In the past year, effort in nuclear magnetic resonance imaging has been expanded on several research fronts. A. Following the failure of the magnet manufacturer to install successfully the clinical NMR imaging system in the Department of Radiology, Clinical Center, the research group took over the homogenizing of the magnetic field necessary for clinical imaging, and, using a new technique, achieved the specified homogeneity, thereby enabling the Radiology Department to produce high quality images. B. Considerable controversy exists within the NMR image community over the choice of an optimal field strength for imaging. Bench methods were developed for accurately assessing the signal-to-noise ratio from, and radio-frequency power deposition in, the human body at any frequency used for imaging. It is hoped these results will help resolve the matter. C. A pulse for highly selective spin population inversion has been discovered. The result is of considerable experimental and theoretical importance for it represents only the second known analytical solution of the non-linear differential equations governing the motion of an NMR spin system. Further, above a critical threshold, the inversion is independent of applied power. D. A so-called "quadrature" probe system has been invented which reduced radio-frequency power dissipation in the body by almost a factor of 2 while improving signal-to-noise ratio by almost 40%. E. The electronic upper frequency limit for adult head imaging has been pushed from 84 MHz to 130 MHz with the aid of a novel phased-array receiving coil.