Alam Wahidul, Reineke Scott, Raja Viswanath Madavan, Rusho Rushdi Zahid, Van Daele Douglas, Meyer David, Liu Junjie, Lingala Sajan Goud
Roy J. Carver Department of Biomedical Engineering, The University of Iowa, Iowa City, Iowa, USA.
ScanMed LLC, Omaha, Nebraska, USA.
Magn Reson Med. 2023 May;89(5):2117-2130. doi: 10.1002/mrm.29559. Epub 2022 Dec 9.
To develop a custom coil and evaluate its utility for accelerated upper and infraglottic airway MRI at 3 T.
A 16-channel flexible and anatomy-conforming coil was developed to provide localized sensitivity over upper and infraglottic airway regions of interest. Parallel-imaging capabilities were compared against existing head and head-neck coils. SENSE geometry factor losses were quantified for retrospectively accelerating 3D MRI. Blinded image-quality ratings from two experts were performed. Spiral GRAPPA reconstructions were evaluated for a speaking task at a time resolution of 40 ms. Contrast-to-noise ratios between air and tissue at key landmarks along the vocal tract were compared. SENSE imaging with the custom coil in the lateral recumbent posture was evaluated. Multislice imaging was performed to image swallowing at 17 ms/frame via constrained reconstruction.
The custom coil showed improved SENSE imaging up to 3-fold acceleration when accelerated along either the anterior-posterior or the superior-inferior direction and a net 4-fold acceleration when accelerated along both directions. Spiral GRAPPA reconstructions with the custom coil showed higher contrast-to-noise ratio when compared with existing coils. In the lateral posture, robust SENSE imaging was achieved at up to 2-fold and 3-fold acceleration levels in the superior-inferior and anterior-posterior directions, respectively. Key events of swallowing in the multislice dynamic images were identified by an otolaryngologist.
The coil provided improved parallel imaging of upper and infraglottic airway in both supine and lateral recumbent postures. It enabled efficient accelerated dynamic imaging of speaking and swallowing.
开发一种定制线圈，并评估其在3T场强下用于加速上气道和声门下气道MRI检查的效用。
开发了一种16通道的柔性且符合解剖结构的线圈，以在上气道和声门下气道感兴趣区域提供局部灵敏度。将并行成像能力与现有的头部和头颈线圈进行比较。对回顾性加速三维MRI的敏感性编码（SENSE）几何因子损失进行量化。由两位专家进行盲法图像质量评级。对说话任务以40毫秒的时间分辨率评估螺旋式广义自校准部分并行采集（GRAPPA）重建。比较沿声道关键标志处空气与组织之间的对比噪声比。评估定制线圈在侧卧位时的SENSE成像。通过约束重建进行多层成像以17毫秒/帧的速度对吞咽进行成像。
当沿前后方向或上下方向加速时，定制线圈的SENSE成像加速效果提高了3倍，而沿两个方向同时加速时净加速效果提高了4倍。与现有线圈相比，定制线圈的螺旋式GRAPPA重建显示出更高的对比噪声比。在侧卧位时，分别在上下方向和前后方向上以高达2倍和3倍的加速水平实现了稳健的SENSE成像。耳鼻喉科医生在多层动态图像中识别出了吞咽的关键事件。
该线圈在仰卧位和侧卧位时均能改善上气道和声门下气道的并行成像效果。它能够实现对说话和吞咽的高效加速动态成像。
