Munhall Christopher C, Roberts Donna R, Labadie Robert F
Department of Otolaryngology-Head and Neck Surgery, Medical University of South Carolina, Charleston, South Carolina.
Department of Radiology, Medical University of South Carolina, Charleston, South Carolina.
Otol Neurotol Open. 2024 Mar 7;4(1):e049. doi: 10.1097/ONO.0000000000000049. eCollection 2024 Mar.
To assess image artifact when imaging a cochlear implant (CI) with a conventional 3T MRI machine compared with a very low-field (0.064T) MRI.
None.
Diagnostic study.
Image artifact size associated with the CI affixed to an MRI phantom at very low-field 0.064T MRI versus 3T MRI.
The longest diameter of the image artifact was 125 mm for the 3T MRI and 86 mm for the 0.064T MRI, representing 45% longer image artifact generated in the 3T MRI. The actual volume of the imaging phantom was 1371 cm. The volume of the image artifact was measured as 379 cm in the 3T MRI, representing a loss of 27.6% of the actual volume of the imaging phantom. The volume of image artifact was measured as 170 cm in the 0.064T MRI, representing a loss of 12.4% of the phantom volume.
3T MRI had better image quality. This result was not surprising given that larger magnetic field strength is known to provide higher resolution. There was 15% less image artifact generated in the very low-field MRI machine compared with a conventional 3T device. And there was also subjectively increased distortion of the imaging phantom at 3T MRI compared with the 0.064T MRI. With minimized safety concerns and a much lower cost than conventional 3T machines, very low-field scanners may find expanded clinical uses. This preclinical study explores the potential utility of very low-field MRI in scanning CI recipients.
评估使用传统3T磁共振成像（MRI）机器对人工耳蜗（CI）成像时的图像伪影，并与极低场（0.064T）MRI进行比较。
无。
诊断性研究。
与附着在MRI体模上的CI在极低场0.064T MRI和3T MRI下相关的图像伪影大小。
3T MRI的图像伪影最长直径为125毫米，0.064T MRI为86毫米，这表明3T MRI产生的图像伪影长45%。成像体模的实际体积为1371立方厘米。在3T MRI中测得图像伪影体积为379立方厘米，占成像体模实际体积的27.6%。在0.064T MRI中测得图像伪影体积为170立方厘米，占体模体积的12.4%。
3T MRI具有更好的图像质量。鉴于已知更大的磁场强度能提供更高的分辨率，这一结果并不令人意外。与传统3T设备相比，极低场MRI机器产生的图像伪影减少了15%。而且与0.064T MRI相比，3T MRI下成像体模的主观变形也有所增加。由于安全问题最小化且成本远低于传统3T机器，极低场扫描仪可能会有更广泛的临床应用。这项临床前研究探讨了极低场MRI在扫描CI植入者方面的潜在用途。
