000	00000nam 2200000za 4500
001	9.817666
003	CaOODSP
005	20250224155733
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008	160513s1987    onc     o    f|00 0 eng d
040	|aCaOODSP|beng
043	|an-cn---
086	1 |aH46-2/87-127E-PDF
100	1 |aStuchly, M. A.
245	10|aGuidelines on exposure to electromagnetic fields from magnetic resonance clinical systems |h[electronic resource] / |c[prepared by M.A. Stuchly] ; Environmental Health Directorate, Health Protection Branch.
260	|a[Ottawa] : |bHealth and Welfare Canada, |c[1987].
300	|av, 20 p.
490	0 |aSafety code ; |v26
490	0 |aEHD (Series) ; |v87-EHD-127
500	|a"Archived."
500	|aPublication replaced on February 24, 2025 as requested by the publisher.
500	|aIssued also in French under title: Lignes directrices sur l'exposition aux champs électromagnétiques provenant d'appareils cliniques à résonance magnétique.
504	|aIncludes bibliographic references.
520	3 |aMagnetic resonance imaging (MRI) and recently also magnetic resonance spectroscopy (MRS) have been gaining a widespread acceptance and many applications in clinical settings. These imaging devices utilize three types of fields, namely, the static magnetic field, the time-varying magnetic field and the radiofrequency (RF) field. Since each of the fields produced by MRI or MRS devices, if of a sufficient intensity, can produce detrimental biological effects, questions have been raised regarding the safety of these devices. Guidelines on device characteristics and patient and operator exposure have been published in some countries (the United States, the United Kingdom, the Federal Republic of Germany). This document briefly reviews biological effects of various fields used in magnetic resonance devices and provides general guidance on exposure levels to the patient and to the operator. The levels cited should not be considered as strict limits which if exceeded would result in a dangerous situation, but rather indicate the presently established levels below which potential hazards, if any, are considered minimal, if any. Higher exposure levels may still be safe, depending on various factors. For patient exposures exceeding the specified safe limits, the usual risk-benefit assessment has to be made.
692	07|2gccst|aMedical technology
692	07|2gccst|aSafety
710	1 |aCanada. |bHealth Canada.
775	08|tLignes directrices sur l'exposition aux champs électromagnétiques provenant d'appareils cliniques à résonance magnétique |w(CaOODSP)9.817669
856	40|qPDF|s84.4 KB|uhttps://publications.gc.ca/collections/collection_2025/sc-hc/H46-2-87-127-eng.pdf