论文标题
sub-sm $^{ - 1} $电磁感应成像，带有未屏蔽的原子磁力计
Sub-Sm$^{-1}$ electromagnetic induction imaging with an unshielded atomic magnetometer
论文作者
论文摘要
用原子磁力计电磁诱导成像的进展使其结构域到达对生物医学成像有用的状态的边缘。但是，在所需的1 sm $^{ - 1} $级别以下成像的演示仍然丢失。在这封信中，我们使用$^{87} $ rb射频原子磁力计在室温附近，在未屏蔽的环境中工作，图像模仿活组织的电导率的校准解决方案。通过将最近引入的近谐成像技术与双射频线圈激发方案相结合，我们将5 ml的解决方案降低至0.9 sm $^{ - 1} $。我们在2 MHz时以0.9 sm $^{ - 1} $测量的信噪比为2.7，并在离线平均值时增加到7.2。我们的工作是先前成像结果的50倍，并证明了成像生物组织所需的非屏蔽环境的灵敏度和稳定性，尤其是人类心脏。
Progress in electromagnetic induction imaging with atomic magnetometers has brought its domain to the edge of the regime useful for biomedical imaging. However, a demonstration of imaging below the required 1 Sm$^{-1}$ level is still missing. In this Letter, we use an $^{87}$Rb radio-frequency atomic magnetometer operating near room temperature in an unshielded environment to image calibrated solutions mimicking the electric conductivity of live tissues. By combining the recently introduced near-resonant imaging technique with a dual radio-frequency coil excitation scheme, we image 5 mL of solutions down to 0.9 Sm$^{-1}$. We measure a signal-to-noise ratio of 2.7 at 2 MHz for 0.9 Sm$^{-1}$, increased up to 7.2 with offline averaging. Our work is an improvement of 50 times on previous imaging results, and demonstrates the sensitivity and stability in unshielded environments required for imaging biological tissues, in particular for the human heart.
