Abstract
The problems connected with the evaluation of the helium boil off of a superconducting MRI magnet are discussed. The influence of changes in atmospheric pressure on the evaporation rate of a 1.5 T whole body tomograph magnet was investigated in experiments. The necessity of application of a pressure stabilizer for the boil off measurement was demonstrated. At the continuously stabilized helium bath pressure, the basic evaporation rate and also the boil off increase due to the eddy currents produced during the scanning procedure were measured.
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