Practical approaches to the evaluation of signal-to-noise ratio performance with parallel imaging: Application with cardiac imaging and a 32-channel cardiac coil
Practical approaches to the evaluation of signal-to-noise ratio performance with parallel imaging: Application with cardiac imaging and a 32-channel cardiac coil
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DOI：
10.1002/mrm.20636
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发表时间：
2005-09-01
影响因子：
3.3
通讯作者：
Schoenberg, SO
中科院分区：
文献类型：
--
作者：
Reeder, SB;Wintersperger, BJ;Schoenberg, SO
在这项工作中，描述了并行成像中测量信噪比（SNR）性能的两种实用方法。使用稳态自由进动 (SSFP) 和 TSENSE，在 1.5 T 超快心脏 CINE 成像背景下，使用 32 通道心脏线圈进行体模和人体研究。将使用“多次采集”方法的 SNR 和 g 因子体模测量值与“差值法”的测量值进行比较。两种方法之间具有极好的一致性，并且 g 因子与文献中的理论预测显示出定性的一致性。显示了使用 TSENSE 从人类志愿者采集的高时间 (42.6 ms) 和空间 (2.1 x 2.1 x 8 mm(3)) 分辨率心脏 CINE SSFP 图像的示例，加速因子高达 7。图像质量与模型 SNR 测量结果定性一致，表明最佳加速度为 4。通过这种加速，可以在18次心跳屏气。
In this work, two practical methods for the measurement of signal-to-noise-ratio (SNR) performance in parallel imaging are described. Phantoms and human studies were performed with a 32-channel cardiac coil in the context of ultrafast cardiac CINE imaging at 1.5 T using steady-state free precession (SSFP) and TSENSE. SNR and g-factor phantom measurements using a "multiple acquisition" method were compared to measurements from a "difference method". Excellent agreement was seen between the two methods, and the g-factor shows qualitative agreement with theoretical predictions from the literature. Examples of high temporal (42.6 ms) and spatial (2.1 x 2.1 x 8 mm(3)) resolution cardiac CINE SSFP images acquired from human volunteers using TSENSE are shown for acceleration factors up to 7. Image quality agrees qualitatively with phantom SNR measurements, suggesting an optimum acceleration of 4. With this acceleration, a cardiac function study consisting of 6 image planes (3 short-axis views, 3 long-axis views) was obtained in an 18-heartbeat breath-hold.