A 3 D Parallel Imaging Capable Transmit and 15-Channel Receive Array Knee Coil at 3 T
A 3 D Parallel Imaging Capable Transmit and 15-Channel Receive Array Knee Coil at 3 T
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具有 3D 并行成像能力的发射和 15 通道接收阵列膝部线圈（3 T）
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
H. Fujita
中科院分区：
文献类型：
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作者：
M. Finnerty;J. Herczak;T. Zheng;J. Weaver;X. Yang;H. Fujita
简介：3 T膝关节成像优于1.5T，因为更高的空间分辨率和更高的SNR增强了诊断关键膝关节结构（如膝关节韧带、交叉韧带和关节软骨）的能力[1]。然而，当前的商用膝关节线圈容易受到脉动/流动伪影的影响，因为血液主要在S-I方向上流动。因此，S-I方向上的多行元件是优选的，以允许S-I方向上的相位编码[2]。此外，通过使用局部发射线圈，与采用全身发射线圈的情况相比，需要更少的发射功率。这种方法能够实现更先进、严格和快速的成像应用（例如，在短的采集时间内收集更多的切片），如果使用全身发射线圈，则会受到SAR限制的限制或禁用。此外，局部发射线圈避免了通常存在于全身发射线圈情况中的环绕伪影。在早期的工作中，增加通道数量，同时在S-I方向上提供两行元素，显示出PI加速因子为2的伪影的明显改善[1]。然而，中心处的SNR显著低于市售膝关节线圈[1]。现在，已经开发了一种15通道膝关节线圈，该线圈在S-I方向上利用三排元件，这允许3D并行成像，同时提供高SNR和良好的均匀性，具有较大的线圈内径。
Introduction: Knee imaging at 3T offers advantages over 1.5T in that the greater spatial resolution and higher SNR enhance the ability to make diagnoses of critical knee structures, such as menisci, the cruciate ligaments, and articular cartilage [1]. However, current commercial knee coils are susceptible to pulsation/flow artifacts since the blood flows primarily in the S-I direction. Therefore, multiple rows of elements in the S-I direction are preferred, to allow for phase encoding in the S-I direction [2]. Furthermore, by using a local transmit coil, it requires a less transmit power compared with a case where a whole body transmit coil is employed. This approach enables more advanced, rigorous and fast imaging applications (e.g., collecting more slices within a short acquisition time) that would have been limited or disabled by SAR limit if the whole body transmit coil were used. In addition, the local transmit coil avoids wraparound artifacts often present in the whole body transmit coil case. In earlier work, increasing the number of channels while providing two rows of elements in the S-I direction showed a clear improvement in the artifact with a PI acceleration factor of two [1]. However, SNR at the center was significantly lower than a commercially available knee coil [1]. Now, a 15-channel knee coil has been developed that utilizes three rows of elements in the S-I direction, which allows for 3D parallel imaging while providing high SNR and good uniformity with a larger coil inner diameter.