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

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

doi:10.1002/mrm.27779

Cited by 4 publications

(9 citation statements)

References 30 publications

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“…Recently, RT speech MRI has been performed at a broad range of field strengths from 0.55T to 3T with adequate image quality. The proposed method could be particularly useful at low field strengths where both muscle T 1 is shorter and the baseline signal‐to‐noise ratio is lower.…”

Section: Discussionmentioning

confidence: 99%

Improved real‐time tagged MRI using REALTAG

Chen

Lee

Byrd

et al. 2019

Magnetic Resonance in Med

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Objectives:To evaluate a novel method for real-time tagged MRI with increased tag persistence using phase sensitive tagging (REALTAG), demonstrated for speech imaging. Methods: Tagging is applied as a brief interruption to a continuous real-time spiral acquisition. REALTAG is implemented using a total tagging flip angle of 180° and a novel frame-by-frame phase sensitive reconstruction to remove smooth background phase while preserving the sign of the tag lines. Tag contrast-to-noise ratio of REALTAG and conventional tagging (total flip angle of 90°) is simulated and evaluated in vivo. The ability to extend tag persistence is tested during the production of vowel-to-vowel transitions by American English speakers. Results: REALTAG resulted in a doubling of contrast-to-noise ratio at each time point and increased tag persistence by more than 1.9-fold. The tag persistence was 1150 ms with contrast-to-noise ratio >6 at 1.5T, providing 2 mm in-plane resolution, 179 frames/s, with 72.6 ms temporal window width, and phase sensitive reconstruction. The new imaging window is able to capture internal tongue deformation over word-to-word transitions in natural speech production. Conclusion: Tag persistence is substantially increased in intermittently tagged realtime MRI by using the improved REALTAG method. This makes it possible to capture longer motion patterns in the tongue, such as cross-word vowel-to-vowel transitions, and provides a powerful new window to study tongue biomechanics.

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Section: Discussionmentioning

confidence: 99%

Improved real‐time tagged MRI using REALTAG

Chen

Lee

Byrd

et al. 2019

Magnetic Resonance in Med

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“…Current state‐of‐the‐art techniques use non‐Cartesian sampling (radial or spiral acquisition) and parallel imaging, combined with constrained reconstruction. This has enabled 2D dynamic images with spatial resolutions of 1.3–2.4 mm 2 at high temporal resolutions of 10–60 msec (100 to 17 fps) from highly undersampled MRI data 11,54,55,143,156–159 . Imaging the 2D mid‐sagittal plane is the most widely used, as it is most informative thanks to its entire vocal tract coverage from the lips to the glottis given a high temporal resolution.…”

Section: Applicationsmentioning

confidence: 99%

Real‐Time Magnetic Resonance Imaging

Nayak

Lim

Campbell-Washburn

et al. 2020

Magnetic Resonance Imaging

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Real‐time magnetic resonance imaging (RT‐MRI) allows for imaging dynamic processes as they occur, without relying on any repetition or synchronization. This is made possible by modern MRI technology such as fast‐switching gradients and parallel imaging. It is compatible with many (but not all) MRI sequences, including spoiled gradient echo, balanced steady‐state free precession, and single‐shot rapid acquisition with relaxation enhancement. RT‐MRI has earned an important role in both diagnostic imaging and image guidance of invasive procedures. Its unique diagnostic value is prominent in areas of the body that undergo substantial and often irregular motion, such as the heart, gastrointestinal system, upper airway vocal tract, and joints. Its value in interventional procedure guidance is prominent for procedures that require multiple forms of soft‐tissue contrast, as well as flow information. In this review, we discuss the history of RT‐MRI, fundamental tradeoffs, enabling technology, established applications, and current trends. Level of Evidence 5 Technical Efficacy Stage 1

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“…For a more advanced testing of future numerical simulations, more advanced parallel imaging techniques, such as radial and spiral GRAPPA and SENSE, would be another logical extension. Time parallel imaging techniques, where kernels are calculated not only from all coils but also across adjacent sampling times [ 111 , 112 ], would also be a valid extension to this model as they have started to be used in speech MRI [ 64 , 66 ].…”

Section: Conclusion and Possible Directions For Future Workmentioning

confidence: 99%

“…GRAPPA reconstruction is performed in k-space; the non-sampled portions of k-space are estimated using the surrounding k-space data. Those techniques are available commercially on MRI scanners and both SENSE (e.g., [39,47,51]) and GRAPPA (e.g., [13,[64][65][66]) have successfully been applied to vocal tract imaging.…”

Section: Overview Of Dynamic and Rtmri: Sequences And Acquisition Strategiesmentioning

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

Cited by 4 publications

References 30 publications

Improved real‐time tagged MRI using REALTAG

Improved real‐time tagged MRI using REALTAG

Real‐Time Magnetic Resonance Imaging

Realistic Dynamic Numerical Phantom for MRI of the Upper Vocal Tract

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