Use of an advanced 3-T MRI movie to investigate articulation
Use of an advanced 3-T MRI movie to investigate articulation
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DOI：
10.1016/j.oooo.2015.03.003
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发表时间：
2015-06-01
影响因子：
2.9
通讯作者：
Ono, Takashi
中科院分区：
文献类型：
--
作者：
Nunthayanon, Kulthida;Honda, Ei-ichi;Ono, Takashi
目标。开发一部磁共振成像(MRI)电影，以揭示关节和牙齿的动态运动。研究设计。五名咬合正常的健康女性参与了这项研究。根据面部标记和凝胶的使用，测试了不同浓度的MRI造影剂(柠檬酸铁铵[FAC])对牙齿的可视化。定制的电路被连接起来，以使摩擦音(/ASA/)的发音与扫描同步。使用9ms和31.5ms的重复时间(TRs)测试了三种梯度回波序列(带稳态进动的真快速成像[真FISP]、FISP和快速小角度激发[闪光])。核磁共振电影图像叠加在牙齿的边界上。在发音过程中，使用两种不同的RR(9ms和31ms)产生的图像进行比较，以评估嘴唇和舌头的位置。使用9ms或31.5ms的tr闪光序列获得的图像可用于诊断目的。在获得161张连续图像的情况下，9ms的tr生成了质量最高的牙齿图像，几乎没有伪影。辅音“S”的发音清晰可辨。我们的3-T磁共振电影系统，时间分辨率低于9ms，可以提供与语音或口咽功能变化有关的详细信息。
Objective. To develop a magnetic resonance imaging (MRI) movie to reveal the dynamic movement of articulators and teeth.Study Design. Five healthy females with normal occlusion participated in this study. Various concentrations of MRI contrast media (ferric ammonium citrate [FAC]) were tested for visualization of teeth, according to facial markers and with the use of a gel. Custom-made circuitry was connected to synchronize pronunciation of fricative sounds (/asa/) with scans. Three gradient echo sequences (True fast imaging with steady state precession [true FISP], FISP, and fast low angle shot [FLASH]) with a segmented cine were tested with the use of repetition times (TRs) of 9 ms and 31.5 ms. The MRI movie images were superimposed over the boundaries of teeth. The images produced during pronunciation, using the two different TRs (9 ms and 31 ms), were compared to assess the position of the lips and the tongue.Results. Images obtained using the FLASH sequence, with a TR of 9 ms or 31.5 ms, can be used for diagnostic purposes. A TR of 9 ms, with 161 continuous images acquired, produced the highest-quality images of teeth, with few artifacts present. Pronunciation of the consonant "s" was clearly discernable.Conclusions. Our 3-T MRI movie system, with a temporal resolution less than 9 ms, can provide detailed information pertaining to variations in speech or oropharyngeal function.