been thresholded for better visualization of the tags.

Image of FIG. 2.
FIG. 2.

(a) Horizontally tagged image produced by MICSR combination; (b) magnitude of its Fourier spectrum with the HARP bandpass filter; (c) harmonic magnitude image; and (d) harmonic phase image.

Image of FIG. 3.
FIG. 3.

Untagged image of one time frame of (a) coronal slice; (b) sagittal slice; (c) axial slice. White box shows region of interest around the tongue. (d) High-resolution static image of the anatomy to identify the muscle directions. White box shows a region of interest (ROI) around the tongue. The motion measures will be shown only for this ROI in order to avoid clutter of measurements in the surrounding tissues.

Image of FIG. 4.
FIG. 4.

(a) MICSR trinary display. (b) Overlay of MICSR checkerboard and untagged image; note the better edge definition near the tongue tip in the overlay image.

Image of FIG. 5.
FIG. 5.

Motion tracks for in a midsagittal slice. Black circles represent the position of the tissue point at time frame 1. The progression of shades from gray to black indicates the trajectory of the tissue point. In the electronic version, please zoom in more than 500% to see the trajectories clearly.

Image of FIG. 6.
FIG. 6.

(a) Genioglossus muscle directions delineated on high-resolution static MRI. (b) Lagrangian strain in the three lines of action of genioglossus.

Image of FIG. 7.
FIG. 7.

The first two columns show the principal strains at time frames 9 and 10, respectively; black denotes compression and gray denotes expansion. The third column shows the velocity of tissue points calculated between time frames 9 and 10. While the first row shows the measurements for a midsagittal slice, the second and third rows show the measurements for an anterior coronal slice and a superior axial slice, respectively.


Generic image for table

Articulation tabel for based on the shape of tongue and lips as seen in the untagged cine-MRI images.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Measuring tongue motion from tagged cine-MRI using harmonic phase (HARP) processinga)