Abstract: A method of obtaining an N.M.R. image of a specimen slice in the a-b plane is provided. The method comprises tipping the magnetization vector by an angle other than 180.degree.. The magnetization is then repeatedly reversed 180.degree. so as to produce a spin echo train. Simultaneously with the preceding steps, G.sub.a and G.sub.b sequences are applied in which the values of G.sub.a and G.sub.b remain constant over each spin echo while the absolute values or preferable their actual values thereof change from respective adjacent spin echoes, preferably incrementally in co-sinusoidal relationship. The tipping and reversing of the magnetization vector is preferably accomplished by means of rf pulses.

Abstract: A method of obtaining an NMR spectrum for at least a portion of a specimen slice is provided. The method comprises acquiring a number of projections of the specimen slice and shifting the projections by .DELTA.f for any point of interest. The shifted projections are then summed or compared to produce a resultant point spectrum. Preferably, shifted projections in each of a plurality of selected sets thereof are compared so as to produce a plurality of resultant spectra for the point which are used to produce a first iterated point spectrum. Additional stages of iteration are provided to minimize the effect of artifacts which comprises comparing aligned corresponding positions on an i iterated spectrum with a previously uncompared resultant point spectrum, so as to produce an i+1 iterated spectrum for the point, and repeating the foregoing a plurality of times, in each case using the iterated spectrum from the previous iteration as the i iterated spectrum.

Abstract: A cathode for a planar magnetron sputtering device has a housing which has a side with adjacent inner and outer surfaces, the outer surface being provided with a target mounting surface partially defined by opposed side edges extending along it. The housing also has an elongated cavity partially defined by the side. Clamps are provided to removably retain a target on the target mounting surface. A row of parallel, spaced apart, elongated magnet wafers are disposed in the cavity. The row is substantially equal in length to the length of the target mounting surface. Each pole of each of the magnets is disposed immediately adjacent the inner surface of the side, so that a substantially uniform magnetic field can extend directly from the row to adjacent to, and parallel with, an exposed surface of a target position on the target mounting surface. Additionally, shields which are normally grounded during operation of the cathode, are provided to minimize parasitic sputtering.