CHU Rennes, Department of Neuroradiology, Rennes, France.
J Magn Reson Imaging. 2012 May;35(5):1233-9. doi: 10.1002/jmri.23586. Epub 2012 Jan 13.
To compare 12-channel and 32-channel phased-array coils and to determine the optimal parallel imaging (PI) technique and factor for brain perfusion imaging using Pulsed Arterial Spin labeling (PASL) at 3 Tesla (T).
Twenty-seven healthy volunteers underwent 10 different PASL perfusion PICORE Q2TIPS scans at 3T using 12-channel and 32-channel coils without PI and with GRAPPA or mSENSE using factor 2. PI with factor 3 and 4 were used only with the 32-channel coil. Visual quality was assessed using four parameters. Quantitative analyses were performed using temporal noise, contrast-to-noise and signal-to-noise ratios (CNR, SNR).
Compared with 12-channel acquisition, the scores for 32-channel acquisition were significantly higher for overall visual quality, lower for noise and higher for SNR and CNR. With the 32-channel coil, artifact compromise achieved the best score with PI factor 2. Noise increased, SNR and CNR decreased with PI factor. However mSENSE 2 scores were not always significantly different from acquisition without PI.
For PASL at 3T, the 32-channel coil at 3T provided better quality than the 12-channel coil. With the 32-channel coil, mSENSE 2 seemed to offer the best compromise for decreasing artifacts without significantly reducing SNR, CNR.
比较 12 通道和 32 通道相控阵线圈，并确定使用脉冲动脉自旋标记（PASL）在 3T 进行脑灌注成像的最佳并行成像（PI）技术和因子。
27 名健康志愿者在 3T 下使用 12 通道和 32 通道线圈进行 10 次不同的 PASL 灌注 PICORE Q2TIPS 扫描，不使用 PI，使用 GRAPPA 或 mSENSE，因子为 2。仅在 32 通道线圈上使用因子 3 和 4 的 PI。使用四个参数评估视觉质量。使用时间噪声、对比噪声比和信噪比（CNR、SNR）进行定量分析。
与 12 通道采集相比，32 通道采集的整体视觉质量评分更高，噪声更低，SNR 和 CNR 更高。使用 32 通道线圈，PI 因子 2 时获得的伪影妥协获得最佳评分。随着 PI 因子的增加，噪声增加，SNR 和 CNR 降低。然而，mSENSE 2 的评分并不总是明显不同于没有 PI 的采集。
对于 3T 的 PASL，3T 的 32 通道线圈提供的质量优于 12 通道线圈。使用 32 通道线圈，mSENSE 2 似乎可以在不显着降低 SNR、CNR 的情况下提供降低伪影的最佳折衷方案。
