Black R D, Early T A, Roemer P B, Mueller O M, Mogro-Campero A, Turner L G, Johnson G A
General Electric Corporate Research and Development Center, Schenectady, NY 12301.
Science. 1993 Feb 5;259(5096):793-5. doi: 10.1126/science.8430331.
A high-temperature superconducting-receiver system for use in nuclear magnetic resonance (NMR) microscopy is described. The scaling behavior of sources of sample and receiver-coil noise is analyzed, and it is demonstrated that Johnson, or thermal, noise in the receiver coil is the factor that limits resolution. The behavior of superconductors in the environment of an NMR experiment is examined, and a prototypical system for imaging biological specimens is discussed. Preliminary spin-echo images are shown, and the ultimate limits of the signal-to-noise ratio of the probe are investigated.
本文描述了一种用于核磁共振（NMR）显微镜的高温超导接收器系统。分析了样品源和接收线圈噪声的缩放行为，并证明接收线圈中的约翰逊噪声或热噪声是限制分辨率的因素。研究了超导体在NMR实验环境中的行为，并讨论了用于生物样本成像的原型系统。展示了初步的自旋回波图像，并研究了探头信噪比的最终极限。
