Acceleration of MRI of the vocal tract provides additional insight into articulator modifications

Abstract

The results indicate that higher temporal resolution is a necessity to catch fast morphometric changes in the vocal tract.

Recommendations for real-time speech MRI

“…Reconstruction schemes from non-Cartesian trajectories are not commonly available on clinical scanners; however, many research sites have successfully developed on-the-fly reconstructions for non-Cartesian radial and spiral trajectories. 6,42,45,47,60,68,69 As described in the previous section, non-Cartesian sampling has advantages in terms of efficient time sampling compared to Cartesian trajectories, but may have additional artifacts due to magnetic field inhomogeneity.…”

Feasibility of through‐time spiral generalized autocalibrating partial parallel acquisition for low latency accelerated real‐time MRI of speech

“…RT-MRI is challenged by trade-offs between the achievable spatial resolution, temporal resolution, slice coverage, and signal to noise. Several rapid MRI methods based on non-Cartesian imaging, parallel imaging, and compressed sensing (CS) have been applied to improve the above trade-offs (10)(11)(12)(13)(14)(15)(16). The latency time, which is the time between acquisition of a set of raw data and reconstruction of the final image, is a useful criterion to classify the above methods to either on-the-fly or off-line methods.…”

“…Iterative CS methods that exploit spatiotemporal redundancies of dynamic images have demonstrated greater acceleration levels (>6-to 7-fold). These invoke constraints based on low-rank assumptions, transform sparsity, or both (11)(12)(13)(14)(15)(16)22). These have demonstrated improved spatiotemporal resolutions in 2D RT-MRI (up to 1.5-2.4 mm 2 and 10-33 ms/frame) and also more recently in 3D RT-MRI (frame rate of 166 frames/sec) (22).…”

Assessment of velopharyngeal function with dual‐planar high‐resolution real‐time spiral dynamic MRI

“…Parallel imaging and compressed sensing can also be used to improve resolution by exploiting spatial and temporal redundancies in the data. These methods can be used separately or combined . However, off‐resonance correction for spiral scanning when parallel and constrained reconstruction methods are used has not been well studied.…”