Dynamic imaging of swallowing in a seated position using open‐configuration MRI

Honda, Yasutoshi; Hata, Nobuhiko

doi:10.1002/jmri.20992

Cited by 38 publications

(33 citation statements)

References 12 publications

(15 reference statements)

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“…Although most clinical practice still utilizes traditional imaging methods (videofluoroscopy), some authors have proposed the use of MRI for clinical use in assessing the oropharyngeal stages of swallowing. Upright MRI scanners have been proposed by some [26]; however, these are not as readily available as traditional scanners requiring a prone or supine position. Utilization of highspeed imaging sequences have enabled near real-time visualization of the process of swallowing [27][28][29].…”

Section: Limitations Of the Study And Future Researchmentioning

confidence: 99%

Effect of Posture on Deglutitive Biomechanics in Healthy Individuals

2011

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The purpose of this study was to assess displacement of oropharyngeal structures, particularly the hyoid bone and velum, and variations in timing of the pharyngeal stage of swallowing in the upright versus the supine position. Twelve Caucasian adult subjects between 19 and 27 years of age participated. Subjects were recorded swallowing 7 cc of liquid barium in the upright and supine positions. The hyoid bone had a significantly greater amount of anterior displacement while in the supine position compared to that of the upright position (p< 0.01). While in the upright position, the velum comes to a fully elevated position at nearly the same time as the initiation of the pharyngeal swallow (within an average of 27 ms of each other), whereas in the supine position the velum continues to elevate on average 115 ms after the initiation of the pharyngeal swallow. Results indicated a significant difference (p < 0.05) in the amount of velar movement from rest to the fully elevated position between the upright and supine positions for female subjects. The results from the study demonstrate variations in hyoid displacement, velar movement, and bolus movement through the pharynx with respect to the two body positions and the subjects' gender.

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Section: Limitations Of the Study And Future Researchmentioning

confidence: 99%

Effect of Posture on Deglutitive Biomechanics in Healthy Individuals

2011

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“…For all these applications, suitable MR techniques are now in place (e.g. Ciobanu et al, 2003;Manz et al, 2003;Müller et al, 2006;Lee et al, 2006Lee et al, , 2007Honda and Hata, 2007). This versatility of MR techniques, along with their non-invasiveness, renders them a very promising tool for such comparative investigations (e.g.…”

Section: Perspectives For Fossil Mrimentioning

confidence: 99%

Three-dimensional Magnetic Resonance Imaging of fossils across taxa

Mietchen

Aberhan²,

Manz

et al. 2008

Biogeosciences

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Abstract. The frequency of life forms in the fossil record is largely determined by the extent to which they were mineralised at the time of their death. In addition to mineral structures, many fossils nonetheless contain detectable amounts of residual water or organic molecules, the analysis of which has become an integral part of current palaeontological research. The methods available for this sort of investigations, though, typically require dissolution or ionisation of the fossil sample or parts thereof, which is an issue with rare taxa and outstanding materials like pathological or type specimens. In such cases, non-destructive techniques could provide a valuable methodological alternative. While Computed Tomography has long been used to study palaeontological specimens, a number of complementary approaches have recently gained ground. These include Magnetic Resonance Imaging (MRI) which had previously been employed to obtain three-dimensional images of pathological belemnites non-invasively on the basis of intrinsic contrast. The present study was undertaken to investigate whether 1 H MRI can likewise provide anatomical information about nonpathological belemnites and specimens of other fossil taxa. To this end, three-dimensional MR image series were acquired from intact non-pathological invertebrate, vertebrate and plant fossils. At routine voxel resolutions in the range of several dozens to some hundreds of micrometers, these images reveal a host of anatomical details and thus highlight the potential of MR techniques to effectively complement existing methodological approaches for palaeontological investigations in a wide range of taxa. As for the origin of the MR signal, relaxation and diffusion measurements as well as 1 H and 13 C MR spectra acquired from a belemnite suggest intracrystalline water or hydroxyl groups, rather than organic residues.

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“…These MRI-based swallowing studies were performed with subjects in the supine position, and kinematic analysis involved only midsagittal images. When 0.5-T open-type MRI systems are used, the study can be performed with the subject in the sitting position but the spatial and temporal resolution is limited due to the lower magnetic field strength [14]. Although MRI does not expose the subject to X-rays, extreme caution is required because of the strong magnetic field generated.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Swallowing Using 320-Detector-Row Multislice CT. Part I: Single- and Multiphase Volume Scanning for Three-dimensional Morphological and Kinematic Analysis

et al. 2010

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A 320-detector-row multislice computed tomography (320-MSCT) scanner can acquire a volume data set covering a maximum range of 16 cm and can generate axial images 0.5-mm thick at 0.5-mm intervals. Three-dimensional (3D) images reconstructed from the thin axial slices include multiplanar reconstruction and 3D-CT. Single-phase 3D images are reconstructed from 0.175-s data, and multiphase 3D images are created in 29 phases at intervals of 0.1 s. Continuous replay of these 3D images produces four-dimensional moving images. In order to determine the feasibility of the morphologic and kinematic analyses of swallowing using 320-MSCT, single-phase volume scanning was performed on three patients and multiphase volume scanning was performed on one healthy volunteer. The single-phase 3D images clearly and accurately showed the structures involved in swallowing, and the multiphase 3D images were able to show the oral stage to the early esophageal stage of swallowing, allowing a kinematic analysis of swallowing. We developed a reclining chair that allows scanning to be performed with the subject in a semisitting position, which makes swallowing evaluation by 320-MSCT applicable not only to research on healthy swallowing but also to the clinical examination of dysphagia patients.

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Dynamic imaging of swallowing in a seated position using open‐configuration MRI

Cited by 38 publications

References 12 publications

Effect of Posture on Deglutitive Biomechanics in Healthy Individuals

Effect of Posture on Deglutitive Biomechanics in Healthy Individuals

Three-dimensional Magnetic Resonance Imaging of fossils across taxa

Evaluation of Swallowing Using 320-Detector-Row Multislice CT. Part I: Single- and Multiphase Volume Scanning for Three-dimensional Morphological and Kinematic Analysis

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