Kinetic MRI using high-speed sequence to evaluate swallowing

Honda, Yasutoshi

doi:10.1007/bf02493287

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…Deglutition consists of three stages: the oral phase, during which the bolus is propelled from the oral cavity into the pharynx by voluntary movements of the tongue; the pharyngeal phase, which starts with triggering of the swallowing reflex and ends with the closure of the upper pharyngeal sphincter; and the esophageal phase, in which the bolus is transported to the stomach [ 19 , 20 ]. The stages we analyzed represent the end of the oral phase of swallowing (stage 1), the beginning of the pharyngeal phase (stage 2), and the end of the pharyngeal phase (stage 3).…”

Section: Discussionmentioning

confidence: 99%

New application of dynamic magnetic resonance imaging for the assessment of deglutitive tongue movement

et al. 2018

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BackgroundDeglutitive motion of the tongue may function to maintain tooth position. However, the causation between abnormal patterns of orofacial muscle function and dental malocclusion remains unclear. To clarify the pathogenic mechanism of malocclusion, it is important to determine the relative positional relationship between the tongue tip and incisor edge or the dorsal tongue and palate during deglutition. Here, we assessed the utility of 3-T segmented cine-magnetic resonance (MR) imaging, combined with static MR images for hard tissue visualization, in assessing the relationship between the tongue and the surrounding tissues during deglutitive tongue movement.MethodsCine-MR images were acquired from three healthy female volunteers during deglutition who had no history of swallowing disorder or other chronic illness, normal alignment and occlusion, and a skeletal class I relationship. Three cine-MR images were taken during deglutition in accordance with an auditory cue for each volunteer. During static imaging, custom-made, contrast-medium-filled clear retainers were positioned in the mouth to allow visualization of the upper and lower incisors and hard palate boundaries. Static images were superimposed onto images of the three stages in deglutitive tongue movement, which were selected from a series of cine-MR images. These superimpositions were assessed five times by tracing cephalometric parameters to examine the reproducibility of the method.ResultsTraces varied little across repeated measurements, and all subjects had a similar pattern of dorsal tongue movement. Tongue-to-palate contact increased slightly during the first to second stage of swallowing and abruptly increased during the second to third stage, while the tongue tip position remained constant.ConclusionsSegmented cine-MR imaging combined with static MR images is useful for assessing soft tissue motion during deglutition. This method is particularly useful in dentistry to evaluate the relationship between tongue function and maxillofacial morphology in terms of orthodontic treatment and orofacial myofunctional therapy, and for improving tongue movement during speech therapy.Electronic supplementary materialThe online version of this article (10.1186/s40510-018-0245-x) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

New application of dynamic magnetic resonance imaging for the assessment of deglutitive tongue movement

et al. 2018

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“…MRI has been identified to have direct multi-planarity and high-quality soft tissue resolution (Honda, 2003;Qi et al, 2016). The longitudinal relaxation time (T1) of protons was noticeably shortened by the gadolinium component from the MCG solution.…”

Section: Discussionmentioning

confidence: 99%

Microbubbles containing gadolinium as contrast agents for both phase contrast and magnetic resonance imaging

Tang

Yan

Yang

et al. 2018

J Synchrotron Radiat

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Portal vein imaging is an important method for investigating portal venous disorders. However, the diagnostic requirements are not usually satisfied when using single imaging techniques. Diagnostic accuracy can be improved by combining different imaging techniques. Contrast agents that can be used for combined imaging modalities are needed. In this study, the feasibility of using microbubbles containing gadolinium (MCG) as contrast agents for both phase contrast imaging (PCI) and magnetic resonance imaging (MRI) are investigated. MCG were made by encapsulating sulfur hexafluoride (SF) gas with gadolinium and lyophilized powder. Absorption contrast imaging (ACI) and PCI of MCG were performed and compared in vitro. MCG were injected into the main portal trunk of living rats. PCI and MRI were performed at 2 min and 10 min after MCG injection, respectively. PCI exploited the differences in the refractive index and visibly showed the MCG, which were not detectable by ACI. PCI could facilitate clear revelation of the MCG-infused portal veins. The diameter of the portal veins could be determined by the largest MCG in the same portal vein. The minimum diameter of clearly detected portal veins was about 300 µm by MRI. These results indicate that MCG could enhance both PCI and MRI for imaging portal veins. The detection sensitivity of PCI and MRI could compensate for each other when using MCG contrast agents for animals.

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“…It includes delay or absence of food transfer and mistransfer to the airway [1]. Various techniques have been used to assess swallowing, both functionally and morphologically, such as videofluorography (VF), electromyography, deglutition pressure examination, ultrasonography, magnetic resonance imaging (MRI), and cone-beam computed tomography (CT) [2][3][4][5][6][7][8][9]. Although VF is the most common and effective method [1], accurately determining the reference points and investigating quantitatively is difficult because of variability in patients' positioning in each examination.…”

Section: Introductionmentioning

confidence: 99%

Computer-based videofluorographic analysis of posterior pharyngeal wall movement during swallowing in patients with head-and-neck cancer

Gotoh

Watanabe²,

Oh-Shige

et al. 2009

Oral Radiol

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Objectives We sought to develop a method for evaluating dysphagia using videofluorography (VF) by analyzing the time course of changes in pharyngeal wall movement and to assess patients with head-and-neck cancer before and after surgery. Methods The subjects were 14 patients diagnosed with head-and-neck cancer. We obtained VF images before and after surgery and analyzed them with two-dimensional video measurement software. Then, we calculated dysfunction scores based on the remaining or aspiration amount of sample by interpreting the VF images. Results We found dysmotility of the posterior pharyngeal wall in some postoperative cases. Inter-and intrarater reproducibility was high in the evaluation of posterior pharyngeal wall movements. A significant difference was found in the scores between the patients showing dysmotility of the posterior pharyngeal wall and no dysmotility. Conclusions We developed a reproducible method for evaluating movements of the posterior pharyngeal wall during swallowing using VF. This may become a useful tool for objectively evaluating VF data.

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Kinetic MRI using high-speed sequence to evaluate swallowing

Cited by 4 publications

References 9 publications

New application of dynamic magnetic resonance imaging for the assessment of deglutitive tongue movement

New application of dynamic magnetic resonance imaging for the assessment of deglutitive tongue movement

Microbubbles containing gadolinium as contrast agents for both phase contrast and magnetic resonance imaging

Computer-based videofluorographic analysis of posterior pharyngeal wall movement during swallowing in patients with head-and-neck cancer

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