Evaluation of hyoid bone movements in subjects with open bite: a study with real-time balanced turbo field echo cine-magnetic resonance imaging

Karaçay, Şeniz; Gökçe, Sıla Mermut; Yıldırım, Ersin

doi:10.4041/kjod.2012.42.6.318

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…Recent advances in MRI mean that it can now capture the motions of soft tissues during swallowing. Various high-speed MRI techniques such as echo-planar imaging, turbo-fast low-angle shot (turbo-FLASH), and single-shot fast spin echo, have been used for dynamic imaging of soft tissues during physiological motions 1,4,[6][7][8]10,11) . However, none of these methods allows full capture of movement during the pharyngeal phase, in which movements take less than 1 sec.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Parameter Settings in Cine-MR Imaging for Diagnosis of Swallowing

Ohkubo

Higaki

Nishikawa

et al. 2014

Bull. Tokyo Dent. Coll.

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Videofluorography is frequently used to evaluate swallowing and is considered the "gold standard" among imaging modalities. This modality, however, has several disadvantages, including radiation exposure and limitations in the detection of soft tissues. Conversely, magnetic resonance imaging (MRI) offers excellent contrast resolution in soft tissue without radiation exposure. A major drawback of MRI in evaluating swallowing, however, is that temporal resolution is poor. The aim of this study was to investigate a new cine-MRI modality. Imaging parameters were optimized and the efficacy of this new technique is discussed. Three techniques for speeding up MRI were combined: true fast imaging with steady state precession, generalized auto-calibrating partially parallel acquisition, and key-hole imaging. The effects of the receiver coils used, receiving bandwidth, slice thickness, and flip angle on each image were determined. The optimal imaging parameters obtained comprised a reduction factor of 2, receiving bandwidth of 1,000 Hz/pixel (repetition time of 151.7 milliseconds and echo time of 1.4 milliseconds), flip angle of 50°, and slice thickness of 6 mm. Neck and spine coils were used. Under these conditions, the new cine-MR imaging technique investigated showed a temporal resolution of 0.1 sec/slice (10 frames/sec). Even with optimized parameter settings, this technique did not allow a true temporal resolution of 30 frames/sec by a large margin. Motion artifacts persisted. Further study is needed on how to speed up this technique.

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Section: Introductionmentioning

confidence: 99%

Optimization of Parameter Settings in Cine-MR Imaging for Diagnosis of Swallowing

Ohkubo

Higaki

Nishikawa

et al. 2014

Bull. Tokyo Dent. Coll.

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“…Class II open-bite patients show a small volume of mouth closing muscles and well-developed suprahyoid muscle groups [17]. Ramus surgery for the counterclockwise rotation of the mandible increases the tension on the suprahyoid muscle groups [18]. This tension is considered a major etiologic factor for post-operative relapse [18, 19].…”

Section: Discussionmentioning

confidence: 99%

“…Ramus surgery for the counterclockwise rotation of the mandible increases the tension on the suprahyoid muscle groups [18]. This tension is considered a major etiologic factor for post-operative relapse [18, 19]. The relapse rate of class II open bite after orthognathic surgery varies considerably from 1.5 to 42.9% [20–24].…”

Section: Discussionmentioning

confidence: 99%

Botulinum toxin-A injection into the anterior belly of the digastric muscle for the prevention of post-operative open bite in class II malocclusions: a case report and literature review

Kang

Kuen

Choi

et al. 2019

Maxillofac Plast Reconstr Surg

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Background Class II malocclusion patients with hyperdivergent facial types are characterized by short mandibular body lengths and anterior open bite. Accordingly, the treatment for hyperdivergent skeletal class II malocclusion is a lengthening of the mandibular body length and a counterclockwise rotation of the mandible. To prevent post-operative relapse, botulinum toxin-A (BTX-A) injection can be a retention modality. Case presentation A class II open-bite patient received BTX-A injection to the anterior belly of her digastric muscle for the prevention of post-operative relapse. The relapse was evaluated via a clinical examination and a lateral cephalometric radiograph after the completion of post-surgical orthodontic treatment. The patient showed stable occlusion without any signs of relapse at 15 months post-operatively. Conclusion In this case presentation, a single injection into the anterior belly of the digastric muscle was sufficient for the prevention of post-operative open bite.

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“…Recent developments in MRI technology allow high-speed MRI sequences. Thus, pilot applications for dynamic imaging of swallowing have been reported (3)(4)(5)(6)(7)(8)(9).…”

Section: Introductionmentioning

confidence: 99%

Optimal contrast enhancement liquid for dynamic MRI of swallowing

Ohkubo

Higaki

Nishikawa

et al. 2016

J of Oral Rehabilitation

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Several dynamic magnetic resonance imaging (MRI) techniques to observe swallowing and their parameters have been reported. Although these studies used several contrast enhancement liquids, no studies were conducted to investigate the most suitable liquids. The purpose of this study was to identify the optimal contrast enhancement liquid for dynamic MRI of swallowing. MRI was performed using a new sequence consisting of true fast imaging with steady-state precession, generalised auto-calibrating partially parallel acquisition and a keyhole imaging technique. Seven liquids were studied, including pure distilled water, distilled water with thickener at 10, 20 and 30 mg mL(-1) concentrations and oral MRI contrast medium at 1, 2 or 3 mg mL(-1) . Distilled water showed the highest signal intensity. There were statistically significant differences among the following contrast media: distilled water with thickener at 20 mg mL(-1) and the oral MRI contrast medium at 2 mg mL(-1) and 1 mg mL(-1) . It can be concluded that the optimal liquid for dynamic MRI of swallowing is a water-based substance that allows variations in viscosity.

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Evaluation of hyoid bone movements in subjects with open bite: a study with real-time balanced turbo field echo cine-magnetic resonance imaging

Cited by 7 publications

References 28 publications

Optimization of Parameter Settings in Cine-MR Imaging for Diagnosis of Swallowing

Optimization of Parameter Settings in Cine-MR Imaging for Diagnosis of Swallowing

Botulinum toxin-A injection into the anterior belly of the digastric muscle for the prevention of post-operative open bite in class II malocclusions: a case report and literature review

Optimal contrast enhancement liquid for dynamic MRI of swallowing

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