Department of Medical & Biological Engineering, Kyungpook National University, Daegu, Republic of Korea.
Department of Neurosurgery, Kyungpook National University Hospital, Daegu, Republic of Korea.
Stereotact Funct Neurosurg. 2021;99(2):159-166. doi: 10.1159/000510476. Epub 2020 Nov 26.
The usage of multichannel brain MRI coils, which have several advantages over single-channel brain coils used for stereotactic radiosurgery (SRS), requires a frame adapter device to fit the frames inside the multichannel brain coils. However, such a frame adapter has not been developed until now.
to develop an SRS frame adapter for multichannel MRI coils and verify the geometrical accuracy and signal-to-noise ratio (SNR) of the MR images obtained using multichannel MRI coils.
We fabricated an SRS frame adapter for a 48-channel MRI coil using a three-dimensional (3D) printer. Furthermore, we obtained phantom and human-brain MR images with a 3.0 Tesla MRI scanner using multi- and single-channel coils. Computed tomography (CT) phantom images were also obtained as reference. We compared the coordinate errors of the multi- and single-channel coils to evaluate the geometrical accuracy. Two neurosurgeons measured the coordinates. In addition, we compared the SNR differences between multi- and single-channel coils using the T1- and T2-weighted brain images.
For the CT coordinate measurements, the correlation coefficient r = 1 and p < 0.001 with respect to the 3 axes (Δx, Δy, and Δz) and 3D errors (Δr) showed no interpersonal differences between the 2 neurosurgeons. The results obtained using the T1-weighted images showed that a multichannel coil had smaller coordinate errors in Δx, Δy, Δz, and Δr than that observed in case of a single-channel coil (p < 0.001). In case of the SNR measurements, most of the brain areas showed higher SNRs when using a multichannel coil compared with that observed when using a single-channel coil in the T1- and T2-weighted images.
Compared with single-channel coils, the use of multichannel MRI coils with a newly developed frame adapter is expected to ensure successful SRS treatments with improved geometrical accuracy and SNR.
多通道脑 MRI 线圈的使用优于立体定向放射外科（SRS）中使用的单通道脑线圈，它需要一个框架适配器装置来将框架安装在多通道脑线圈内。然而，到目前为止还没有开发出这样的框架适配器。
开发一种用于多通道 MRI 线圈的 SRS 框架适配器，并验证使用多通道 MRI 线圈获得的磁共振图像的几何精度和信噪比（SNR）。
我们使用 3D 打印机制造了一个用于 48 通道 MRI 线圈的 SRS 框架适配器。此外，我们使用 3.0T MRI 扫描仪获得了多通道和单通道线圈的体模和人脑磁共振图像。还获得了 CT 体模图像作为参考。我们比较了多通道和单通道线圈的坐标误差，以评估几何精度。两位神经外科医生测量了坐标。此外，我们还使用 T1 和 T2 加权脑图像比较了多通道和单通道线圈的 SNR 差异。
对于 CT 坐标测量，在 3 个轴（Δx、Δy 和 Δz）和 3D 误差（Δr）方面，2 位神经外科医生之间的相关系数 r = 1，p < 0.001，没有人际差异。使用 T1 加权图像的结果表明，与单通道线圈相比，多通道线圈在 Δx、Δy、Δz 和 Δr 中的坐标误差更小（p < 0.001）。在 SNR 测量方面，在 T1 和 T2 加权图像中，与使用单通道线圈相比，多通道线圈在大多数脑区的 SNR 更高。
与单通道线圈相比，使用新开发的框架适配器的多通道 MRI 线圈有望确保成功的 SRS 治疗，提高几何精度和 SNR。
