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Visualizzazione post con etichetta Risonanza Magnetica. Mostra tutti i post
Visualizzazione post con etichetta Risonanza Magnetica. Mostra tutti i post

martedì 9 giugno 2015

Pericoli dalla Risonanza Magnetica

Viene pubblicato un estensivo lavoro di raccolta di precedenti studi sugli effetti di una macchina di indagine a risonanza magnetica su organismi cellulari sia umani che di batteri.

Il risultato di correlazione è positivo, per cui, pur valutando come questa tecnica sia molto importante nella diagnostica ospedaliera in quanto non invasiva, gli autori segnalano che debbono essere approfonditi gli studi per individuare protocolli che determino condizioni di maggiore sicurezza.


Ovviamente, quanto sopra non vale per le persone elettrosensibili, in quanto queste macchine generano diversi campi:
- statico magnetico
- magnetico dinamico che varia in base al tempo
- radiofrequenze !
e quindi ... fuggire !!!   idem dalla TAC , dai raggi X , .... rimane solo l'ecografia !



Magnetic resonance imaging (MRI): A review of genetic damage investigations
Vijayalaxmi, Fatahi M, Speck O. Magnetic resonance imaging (MRI): A review of genetic damage investigations. Mutat Res Rev Mutat Res. 2015 Apr-Jun;764:51-63. doi: 10.1016/j.mrrev.2015.02.002. Epub 2015 Feb 21.

Abstract

Magnetic resonance imaging (MRI) is a powerful, non-invasive diagnostic medical imaging technique widely used to acquire detailed information about anatomy and function of different organs in the body, in both health and disease. It utilizes electromagnetic fields of three different frequency bands: static magnetic field (SMF), time-varying gradient magnetic fields (GMF) in the kHz range and pulsed radiofrequency fields (RF) in the MHz range. There have been some investigations examining the extent of genetic damage following exposure of bacterial and human cells to all three frequency bands of electromagnetic fields, as used during MRI: the rationale for these studies is the well documented evidence of positive correlation between significantly increased genetic damage and carcinogenesis. Overall, the published data were not sufficiently informative and useful because of the small sample size, inappropriate comparison of experimental groups, etc. Besides, when an increased damage was observed in MRI-exposed cells, the fate of such lesions was not further explored from multiple 'down-stream' events. This review provides: (i) information on the basic principles used in MRI technology, (ii) detailed experimental protocols, results and critical comments on the genetic damage investigations thus far conducted using MRI equipment and, (iii) a discussion on several gaps in knowledge in the current scientific literature on MRI. Comprehensive, international, multi-centered collaborative studies, using a common and widely used MRI exposure protocol (cardiac or brain scan) incorporating several genetic/epigenetic damage end-points as well as epidemiological investigations, in large number of individuals/patients are warranted to reduce and perhaps, eliminate uncertainties raised in genetic damage investigations in cells exposed in vitro and in vivo to MRI.
http://1.usa.gov/1QGGT5u

lunedì 12 maggio 2014

Effetti della Risonanza Magnetica sul personale tecnico

Questo studio evidenzia la relazione tra potenza deìi emissione degli apparati per la risonanza ed effetti riportati da   personale ospedaliero a contatto.
361 tecnici sono stati monitorati: si è evidenziata una chiara correlazione   proporzionale alla potenza in Testa emessa:  parliamo di persone 'normali' (non elettrosensibili) che hanno riportato vertigini e sapore metallico in bocca:  sintomi ben conosciuti dagli elettrosensibili !

Immaginate quali possano essere gli effetti su un elettrosensibile infilato dentro alla macchina per la risonanza !





Occup Environ Med 2014;71:423-429 doi:10.1136/oemed-2013-101890
  • Workplace
  • Original article

Occupational exposure of healthcare and research staff to static magnetic stray fields from 1.5–7 Tesla MRI scanners is associated with reporting of transient symptoms

Open Access
  1. Kristel Schaap1
  2. Yvette Christopher-de Vries1
  3. Catherine K Mason1
  4. Frank de Vocht2,
  5. Lützen Portengen1
  6. Hans Kromhout1
-Author Affiliations
  1. 1Division of Environmental Epidemiology, Institute for Risk Assessment Sciences, Utrecht University,Utrecht, The Netherlands
  2. 2Centre for Occupational and Environmental Health, Centre of Epidemiology, Institute of Population Health, Manchester Academic Health Sciences Centre, The University of Manchester, Manchester, UK
  1. Correspondence toProfessor Hans Kromhout, Institute for Risk Assessment Sciences, Utrecht University, PO Box 80178, Utrecht 3508 TD, The Netherlands; h.kromhout@uu.nl
  • Received 27 September 2013
  • Revised 26 February 2014
  • Accepted 16 March 2014
  • Published Online First 8 April 2014

Abstract

Objectives Limited data is available about incidence of acute transient symptoms associated with occupational exposure to static magnetic stray fields from MRI scanners. We aimed to assess the incidence of these symptoms among healthcare and research staff working with MRI scanners, and their association with static magnetic field exposure.
Methods We performed an observational study among 361 employees of 14 clinical and research MRI facilities in The Netherlands. Each participant completed a diary during one or more work shifts inside and/or outside the MRI facility, reporting work activities and symptoms (from a list of potentially MRI-related symptoms, complemented with unrelated symptoms) experienced during a working day. We analysed 633 diaries. Exposure categories were defined by strength and type of MRI scanner, using non-MRI shifts as the reference category for statistical analysis. Non-MRI shifts originated from MRI staff who also participated on MRI days, as well as CT radiographers who never worked with MRI.
Results Varying per exposure category, symptoms were reported during 16–39% of the MRI work shifts. We observed a positive association between scanner strength and reported symptoms among healthcare and research staff working with closed-bore MRI scanners of 1.5 Tesla (T) and higher (1.5 T OR=1.88; 3.0 T OR=2.14; 7.0 T OR=4.17). This finding was mainly driven by reporting of vertigo and metallic taste.
Conclusions The results suggest an exposure-response association between exposure to strong static magnetic fields (and associated motion-induced time-varying magnetic fields) and reporting of transient symptoms on the same day of exposure.