Numerical field evaluation of healthcare workers when bending towards high-field MRI magnets

Magnetic Resonance in Medicine

Volumn 59, Issue 2, 2008, Pages 410-422

  Wang, H ^a   Trakic, A ^a   Liu, F ^a   Crozier, Stuart ^a  

^a UNIVERSITY OF QUEENSLAND   (Australia)

Author keywords

Electric field; Gradient coil; Human model; MRI; Superconducting magnet

Indexed keywords

CURRENT DENSITY; ELECTRIC FIELDS; ELECTROMAGNETIC FIELD EFFECTS; HEALTH CARE; LAWS AND LEGISLATION; MAGNETIC RESONANCE IMAGING; MAGNETS; SUPERCONDUCTING COILS;

DYNAMIC MAGNETIC FIELDS; FIELD EVALUATION; GRADIENT COIL; HEALTHCARE WORKERS; HUMAN MODEL; PHYSICAL AGENTS; PULSED MAGNETIC FIELDS; STATIC MAGNETIC FIELDS;

SUPERCONDUCTING MAGNETS;

ARTICLE; BODY MOVEMENT; ELECTRIC CURRENT; ELECTRIC FIELD; HEALTH CARE PERSONNEL; HUMAN; MAGNET; MAGNETIC FIELD; MATHEMATICAL ANALYSIS; NUCLEAR MAGNETIC RESONANCE IMAGING; OCCUPATIONAL EXPOSURE; SIMULATION;

EID: 38949101120     PISSN: 07403194     EISSN: 15222594     Source Type: Journal    
DOI: 10.1002/mrm.21441     Document Type: Article

References (32)

1. Schenck JF. Safety of strong, static magnetic fields. J. Magn Reson Imaging 2000;12:2-19.
2. Andriola Silva AK, Silva EL, Egito EST, Carrico AS. Safety concerns related to magnetic field exposure. Radiat Environ Biophys 2006;45:245-252.
3. Gowland PA. Present and future magnetic resonance sources of exposure to static fields. Prog Biophys Mol Biol 2005;87:175-183.
4. van Deventer TE, Saunders R, Repacholi MH. WHO health risk assessment process for static fields. Prog Biophys Mol Biol 2005;87:355-363.
5. Miyakoshi J. Effects of static magnetic fields at the cellular level. Prog Biophys Mol Biol 2005;87:213-223.
6. Jeheson P, Duboc D, Lavergne T, Guize L, Guerin F, Degeorges M, Syrota A. Change in human cardiac rhythm induced by a 2-T static magnetic field. Radiology 1988;166:227-230.
7. Keltner JR, Roos MS, Brakeman PR, Budinger TF. Magnetohydrodynamics of blood flow. Magn Reson Med 1990;16:139-149.
8. Dorfman YG. Physical phenomena occurring in live objects under the effect of constant magnetic fields. In: Kholodov YA, editor. Influence of magnetic field on biological objects. Springfield, VA: National Technical Information Service, Report JPRS63038; 1971. p 11-19.
9. Crozier S, Liu F. Numerical evaluation of the fields caused by body motion in or near high-field MRI scanners. Prog Biophys Mol Biol 2005;87:267-278.
10. International Commission on Non-Ionizing Radiation Protection (ICNIRP). Guidelines for limiting exposure to time varying electric, magnetic and electromagnetic fields (up to 300 GHz). Health Phys 1998;74:494-522.
11. The Institute of Electrical and Electronics Engineers (IEEE). C95.6: Standard for safety levels with respect to human exposure to electromagnetic fields (0-3 kHz). New York: IEEE; 2002.
12. Health and Safety Executive. RR570 report: assessment of electromagnetic fields around magnetic resonance imaging (MRI) equipment. HSE Books; May, 2007.
13. Purves, Ausustine GJ, Fitzpatrick D, Katz LC, LaMantia A-S, McNamara JO. Neuroscience. Sunderland, MA: Sinauer; 1997.
14. Budinger TF, Fischer H, Hentschel D, Reinfelder H, Schmitt F. Physiological effects of fast oscillating magnetic field gradients, J Comput Assist Tomogr 1991;15:909-914.
15. Cohen MS, Weisshoff RM, Rzedzian RR, Kantor HC. Sensory stimulation by timevarying magnetic fields. Magn Reson Med 1990;14:409-414.
16. Mao WH, Chronik BA, Feldman RE, Smith MB, Collins CM. Consideration of magnetically-induced and conservative electric fields within a loaded gradient coil. Magn Reson Med 2006;55:1424-1432.
17. Schaefer DJ, Bourland JD, Nyenhuis JA. Review of patient safety in time-varying gradient fields, Jl. Magn Reson Imaging 2000;12:20-29.
18. Mansfield P, Harvey PR. Limits to neural stimulation in echo-planar imaging. Magn Reson Med 1993;29:746-758.
19. Liu F, Zhao HW, Crozier S. On the induced electric field gradients in the human body for magnetic stimulation by gradient coils in MRI. IEEE Trans Biomed Eng 2003;50:804-815.
20. Directive 2004/40/EC of the European Parliament and of the Council. Official Journal of the European Union, L 159, 2004.
21. Cheng Y-CN, Eagan TP, Brown RW, Shvartsman SM, Thompson MR. Design of actively shielded main magnets: an improved functional method. MAGMA 2003;16:57-67.
22. Dimbylow PJ. Current densities in a 2 mm resolution anatomically realistic model of the body induced by low frequency electric fields. Phys Med Biol 2000;45:1013-1022.
23. Dimbylow PJ. Development of the female voxel phantom, NAOMI, and its application to calculations of induced current densities and electric fields from applied low frequency magnetic and electric fields. Phys Med Biol 2005;50:1047-1070.
24. Gabriel C, Gabriel S, Corthout E. The dielectric properties of biological tissues: I. Literature survey. Phys Med Biol 1996;41:2231-2249.
25. Gabriel S, Lau RW, Gabriel C. The dielectric properties of biological tissue: II. Measurements in the frequency range 10 Hz to 20 GHz. Phys Med Biol 1996;41:2251-2269.
26. Forbes LK, Crozier S, Doddrell DM. Rapid computation of static fields produced by thick circular solenoids. IEEE Trans Magn 1997;33:4405-4410.
27. Liu F, Crozier S, Zhao H, Lawrence B. Finite-difference time-domain-based studies of MRI pulsed field gradient-induced eddy currents inside the human body. Concepts Magn Reson 2002;15:26-36.
28. Liu F, Crozier S. Electromagnetic fields inside a lossy, multilayered spherical head phantom excited by MRI coils, models and methods. Phys Med Biol 2004;49:1835-1851.
29. Dawson TW, Caputa K, Stuchly MA. Magnetic field exposures for UK live-line workers. Phys Med Biol 2002;47:995-1012.
30. Mason PA, Ziriax JM, Hurt WD, Gajcek P. Averaging mass used for SAR-based standards: one gram or 10 grams? That is the question. US Air Force Workshop: A Forum on EMF Safety Standards and Science, Munich, Germany, 2000.
31. Dawson TW, Stuchly MA. High-resolution organ dosimetry for human exposure to low-frequency magnetic fields. IEEE Trans Magn 1998;34:708-771.
32. Yamazaki K, Hirosato S, Muramatu K, Hirayama M, Kamata K, Onoki T, Kobayashi K, Haga A, Katada K, Kinomura Y, Kuwayama Y. Open-type magnetically shielded room using only canceling coil without a ferromagnetic wall for magnetic resonance imaging. IEEE Trans Magn 2007;43:2480-2482.