Exposure to time varying magnetic fields associated with magnetic resonance imaging reduces fentanyl-induced analgesia in mice

1988 ◽  
Vol 9 (2) ◽  
pp. 167-174 ◽  
Author(s):  
G. Campbell Teskey ◽  
Klaus-Peter Ossenkopp ◽  
Frank S. Prato ◽  
Martin Kavaliers
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
Time Varying ◽  
Resonance Imaging

scholarly journals Magnetic resonance imaging of time-varying magnetic fields from therapeutic devices

2014 ◽  
Vol 27 (9) ◽  
pp. 1142-1142
Author(s):  
Luis Hernandez-Garcia ◽  
Vivek Bhatia ◽  
Krishan Prem-Kumar ◽  
Magnus Ulfarsson
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
Time Varying ◽  
Resonance Imaging

scholarly journals Subjective Symptoms in Magnetic Resonance Imaging Personnel: A Multi-Center Study in Italy

2021 ◽  
Vol 9 ◽  
Author(s):  
Giulia Bravo ◽  
Alberto Modenese ◽  
Giulio Arcangeli ◽  
Chiara Bertoldi ◽  
Vincenzo Camisa ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
Low Frequency ◽  
Field Measurements ◽  
Annual Number ◽  
Time Varying ◽  
Subjective Symptoms ◽  
Resonance Imaging ◽  
Core Symptoms

Introduction: Magnetic Resonance Imaging (MRI) personnel have significant exposure to static and low-frequency time-varying magnetic fields. In these workers an increased prevalence of different subjective symptoms has been observed. The aim of our study was to investigate the prevalence of non-specific subjective symptoms and of “core symptoms” in a group of MRI personnel working in different centers in Italy, and of possible relationships with personal and occupational characteristics.Methods: The occurrence of 11 subjective symptoms was evaluated using a specific questionnaire with 240 subjects working in 6 different Italian hospitals and research centers, 177 MRI health care and research personnel and 63 unexposed subjects employed in the same departments. Exposure was subjectively investigated according to the type of MRI scanner (≤1.5 vs. ≥3 T) and to the number of MRI procedures attended and/or performed by the personnel, even if no information on how frequently the personnel entered the scanner room was collected. The possible associations among symptoms and estimated EMF exposure, the main characteristics of the population, and job stress perception were analyzed.Results: Eighty-six percent of the personnel reported at least one symptom; drowsiness, headache, and sleep disorders were the most frequent. The total number of symptoms did not differ between exposed persons and controls. Considering the total number of annual MRI procedures reported by the personnel, no significant associations were found nor with the total number of symptoms, nor with “core symptoms.” Only subjects complaining of drowsiness also reported a significantly higher mean annual number of MRI procedures with ≤ 1.5 T scanners when compared with exposed subjects without drowsiness. In a multivariate model, subjects with a high level of perceived stress complained of more symptoms (p = 0.0002).Conclusions: Our study did not show any association between the occurrence of reversible subjective symptoms, including the more specific “core symptoms,” and the occupational exposure of MRI personnel to static and low-frequency time-varying magnetic fields. On the other hand, the role played by occupational stress appears to be not negligible. In further research in this field, measurements of EMF exposure should be considered.

scholarly journals Magnetic resonance imaging of time-varying magnetic fields from therapeutic devices

2013 ◽  
pp. n/a-n/a ◽  
Author(s):  
Luis Hernandez-Garcia ◽  
Vivek Bhatia ◽  
Krishan Prem-Kumar ◽  
Magnus Ulfarsson
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
Time Varying ◽  
Resonance Imaging

Interactions of magnetic resonance imaging radio frequency magnetic fields with elongated medical implants

2000 ◽  
Vol 87 (9) ◽  
pp. 6188-6190 ◽  
Author(s):  
Chris D. Smith ◽  
Alexander V. Kildishev ◽  
John A. Nyenhuis ◽  
Kirk S. Foster ◽  
Joe D. Bourland
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Magnetic Fields ◽  
Radio Frequency ◽  
Medical Implants ◽  
Resonance Imaging

scholarly journals Identification of Methamphetamine Abstainers by Resting-State Functional Magnetic Resonance Imaging

2021 ◽  
Vol 12 ◽  
Author(s):  
Tingting Dong ◽  
Qiuping Huang ◽  
Shucai Huang ◽  
Jiang Xin ◽  
Qiaolan Jia ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Functional Magnetic Resonance Imaging ◽  
Time Domain ◽  
Resting State ◽  
Time Varying ◽  
Functional Magnetic Resonance ◽  
Resonance Imaging ◽  
Normal People ◽  
The Time Domain

Methamphetamine (MA) can cause brain structural and functional impairment, but there are few studies on whether this difference will sustain on MA abstainers. The purpose of this study is to investigate the correlation of brain networks in MA abstainers. In this study, 47 people detoxified for at least 14 months and 44 normal people took a resting-state functional magnetic resonance imaging (RS-fMRI) scan. A dynamic (i.e., time-varying) functional connectivity (FC) is obtained by applying sliding windows in the time courses on the independent components (ICs). The windowed correlation data for each IC were then clustered by k-means. The number of subjects in each cluster was used as a new feature for individual identification. The results show that the classifier achieved satisfactory performance (82.3% accuracy, 77.7% specificity, and 85.7% sensitivity). We find that there are significant differences in the brain networks of MA abstainers and normal people in the time domain, but the spatial differences are not obvious. Most of the altered functional connections (time-varying) are identified to be located at dorsal default mode network. These results have shown that changes in the correlation of the time domain may play an important role in identifying MA abstainers. Therefore, our findings provide valuable insights in the identification of MA and elucidate the pathological mechanism of MA from a resting-state functional integration point of view.

Sign in / Sign up

Export Citation Format

Share Document