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T2強調シーケンスを用いた高速シネ磁気共鳴イメージングによる咽頭機能の評価：予備的研究
Evaluation of velopharyngeal function using high-speed cine-magnetic resonance imaging based on T2-weighted sequences: a preliminary study.
PMID: 31451304 DOI: 10.1016/j.ijom.2019.08.001.
抄録
T2強調シーケンスをベースにした高速シネ磁気共鳴画像（MRI）を用いて、velopharyngeal関連筋の3次元（3D）運動を可視化する新しい手法を導入することを目的とした。健常者11名を対象に、フォネーションおよび水嚥下関連事象の評価を行った。具体的には，これら2つの事象の間に正常なvelopharyngeal functionをcine-MRIで正確に可視化できるかどうかを検討した．その結果、11人全員の軟口蓋、上咽頭収縮筋、口蓋底筋の3次元運動が可視化された。その結果、上咽頭収縮筋と口蓋裂筋の磁気共鳴信号は、安静時に比べて発声時と水飲み込み時に有意に高いことが明らかになった。この最初の研究は、咽頭関連筋の3次元的な動きを、副作用なく正確に可視化することに成功したことを示唆している。ここで述べた手法を用いて上咽頭拘縮筋と口蓋裂筋に見られる磁気共鳴信号の変化は、副咽頭機能のより良い評価方法を開発するのに役立つはずです。
The objective was to introduce a new technique for visualizing the three-dimensional (3D) movements of velopharyngeal-related muscles using high-speed cine-magnetic resonance imaging (MRI) based on T2-weighted sequences. The evaluation of phonation- and water swallowing-related events was performed in 11 healthy subjects. Specifically, whether cine-MRI could precisely visualize normal velopharyngeal function during these two events was examined. The 3D movements of the soft palate, superior pharyngeal constrictor muscles, and levator veli palatini muscles were visualized in all 11 subjects. A noteworthy finding was that the magnetic resonance signals of the superior constrictor pharyngeal muscles and the levator veli palatini muscles were significantly higher during phonation and during water swallowing than at rest. This initial study suggests that the 3D movements of velopharyngeal-related muscles can be successfully and precisely visualized without side effects. The magnetic resonance signal changes seen in the superior pharyngeal constrictor and levator veli palatini muscles using the technique described here should be useful to develop better methods of evaluation of velopharyngeal function.
Copyright © 2019 International Association of Oral and Maxillofacial Surgeons. Published by Elsevier Ltd. All rights reserved.