SAR and temperature changes in the leg due to an RF decoupling coil at frequencies between 64 and 213 MHz

Journal of Magnetic Resonance Imaging

Volumn 12, Issue 1, 2000, Pages 68-74

  Hand, Jeffrey W ^a   Lagendijk, Jan J W ^b   Hajnal, Joseph V ^a   Lau, Raymond W ^c   Young, Ian R ^a  

^a HAMMERSMITH HOSPITAL   (United Kingdom)

^b UNIVERSITY MEDICAL CENTER UTRECHT   (Netherlands)

^c Microwave Consultant   (China)

Author keywords

FDTD; MR safety; RF absorbed power; Thermal model

Indexed keywords

ABSORPTION; ARTICLE; CONTROLLED STUDY; ELECTROMAGNETIC FIELD; HEAT TRANSFER; LEG; NUCLEAR MAGNETIC RESONANCE; PRIORITY JOURNAL; RADIOFREQUENCY; SAFETY; TEMPERATURE;

ABSORPTION; BODY TEMPERATURE REGULATION; ELECTROMAGNETIC FIELDS; HEAT; HUMANS; LEG; MAGNETIC RESONANCE IMAGING; MODELS, BIOLOGICAL; MUSCLE, SKELETAL; PHANTOMS, IMAGING; RADIO WAVES; SENSITIVITY AND SPECIFICITY; THERMOGRAPHY;

EID: 0033945857     PISSN: 10531807     EISSN: None     Source Type: Journal    
DOI: 10.1002/1522-2586(200007)12:1<68::AID-JMRI7>3.0.CO;2-2     Document Type: Article

References (28)

1. Keifer B, Grassner J, Haussmann R. Image acquisition in a second with half-Fourier-acquisition in a single-shot turbo spin echo. J Magn Reson Imaging 1994;4:86.
2. Semelka RC, Kelekis NL, Thomasson D, Brown MA, Laub GA. HASTE MR imaging: description of technique and preliminary results in the abdomen. J Magn Reson Imaging 1996;6:698-699.
3. 13C MRS. Magn Reson Med 1998;39:642-646.
4. th Scientific Meeting, 1998. p 650.
5. deSouza NM, Hall AS, Puni R, et al. High resolution magnetic resonance of the anal sphincter using a dedicated endorectal coil: comparison of MR imaging with surgical findings. Dis Colon Rectum 1996;39:926-934.
6. Robitaille PM, Abduljalil AM, Kangarlu A, et al. Human magnetic resonance imaging at 8 T. NMR Biomed 1988;11:263-265.
7. Simunic D, Wach P, Renhart W, Stollberger R. Spatial distribution of high-frequency electromagnetic energy in human head during MRI: numerical results and measurements. IEEE Trans Biomed Eng 1996;43:88-93.
8. Jin JM, Chen J, Chew WC, et al. Computation of electromagnetic fields for high-frequency magnetic resonance imaging applications. Phys Med Biol 1996;41:2719-2738.
9. 1-field inhomogeneity of shielded RF coils loaded with the human head. IEEE Trans Biomed Eng 1998;45:650-659.
10. 1 field distributions in a heterogeneous human head model with a birdcage coil. Magn Reson Med 1998;40:847-856.
11. Gandhi OP, Chen XB. Specific absorption rates and induced current densities for an anatomy-based model of the human for exposure to time-varying magnetic fields of MRI. Magn Reson Med 1999;41:816-823.
12. th Scientific Meeting, Philadelphia, 1999. Abstract #417.
13. th Scientific Meeting, Philadelphia, 1999. Abstract #418
14. Hand JW, Lau RW, Lagendijk JJW, et al. Electromagnetic and thermal modeling of SAR and temperature fields in tissue due to an RF decoupling coil. Magn Reson Med 1999;42:183-192.
15. Food and Drug Administration. Guidance for the submission of premarket notifications for magnetic resonance diagnostic devices. Rockville MD: Center for Devices and Radiological Health; 1998.
16. International Electrotechnical Committee. Medical electrical equipment - Part 2: Particular requirements for the safety of magnetic resonance equipment for medical diagnosis. IEC 601-2-33, 1995. Geneva: IEC; 1995.
17. NRPB (National Radiological Protection Board). Limits on patient and volunteer exposure during clinical magnetic resonance diagnostic procedures. Documents of the NRPB 1991;2:5-29.
18. IRPA/INIRC (International Radiation Protection Association/International Non-ionizing Radiation Committee). Protection of the patient undergoing a magnetic resonance examination. Health Phys 1991;61:923-928.
19. Yee KS. Numerical solution of initial boundary value problems involving Maxwell's equations in isotropic media. IEEE Trans Antennas Propag 1966;14:302-307.
20. Taflove A. Computational electrodynamics - the finite-difference time-domain method. Boston: Artec House; 1995
21. Han Y, Wright SM. Analysis of RF penetration effects in MRI using finite difference time domain method. In: Proceedings of the SMRM 12th Annual Meeting, 1993. p 1327
22. Taylor HC, Burl M, Hand JW. Experimental verification of numerically predicted electric field distributions produced by a radiofrequency coil. Phys Med Biol 1997;42:1395-1402.
23. Gabriel S, Lau RW, Gabriel C. The dielectric properties of biological tissues: III. parametric models for the dielectric spectrum of tissues. Phys Med Biol 1996;41:2271-2293.
24. Mur G. Absorbing boundary conditions for the finite-difference approximation of time-domain electromagnetic field equations. IEEE Trans Electromagn Compatibility 1981;23:377-382.
25. Pennes HH. Analysis of tissue and arterial blood temperature in the resting human forearm. J Appl Physiol 1948;1:93-122.
26. Hand JW, Ledda JL, Evans NTS. Considerations of radiofrequency induction heating for localised hyperthermia. Phys Med Biol 1982; 27:1-16.
27. Gandhi OP, Chen JY. Absorption and distribution patterns of RF fields. In: Biological effects and safety aspects of nuclear magnetic imaging and spectroscopy. Ann NY Acad Sci 1992;649:242-257.
28. Röschmann P. Radiofrequency penetration and absorption in the human body: limitations to high-field whole-body nuclear magnetic resonance imaging. Med Phys 1987;14:922-931.