Real-time speech MRI: Commercial Cartesian and non-Cartesian sequences at 3T and feasibility of offline TGV reconstruction to visualise velopharyngeal motion

Freitas, Andreia C.; Ruthven, Matthieu; Boubertakh, Redha; Miquel, Marc E.

doi:10.1016/j.ejmp.2018.01.014

Cited by 11 publications

(12 citation statements)

References 20 publications

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“…Current state-of-the-art technique uses non-Cartesian sampling (radial or spiral acquisition) and parallel imaging, combined with constrained reconstruction. This has enabled 2D dynamic images with spatial resolutions of 1.3 to 2.4 mm 2 at high temporal resolutions of to ms (100 to fps) from highly under-sampled MRI data (11,54,55,145,(155)(156)(157)(158).…”

Section: Upper Airwaymentioning

confidence: 99%

Cardiac magnetic resonance assessment of central and peripheral vascular function in patients undergoing renal sympathetic denervation as predictor for blood pressure response

et al. 2018

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Section: Upper Airwaymentioning

confidence: 99%

Cardiac magnetic resonance assessment of central and peripheral vascular function in patients undergoing renal sympathetic denervation as predictor for blood pressure response

et al. 2018

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“…In this case, the reconstruction can occur on the scanner or completely off-line. The latter allows for more computer intensive reconstruction to be applied like iterative reconstructions (e.g., [ 39 , 40 , 41 ]) or for the user to use reconstructions methods where the frame rate can be adjusted post-acquisition, for example, using different sliding windows on the data (e.g., [ 42 , 43 , 44 ]).…”

Section: Introductionmentioning

confidence: 99%

Realistic Dynamic Numerical Phantom for MRI of the Upper Vocal Tract

et al. 2020

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Dynamic and real-time MRI (rtMRI) of human speech is an active field of research, with interest from both the linguistics and clinical communities. At present, different research groups are investigating a range of rtMRI acquisition and reconstruction approaches to visualise the speech organs. Similar to other moving organs, it is difficult to create a physical phantom of the speech organs to optimise these approaches; therefore, the optimisation requires extensive scanner access and imaging of volunteers. As previously demonstrated in cardiac imaging, realistic numerical phantoms can be useful tools for optimising rtMRI approaches and reduce reliance on scanner access and imaging volunteers. However, currently, no such speech rtMRI phantom exists. In this work, a numerical phantom for optimising speech rtMRI approaches was developed and tested on different reconstruction schemes. The novel phantom comprised a dynamic image series and corresponding k-space data of a single mid-sagittal slice with a temporal resolution of 30 frames per second (fps). The phantom was developed based on images of a volunteer acquired at a frame rate of 10 fps. The creation of the numerical phantom involved the following steps: image acquisition, image enhancement, segmentation, mask optimisation, through-time and spatial interpolation and finally the derived k-space phantom. The phantom was used to: (1) test different k-space sampling schemes (Cartesian, radial and spiral); (2) create lower frame rate acquisitions by simulating segmented k-space acquisitions; (3) simulate parallel imaging reconstructions (SENSE and GRAPPA). This demonstrated how such a numerical phantom could be used to optimise images and test multiple sampling strategies without extensive scanner access.

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“…Accelerated MRI data acquisition is required to image at the frame rates used in clinical speech assessment (15 fps or higher) while maintaining acceptable spatial resolutions and image quality. Dynamic speech MRI at frame rates of 15 fps or higher has been achieved by using non‐Cartesian k‐space sampling trajectories and/or parallel imaging to accelerate MRI data acquisition . Each non‐Cartesian trajectory has its advantages and disadvantages: while spiral trajectories sample k‐space more efficiently, radial trajectories are less susceptible to off‐resonance effects.…”

Section: Introductionmentioning

confidence: 99%

Application of radial GRAPPA techniques to single‐ and multislice dynamic speech MRI using a 16‐channel neurovascular coil

Ruthven

Freitas

Boubertakh

et al. 2019

Magnetic Resonance in Med

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Purpose: To investigate: (1) the feasibility of using through-time radial GeneRalized Autocalibrating Partially Parallel Acquisitions (rGRAPPA) and hybrid radial GRAPPA (h-rGRAPPA) in single-and multislice dynamic speech MRI; (2) whether single-slice dynamic speech MRI at a rate of 15 frames per second (fps) or higher and with adequate image quality can be achieved using these radial GRAPPA techniques. Methods: Seven healthy adult volunteers were imaged at 3T using a 16-channel neurovascular coil and 2 spoiled gradient echo sequences (radial trajectory, field of view = 192 × 192 mm 2 , acquired pixel size = 2.4 × 2.4 mm 2 ). One sequence imaged a single slice at 16.8 fps, the other imaged 2 interleaved slices at 7.8 fps per slice.Image sets were reconstructed using rGRAPPA and h-rGRAPPA, and their image quality was compared using the root mean square error, structural similarity index, and visual assessments. Results: Image quality deteriorated when fewer than 170 calibration frames were used in the rGRAPPA reconstruction. rGRAPPA image sets demonstrated: (1) in 97% of cases, a similar image quality to h-rGRAPPA image sets reconstructed using a k-space segment size of 4, (2) in 98% of cases, a better image quality than h-rGRAPPA image sets reconstructed using a k-space segment size of 32. Conclusion: This study confirmed: (1) the feasibility of using rGRAPPA and h-rGRAPPA in single-and multislice dynamic speech MRI, (2) that single-slice speech imaging at a frame rate higher than 15 fps and with adequate image quality can be achieved using these radial GRAPPA techniques. K E Y W O R D Sdynamic MRI, multislice, radial GRAPPA, speech, velum

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Real-time speech MRI: Commercial Cartesian and non-Cartesian sequences at 3T and feasibility of offline TGV reconstruction to visualise velopharyngeal motion

Cited by 11 publications

References 20 publications

Cardiac magnetic resonance assessment of central and peripheral vascular function in patients undergoing renal sympathetic denervation as predictor for blood pressure response

Cardiac magnetic resonance assessment of central and peripheral vascular function in patients undergoing renal sympathetic denervation as predictor for blood pressure response

Realistic Dynamic Numerical Phantom for MRI of the Upper Vocal Tract

Application of radial GRAPPA techniques to single‐ and multislice dynamic speech MRI using a 16‐channel neurovascular coil

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