AN APPARATUS AND A METHOD FOR HELIUM COLLECTION AND RELIQUEFACTION IN A MAGNETOENCEPHALOGRAPHY MEASUREMENT DEVICE

The invention relates to a method and a magnetoencephalography (MEG) measurement device. In the method there is determined the ending of a scheduled inactivity period of the MEG device. At the ending of the inactivity period a cryocooler of the MEG device is switched off. Helium is allowed to boil i...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	LAINE, Pasi Petteri, AHONEN, Antti, BLAAUWGEERS, Rob, LÄHTEENMÄKI, Sami Antero
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BASIC ELECTRIC ELEMENTS BLASTING COMBINED HEATING AND REFRIGERATION SYSTEMS DIAGNOSIS ELECTRICITY FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED,LIQUEFIED, OR SOLIDIFIED GASES FIXED-CAPACITY GAS-HOLDERS HEAT PUMP SYSTEMS HEATING HUMAN NECESSITIES HYGIENE IDENTIFICATION INDUCTANCES LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES MAGNETS MANUFACTURE OR STORAGE OF ICE MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES MECHANICAL ENGINEERING MEDICAL OR VETERINARY SCIENCE PHYSICS REFRIGERATION MACHINES, PLANTS OR SYSTEMS REFRIGERATION OR COOLING SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES STORING OF DISTRIBUTING GASES OR LIQUIDS SURGERY TESTING TRANSFORMERS VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED ORSOLIDIFIED GASES WEAPONS
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Beschreibung
Zusammenfassung:	The invention relates to a method and a magnetoencephalography (MEG) measurement device. In the method there is determined the ending of a scheduled inactivity period of the MEG device. At the ending of the inactivity period a cryocooler of the MEG device is switched off. Helium is allowed to boil in the Dewar vessel of the MEG device when the MEG device is active and used to perform patient measurements. The boiled helium is collected via a compressor to an external storage tank. When a new inactivity period for the MEG device commences, the cryocooler is started anew and helium is let from the external storage tank in-to the Dewar vessel, where it is re-liquefied by the cryocooler. The compressor may be switched off when the cryocooler is switched on.