Takahashi et al. (A-44) investigated the correlation of magnetic resonance signal intensity with spinal cord evoked potentials and spinal cord morphology after 5 hours of spinal cord compression in cats.

Twenty-four adult cats were divided into four groups on the basis of a measure of spinal cord function plus a control group that did not undergo spinal compression. Among the data collected were the following compression ratio [(sagittal diameter/transverse diameter) 100] values after 5 hours of compression:

Control 80.542986 79.111111 70.535714 87.323944 80.000000 82.222222 Group I 83.928571 84.183673 48.181818 98.461538 Group II 30.263158 34.865900 43.775100 82.439024 Group III 36.923077 31.304348 53.333333 55.276382 40.725806 Group IV 66.666667 29.565217 12.096774 34.274194 24.000000 Source: Data provided courtesy of Dr. Toshiaki Takahashi.