G - Physics – 01 – N
Patent
G - Physics
01
N
324/1
G01N 24/08 (2006.01)
Patent
CA 1184602
ABSTRACT INVESTIGATION OF SAMPLES BY N.M.R. TECHNIQUES Spatially discriminated information is obtained by appropriate processing of data derived from a series of pulsed N.M.R. operations performed with a magnetic field exhibiting a linear gradient whose magnitude is different for each operation, In obtaining a two- dimensional image of spin density distribution, coil sets (5 and 6) are used to generate magnetic field components giving x and y gradients, the former being changed stepwise in magnitude and the latter being fixed. For each value of x gradient, the sample (1) is irradiated with pulsed r.f. energy, resultant N.M.R. signals being detected by phase-sensitive detectors (19 and 20) whose outputs are regularly sampled by A-D converters (25 and 26). Processing of the complete sampled data by a computer (12) involves both Fourier transformation with respect to x gradient magnitude and Fourier transformation with respect to time. For sectional images a third coil set (7) is used to generate a component giving an alternating z gradient and the irradiation consists of a train of pulses.
394025
Fetherstonhaugh & Co.
National Research Development Corporation
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