Recognition of multiple sclerosis lesions in MR images

A method of and a system for dissipating the heat produced by electronic components, especially motor-control thyristors (silicon-controlled rectifiers) used in motor-control circuits in cryogenic installations. A part of the cooled fluid circulated in the installation is diverted from its circulation or displacement path and used to cool the power thyristors which are employed in frequency inverters and like electronic circuitry used to control the speeds of compressor motors of such installations. The thyristor may be mounted in vaporizer or evaporator of the cryogenic installation which preferably is a refrigeration unit or system for the low-temperature rectification of air or other gas mixtures.