Image quality in non-gated versus gated reconstruction of tongue motion using magnetic resonance imaging: a comparison using automated image processing
Image quality in non-gated versus gated reconstruction of tongue motion using magnetic resonance imaging: a comparison using automated image processing
复制标题
使用磁共振成像非门控与门控舌头运动重建的图像质量：使用自动图像处理的比较
DOI：
--
复制
发表时间：
2008
影响因子：
3
通讯作者：
G. Kochanski
中科院分区：
文献类型：
--
作者：
C. Alvey;Christina Orphanidou;J. Coleman;A. McIntyre;S. Golding;G. Kochanski
目的门控或心电触发磁共振的使用是一项成熟的技术，线圈技术的发展使这种方法能够应用于心脏以外的领域。然而，门控(心电或电影)与非门控或实时的图像质量在口腔中还没有得到广泛的评估。我们通过开发一种自动图像处理技术来评估两个图像序列，该技术比较了图像代表已知解剖结构的程度。方法四名受试者在磁共振扫描之前练习了实验性多音节句子。使用1.5T磁共振装置，我们在语音过程中获得了可比较的门控(使用人工触发器)和非门控矢状面图像。然后，我们使用一种图像处理算法，沿着穿过呼吸道的线对图像进行灰色建模。结果门控图像和非门控图像具有相似的空间分辨率，而非门控图像的分辨率略高一些(分辨率提高10%，小于1个像素)。然而，门控序列产生的图像的固有噪声大大降低，对空气和组织的辨别能力也大大提高。此外，门控序列显示出更高的时间分辨率。结论总体而言，门控成像技术的图像质量更好，尤其是考虑到其更高的时间分辨率。门控技术受到所涉及运动的重复性的限制，我们已经证明，对节拍器的语音可以足够地重复，以实现高质量的门控磁共振成像图像。我们认为门控序列对于评估涉及关节和肢体运动的其他类型的重复运动是有用的。
PurposeThe use of gated or ECG triggered MR is a well-established technique and developments in coil technology have enabled this approach to be applied to areas other than the heart. However, the image quality of gated (ECG or cine) versus non-gated or real-time has not been extensively evaluated in the mouth. We evaluate two image sequences by developing an automatic image processing technique which compares how well the image represents known anatomy.MethodsFour subjects practised experimental poly-syllabic sentences prior to MR scanning. Using a 1.5 T MR unit, we acquired comparable gated (using an artificial trigger) and non-gated sagittal images during speech. We then used an image processing algorithm to model the image grey along lines that cross the airway. Each line involved an eight parameter non-linear equation to model of proton densities, edges, and dimensions.ResultsGated and non-gated images show similar spatial resolution, with non-gated images being slightly sharper (10% better resolution, less than 1 pixel). However, the gated sequences generated images of substantially lower inherent noise, and substantially better discrimination between air and tissue. Additionally, the gated sequences demonstrate a very much greater temporal resolution.ConclusionOverall, image quality is better with gated imaging techniques, especially given their superior temporal resolution. Gated techniques are limited by the repeatability of the motions involved, and we have shown that speech to a metronome can be sufficiently repeatable to allow high-quality gated magnetic resonance imaging images. We suggest that gated sequences may be useful for evaluating other types of repetitive movement involving the joints and limb motions.
影响因子：
2.5
作者：
T. Baer;J. Gore;S. Boyce;P. W. Nye
通讯作者：
T. Baer;J. Gore;S. Boyce;P. W. Nye
交替手攻丝中手间协调的耦合振荡模型：重新评估。
DOI：
10.1037//0096-1523.27.2.251
发表时间：
2001
期刊：
Journal of experimental psychology. Human perception and performance
影响因子：
--
作者：
Semjen,A;Ivry,RB
通讯作者：
Ivry,RB