Realistic Dynamic Numerical Phantom for MRI of the Upper Vocal Tract
| Autor: | Redha Boubertakh, Matthieu Ruthven, Marc E. Miquel, Joe Martin |
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| Rok vydání: | 2020 |
| Předmět: |
Image Series
Scanner Computer science speech phantoms real-time lcsh:Computer applications to medicine. Medical informatics upper vocal tract lcsh:QA75.5-76.95 Imaging phantom Article 030218 nuclear medicine & medical imaging numerical simulations 03 medical and health sciences 0302 clinical medicine Sampling (signal processing) Radiology Nuclear Medicine and imaging Segmentation Computer vision lcsh:Photography Electrical and Electronic Engineering Cardiac imaging business.industry lcsh:TR1-1050 Frame rate Computer Graphics and Computer-Aided Design Temporal resolution lcsh:R858-859.7 lcsh:Electronic computers. Computer science Computer Vision and Pattern Recognition Artificial intelligence business 030217 neurology & neurosurgery MRI |
| Zdroj: | Journal of Imaging Volume 6 Issue 9 Journal of Imaging, Vol 6, Iss 86, p 86 (2020) |
| ISSN: | 2313-433X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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