Use of an advanced 3-T MRI movie to investigate articulation

Nunthayanon, Kulthida; Honda, Eiichi; Shimazaki, K.; Ohmori, Hidenobu; Inoue-Arai, Maristela Sayuri; Kurabayashi, Tohru; Ono, Takashi

doi:10.1016/j.oooo.2015.03.003

Cited by 7 publications

(7 citation statements)

References 33 publications

(49 reference statements)

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“…Due to the long imaging time of 3D MRI, 2D (typically midsagittal) images are used when articulation is dynamic or when a more realistic utterence duration is desired (see, e.g. Echternach et al, 2010;Nunthayanon et al, 2015). Midsagittal images can be used to track, for example, the tongue position, but they do not afford sufficient representation of the VT geometry for tasks such as formant estimation or analysing the tongue shape in the coronal plane.…”

Section: Articulationmentioning

confidence: 99%

“…This poses a challenge both because teeth are part of the acoustic space determining vowel qualities and because of the resulting gaps in the air-tissue interface in the images. Methods for imaging the teeth separately and aligning the images have been proposed (Takemoto et al, 2004;Nunthayanon et al, 2015;Luukinen et al, 2018), but standardised procedures do not yet exist.…”

Section: Articulationmentioning

confidence: 99%

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Interaction Mechanisms between Glottal Source and Vocal Tract in Pitch Glides

Murtola¹,

Malinen²

2018

Interspeech 2018

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Section: Articulationmentioning

confidence: 99%

Section: Articulationmentioning

confidence: 99%

Interaction Mechanisms between Glottal Source and Vocal Tract in Pitch Glides

Murtola¹,

Malinen²

2018

Interspeech 2018

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“…MRI data were acquired while the subject held blueberry juice as a contrast medium for MRI [87]. Trays containing ferric ammonium citrate gels, which are T1-shortening contrast media, were used to visualize the teeth [88]. A relatively simple approach involves acquiring MRI data while the subject wraps his or her tongue to the upper teeth followed by the lower teeth.…”

Section: Teethmentioning

confidence: 99%

Fast upper airway magnetic resonance imaging for assessment of speech production and sleep apnea

Kim

2018

Precis Future Med

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The human upper airway is involved in various functions, including speech, swallowing, and respiration. Magnetic resonance imaging (MRI) can visualize the motion of the upper airway and has been used in scientific studies to understand the dynamics of vocal tract shaping during speech and for assessment of upper airway abnormalities related to obstructive sleep apnea and swallowing disorders. Acceleration technologies in MRI are crucial in improving spatiotemporal resolution or spatial coverage. Recent trends in technical aspects of upper airway MRI are to develop state-of-the-art image acquisition methods for improved dynamic imaging of the upper airway and develop automatic image analysis methods for efficient and accurate quantification of upper airway parameters of interest. This review covers the fast upper airway magnetic resonance (MR) acquisition and reconstruction, MR experimental issues, image analysis techniques, and applications, mainly with respect to studies of speech production and sleep apnea.

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“…At present, many heart studies [ 5 ] and some speech organ studies [ 6 ] have been performed using MRI movies, but delineation of hard tissues, including the bone and teeth, remains difficult, although conventional methods for teeth delineation in MRI have been reported [ 7 – 9 ]. Our group researches MRI movie techniques for oral lesions, to evaluate articulation changes, especially movement of the tongue, palate, and teeth, before and after orthodontic and oral surgical treatment [ 10 ] and have reported many relevant findings [ 11 – 13 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of orthodontic appliance-derived artifacts on 3-T MRI movies

et al. 2018

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BackgroundMagnetic resonance imaging (MRI) has been used to study configurations of speech organs in the resting state. However, MRI is sensitive to metals, and numerous types of metallic appliances, most of which have a large magnetic susceptibility, are used in orthodontic treatment and may cause severe artifacts on MRI. We have developed techniques for obtaining MRI movies of the oral region, to evaluate articulatory changes, especially movement of the tongue, palate, and teeth, pre- and post-orthodontic/orthognathic treatment. We evaluated the influence of artifacts caused by orthodontic appliances, including fixed retainers, metal brackets, and wires, on measurements in 3-T MRI movies.MethodsSixteen healthy young adults (nine males, seven females; average age, 27 years) with normal occlusion were recruited. Four types of customized maxillary and mandibular plates were prepared by incorporating one of the following into the plate: (a) nothing, (b) a fixed canine-to-canine retainer, (c) metal brackets for the anterior and molar teeth, or (d) clear brackets for the anterior teeth and metal brackets for molars. A 3-T MRI movie, in segmented cine mode, was generated for each plate condition while participants pronounced a vowel-consonant-vowel syllable (/asa/). The size of the artifact due to the metallic brackets was measured. The face size and orthodontically important anatomical structures, such as the velum, the hard palate, and the laryngeal ventricle, were also measured.ResultsA large artifact was observed over the entire oral region around orthodontic appliances, altering regional visibility. The velopharyngeal height was measured as significantly longer in the presence of metal brackets. The maximum artifact size due to a metallic bracket was > 8 cm. Our results show that even if it is possible to obtain the measurements of palate length, nasion to sella, and nasion to basion in individuals wearing metal brackets for molars, the measurements might be affected due to the presence of artifacts.ConclusionsOrthodontic appliances, including metallic materials, sometimes produce significant measurement error in speech evaluation using MRI movies, which often become invisible or distorted by metallic orthodontic appliances. When the distorted image is measured, caution should be exercised, as the measurement may be affected. Based on the study, it is concluded that orthodontists should not necessarily remove all metallic appliances before MRI examination because the influence varies among the appliances and should also know that a significant measurement error in speech evaluation using MRI movie may occur by image distortion caused by metallic artifacts.

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Use of an advanced 3-T MRI movie to investigate articulation

Cited by 7 publications

References 33 publications

Interaction Mechanisms between Glottal Source and Vocal Tract in Pitch Glides

Interaction Mechanisms between Glottal Source and Vocal Tract in Pitch Glides

Fast upper airway magnetic resonance imaging for assessment of speech production and sleep apnea

Influence of orthodontic appliance-derived artifacts on 3-T MRI movies

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