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Comparison of Cartesian and Non-Cartesian Real-Time MRI Sequences at 1.5T to Assess Velar Motion and Velopharyngeal Closure during Speech

机译:比较1.5T时的笛卡尔和非笛卡尔实时MRI序列以评估言语中的运动和咽咽闭合

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摘要

Dynamic imaging of the vocal tract using real-time MRI has been an active and growing area of research, having demonstrated great potential to become routinely performed in the clinical evaluation of speech and swallowing disorders. Although many technical advances have been made in regards to acquisition and reconstruction methodologies, there is still no consensus in best practice protocols. This study aims to compare Cartesian and non-Cartesian real-time MRI sequences, regarding image quality and temporal resolution trade-off, for dynamic speech imaging. Five subjects were imaged at 1.5T, while performing normal phonation, in order to assess velar motion and velopharyngeal closure. Data was acquired using both Cartesian and non-Cartesian (spiral and radial) real-time sequences at five different spatial-temporal resolution sets, between 10 fps (1.7×1.7×10 mm3) and 25 fps (1.5×1.5×10 mm3). Only standard scanning resources provided by the MRI scanner manufacturer were used to ensure easy applicability to clinical evaluation and reproducibility. Data sets were evaluated by comparing measurements of the velar structure, dynamic contrast-to-noise ratio and image quality visual scoring. Results showed that for all proposed sequences, FLASH spiral acquisitions provided higher contrast-to-noise ratio, up to a 170.34% increase at 20 fps, than equivalent bSSFP Cartesian acquisitions for the same spatial-temporal resolution. At higher frame rates (22 and 25 fps), spiral protocols were optimal and provided higher CNR and visual scoring than equivalent radial protocols. Comparison of dynamic imaging at 10 and 22 fps for radial and spiral acquisitions revealed no significant difference in CNR performance, thus indicating that temporal resolution can be doubled without compromising spatial resolution (1.9×1.9 mm2) or CNR. In summary, this study suggests that the use of FLASH spiral protocols should be preferred over bSSFP Cartesian for the dynamic imaging of velopharyngeal closure, as it allows for an improvement in CNR and overall image quality without compromising spatial-temporal resolution.
机译:使用实时MRI对声道进行动态成像一直是一个活跃且不断发展的研究领域,已显示出在语音和吞咽障碍的临床评估中常规进行常规检查的巨大潜力。尽管在获取和重建方法方面取得了许多技术进步,但最佳实践方案仍未达成共识。这项研究的目的是比较笛卡尔和非笛卡尔实时MRI序列,有关图像质量和时间分辨率的权衡,用于动态语音成像。在进行正常发声的同时,以1.5T对5位受试者进行成像,以评估其纤维运动和咽喉闭合。使用笛卡尔和非笛卡尔(螺旋形和径向)实时序列以五个不同的时空分辨率集(10 fps(1.7×1.7×10 mm 3 )至25 fps)采集数据(1.5×1.5×10 mm 3 )。仅使用MRI扫描仪制造商提供的标准扫描资源来确保易于应用于临床评估和可重复性。通过比较纤维结构,动态对比噪声比和图像质量视觉评分的测量结果来评估数据集。结果表明,对于所有建议的序列,对于相同的时空分辨率,FLASH螺旋采集可提供更高的对比度/噪声比,在20 fps下可提高170.34%,比等效的bSSFP笛卡尔采集。在较高的帧速率(22和25 fps)下,螺旋协议是最佳的,并且比等效的径向协议具有更高的CNR和视觉评分。径向和螺旋采集的10和22 fps动态成像的比较显示CNR性能没有显着差异,因此表明可以将时间分辨率提高一倍而不会损害空间分辨率(1.9×1.9 mm 2 )或CNR 。总而言之,这项研究表明,对于咽喉闭合的动态成像,应优先使用FLASH螺旋协议而不是bSSFP直角坐标,因为它可以改善CNR和整体图像质量,而不会影响时空分辨率。

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