A low dielectric constant customized phantom design to measure rf coil nonuniformity

Magnetic Resonance Imaging

Volumn 15, Issue 1, 1997, Pages 69-75

  Tofts, P S ^a   Barker, G J ^a   Dean, T L ^b   Gallagher, H ^a   Gregory, A P ^c   Clarke, R N ^c  

^a UNIVERSITY COLLEGE LONDON   (United Kingdom)

^b UNIVERSITY OF BRIGHTON   (United Kingdom)

^c NATIONAL PHYSICAL LABORATORY   (United Kingdom)

Author keywords

Dielectric constant; Head coil; Nonuniformity; Phantom; Relative permittivity; Test object

Indexed keywords

GLASS FIBER; OIL;

ARTICLE; CONTAINER; DIELECTRIC CONSTANT; LIQUID; MAGNETIC FIELD; PHANTOM; PRIORITY JOURNAL; RADIOFREQUENCY;

EID: 0030970880     PISSN: 0730725X     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0730-725X(96)00220-2     Document Type: Article

References (18)

1. 1. Condon, B.R.; Patterson, J.; Wyper, D.; Jenkins, A.; Hadley, D.M. Image non-uniformity in magnetic resonance imaging: its magnitude and methods for its correction. Br. J. Radiol. 60:83-87; 1987.
2. 2. Simmons, A.; Tofts, P.S.; Barker, G.J.; Wicks, D.A.G.; Arridge, S.R. Considerations for RF non-uniformity correction of spin-echo images at 1.5 T. Abstracts of the Society of Magnetic Resonance in Medicine, 11th Annual Meeting, Berlin, 2:4240; 1992.
3. 3. Wicks, D.A.G.; Barker, G.; Tofts, P.S. Correction of intensity non-uniformity in magnetic resonance images of any orientation. Magn. Reson. Imag. 11:183-196; 1993.
4. 4. Tofts, P.S.; Barker, G.J.; Simmons, A.M.K.; MacManus, D.; Thorpe, J.; Gass, A.; Miller, D.H. Correction of nonuniformity in images of the spine and optic nerve from fixed receive-only surface coils at 1.5T. J. Comput. Assist. Tomogr. 18:997-1003; 1994.
5. 5. Simmons, A.; Tofts, P.S.; Barker, G.J.; Arridge, S.R. Sources of intensity non-uniformity in spin echo images at 1.5 T. Magn. Reson. Med. 32: 32:1-128; 1994.
6. 6. Parker, G.J.M.; Rowland, I.J.; Collins, D.J.; Leach, M.O. Investigation of the factors affecting uniformity in test objects and the advantages of using polydimethylsiloxane (PDMS). Society of Magnetic Resonance 3rd Annual Meeting, San Francisco, 1994; p. 203.
7. 7. Leach, M.O.; Collins, D.J.; Keevil, S.; Rowland, I.; Smith, M.A.; Henriksen, O.; Bovee, W.M.M.J.; Podo, F. Quality assessment in in vivo NMR spectroscopy. III. Clinical test objects: Design, construction, and solutions. Magn. Reson. Imag. 13:131-137; 1995.
8. 8. Bottomley, P.A.; Andrew, E.R. RF magnetic field penetration, phase shift and power dissipation in biological tissue: implications for NMR imaging. Phys. Med. Biol. 23:630-643; 1978.
9. 9. Glover, G.H.; Haynes, C.E.; Pelc, N.J.; Edelstein, W.A.; Mueller, O.M.; Hart, H.R.; Hardy, C.J.; O'Donnel, M.; Barber, W.D. Comparison of linear and circular-polarization for magnetic resonance imaging. J. Magn. Reson. 64:255-270; 1985.
10. 10. Foo, T.K.F.; Hayes, C.E.; Kang, Y. An analytical model for the design of RF resonantors for MR body imaging. Magn. Reson. Med. 21:165-1177; 1991.
11. 11. Maryanski, M.J.; Gore, J.C. Flip angle variations in large volumes of dielectric and conductive media at high fields: implications for quantization of relaxation times from images. Abstracts of the Society of Magnetic Resonance in Medicine, 11th Annual Meeting, Berlin, Workin-progress: 1349; 1992.
12. 12. Maryanski, M.J.; Schulz, R.J.; Ibbott, G.S.; Gatenby, J.C.; Xiel, J.; Horton, D.; Gore, J.C. Magnetic resonance imaging of radiation dose distributions using a polymergel dosimeter. Phys. Med. Biol. 39:1437-1455; 1994.
13. 13. Tofts, P.S. Standing waves in uniform water phantoms. J. Magn. Reson. series B 104:143-147; 1994.
14. 14. Jenkins, S.; Hodgetts, T.E.; Clark, R.N.; Preece, A.W. Dielectric measurements on reference liquids using automatic network analysers and calculable geometries. Meas. Sci. Technol. 1:691-702; 1990.
15. 15. Weast, R.C.; Astle, M.J. (Eds). CRC Handbook of Chemistry and Physics, 63rd edition. Boca Raton, FL: CRC Press; 1982: p. E-52.
16. 16. Lynch, A.C. Relationship between permittivity and loss tangent. Proc. IEE 118:244-246; 1970.
17. 17. Kaye, G.W.C.; Laby, T.H. Tables of Physical and Chemical Constants and Some Mathematical Functions, 12th edition. London: Longmans Green and Co.; 1959: p. 55.
18. 18. Atkins, P.W. Physical Chemistry, 5th edition. Oxford: Oxford University Press; 1994.