Quantitative analysis of the velocity and synchronicity of diaphragmatic motion: dynamic MRI in different postures
Quantitative analysis of the velocity and synchronicity of diaphragmatic motion: dynamic MRI in different postures
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DOI：
10.1016/j.mri.2006.08.009
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发表时间：
2006-12-01
影响因子：
2.5
通讯作者：
Takahashi, Masaya
中科院分区：
文献类型：
--
作者：
Kiryu, Shigeru;Loring, Stephen H.;Takahashi, Masaya
本研究的目的是利用动态磁共振(MR)成像技术，评估正常受试者呼吸过程中左右横隔膜运动之间的关系，并研究肺运动随体位变化的变化。使用1.5T磁共振扫描仪进行成像，快速成像采用躯干线圈的稳态采集。8名健康受试者被指示从末吸气到末呼气尽可能缓慢且尽可能深地呼吸。成像和呼吸一起开始，以提供冠状平面上的连续图像。成像序列是由宠物形成的仰卧、俯卧、左侧卧位和右侧卧位。测量最大头点在头尾轴线上的运动分量，计算呼气相和吸气相的横隔膜位移(最大横隔膜位移)、左右横隔膜运动的同步性和速度。除左侧卧位外，大多数体位右半横肌的移动量较大。在仰卧位和俯卧位时，两个半横肌在吸气和呼气时是同步运动的。两种侧卧位时，在呼气相时，横隔膜的运动速度不同，而在吸气相时，其运动速度相同。这里描述的方法允许评估横隔膜的运动。左右半横肌的运动随着姿势的不同而变化。此外，在呼气相和吸气相之间，横隔膜的运动也不同。这项研究表明，动态磁共振成像在评估肺功能或肺功能缺陷方面具有进一步的潜力。(C)2006 Elsevier Inc.保留所有权利。
The objectives of this study were to assess the relationship between right and left hemidiaphragmatic motions during breathing in normal subjects and to investigate alterations in lung motion with changes in posture, using dynamic magnetic resonance (MR) imaging. Imaging was conducted with a 1.5-T MR scanner using fast imaging employing steady-state acquisition with a torso coil. Eight healthy subjects were instructed to breathe from end-inspiration to end-expiration as slowly and as deeply as possible. Imaging and breathing were started together to afford sequential images on the coronal plane. Imaging sequences were pet-formed in supine, prone, left lateral decubitus and right lateral decubitus postures. The component of movement of the most cephalic point in the cephalocaudal axis was measured, and the diaphragmatic excursion (maximum hemidiaphragmatic displacement), synchrony and velocity of the right and left hemidiaphragmatic motions were calculated during the expiratory phase and the inspiratory phase, respectively. Excursion was greater in the right hemidiaphragm in most postures, except the left lateral decubitus. In supine and prone postures, both hemidiaphragms moved synchronously in both inspiratory and expiratory phases. In both lateral decubims postures, the hemidiaphragms moved asynchronously with different velocities in the expiratory phase but with the same velocities in the inspiratory phase. The method described here allowed the assessment of diaphragmatic motions. Motions in the right and left hemidiaphragms changed with posture. In addition, diaphragmatic motion differed between expiratory and inspiratory phases. This study suggests the further potential of dynamic MR imaging for the evaluation of pulmonary functions or deficiencies. (c) 2006 Elsevier Inc. All rights reserved.