Department of Radiology, Stanford University, Stanford, California, USA.
Magn Reson Med. 2011 Jul;66(1):281-9. doi: 10.1002/mrm.22771. Epub 2011 Feb 1.
A 16-channel receive-only, closely fitted array coil is described and tested in vivo for bilateral breast imaging at 3 T. The primary purpose of this coil is to provide high signal-to-noise ratio and parallel imaging acceleration in two directions for breast MRI. Circular coil elements (7.5-cm diameter) were placed on a closed "cup-shaped" platform, and nearest neighbor coils were decoupled through geometric overlap. Comparisons were made between the 16-channel custom coil and a commercially available 8-channel coil. SENSitivity Encoding (SENSE) parallel imaging noise amplification (g-factor) was evaluated in phantom scans. In healthy volunteers, we compared signal-to-noise ratio, parallel imaging in one and two directions, Autocalibrating Reconstruction for Cartesian sampling (ARC) g-factor, and high spatial resolution imaging. When compared with a commercially available 8-channel coil, the 16-channel custom coil shows 3.6× higher mean signal-to-noise ratio in the breast and higher quality accelerated images. In patients, the 16-channel custom coil has facilitated high-quality, high-resolution images with bidirectional acceleration of R = 6.3.
一种 16 通道的仅接收、紧密贴合的阵列线圈，在 3T 下用于双侧乳房成像进行了描述和测试。该线圈的主要目的是为乳房 MRI 提供两个方向的高信噪比和并行成像加速。圆形线圈元件（直径 7.5 厘米）放置在封闭的“杯形”平台上，通过几何重叠使最近邻线圈解耦。对 16 通道定制线圈和商用 8 通道线圈进行了比较。在体模扫描中评估了灵敏度编码（SENSE）并行成像噪声放大（g 因子）。在健康志愿者中，我们比较了信噪比、一个和两个方向的并行成像、用于笛卡尔采样的自动校准重建（ARC）g 因子以及高空间分辨率成像。与商用 8 通道线圈相比，16 通道定制线圈在乳房中具有 3.6 倍的平均信噪比和更高质量的加速图像。在患者中，16 通道定制线圈已经实现了高质量、高分辨率的图像，并具有双向加速 R = 6.3。
