磁共振射频线圈单元数对图像信噪比的影响

Impact of MR Coils Element Numbers on Image Signal to Noise Ratio

在磁共振成像过程中,射频线圈用来接收信号,对成像的质量起着至关重要的作用。用户在采购磁共振设备时往往用线圈的通道数和单元数来评价一个线圈的成像能力,而线圈的通道数又必须和系统的接收通道数相匹配,因此一般认为,在系统其他条件一定的情况下,线圈的单元数越多,成像质量越好。本文以Philips Achieva3.0T磁共振为平台,分别选取了8通道8单元的Sense Head(头部)线圈和16通道18单元的Sense Neurovascular(神经血管)线圈作为比较对象进行扫描,比较两者成像的信噪比。另外,选取15通道15单元Sense Spine(全脊柱)线圈,先后用不同数量的采集单元数成像,然后对信噪比进行评价。

Radio-frequency （RF） coils are used to receive signals from human bodies during MRI imaging, they are important to the image quality. In the process of purchasing, technicians usually evaluate the imaging quality of RF coils based on their channels and elements numbers. Since the number of coil channels have to be matched with that of MRI system, more elements of RF coils result in better imaging quality under the same condition. In this paper, we chose Philips Achieva3.0T as the platform and compared the signal noise ratios of Sense Head Coil with 8 channels and 8 elements Sense NV coil with 16channels and 18elements. Moreover, we selected 15 channels Sense Spine coil but different number of elements respectively to scan phantoms and evaluate SNR.