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Nouveau type de cryostats magnétiques à faible bruit en plastique renforcé de fibres de verre pour la magnétocardiographie du cœur humain.

New type of magnetic low-noise glass fiber reinforced plastic cryostats for magnetocardiography of the human heart.

Résumé

  Magnetocardiography (MCG) is an innovative method of non-invasive diagnosis that can record the magnetic activity of the human body without contact. The magnetic fields of the body are caused by the muscle tissues activity inside the body. The extremely weak magnetic field generated by the human heart, in the range of 10- 9 Tesla is detected by highly sensitive SQUID sensors. To reduce the external disturbing magnetic noise (e.g. the influence of the earth's magnetic field), the examination must be performed in a shielding chamber. The sensors are cooled down to a temperature of 4.2 Kelvin (-269°C) using liquid helium, which puts them into the superconducting state.  In the publication, we present a new type of magnetic low-noise glass fiber reinforced plastic (GFRP) cryostat with a closed cooling circuit, which is able to re-liquefy evaporating helium directly in the cryostat via an integrated cold head of a cryocooler. In addition, the heat input to the cryostat has been minimized to such an extent that the power of the cryocooler is sufficient to reliquefy evaporating helium from a collection bladder after a short case of cryocooler downtime. In order to be able to perform the examination in a position that is comfortable for the patient, the MCG can be set and operated at an angle range between 0 and 45 degrees. The development aims to provide a much more accurate examination of the human heart, replacing the current state of the art in cardiac examination (the echocardiogram ECG) for clinical use.

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Pages : 7

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Détails

  • Titre original : New type of magnetic low-noise glass fiber reinforced plastic cryostats for magnetocardiography of the human heart.
  • Identifiant de la fiche : 30029021
  • Langues : Anglais
  • Source : Cryogenics 2021 online. Proceedings of the 16th IIR International Conference, October 5-7, 2021.
  • Date d'édition : 05/10/2021
  • DOI : http://dx.doi.org/10.18462/iir.cryo.2021.0030
  • Document disponible en consultation à la bibliothèque du siège de l'IIF uniquement.

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