Lorentz-force-induced motion in conductive media

被引:12
作者
Basford, AT
Basford, JR [1 ]
Kugel, J
Ehman, RL
机构
[1] Univ Minnesota, Dept Neurosci, Minneapolis, MN 55455 USA
[2] Mayo Clin & Mayo Fdn, Dept Phys Med & Rehabil, Rochester, MN 55905 USA
[3] Mayo Clin & Mayo Fdn, Dept Radiol, Magnet Resonance Imaging Lab, Rochester, MN 55905 USA
关键词
MRI; Lorentz force; imaging; electrical current;
D O I
10.1016/j.mri.2005.02.014
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
This project was designed to assess whether MRI imaging could detect Lorentz-force-induced motion in conductive samples. Experiments were performed by applying alternating voltages across 2 % agar and 18 % bovine gels placed in the field of a 1.5-T MRI scanner. Motion-sensitized time-gated MRI images that were obtained and analyzed with custom-developed software used in previous studies revealed the production of movement in both agar and gel samples. Motion was most pronounced in the plane vertical to the sample and had the greatest amplitude when the current path was perpendicular to the scanner's magnetic field. These findings are compatible with the vector cross product nature of the Lorentz force and suggest that the imaging of Lorentz-force-induced motion in conductive samples is feasible. Whether this approach can be extended to study electrically active tissues such as the peripheral nerves, brain and heart remains to be seen. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:647 / 651
页数:5
相关论文
共 17 条
[1]   Magnetic resonance current density imaging of chemical processes and reactions [J].
Beravs, K ;
Demsar, A ;
Demsar, F .
JOURNAL OF MAGNETIC RESONANCE, 1999, 137 (01) :253-257
[2]  
Dresner MA, 2001, J MAGN RESON IMAGING, V13, P269, DOI 10.1002/1522-2586(200102)13:2<269::AID-JMRI1039>3.3.CO
[3]  
2-T
[4]   INVIVO DETECTION OF APPLIED ELECTRIC CURRENTS BY MAGNETIC-RESONANCE IMAGING [J].
JOY, M ;
SCOTT, G ;
HENKELMAN, M .
MAGNETIC RESONANCE IMAGING, 1989, 7 (01) :89-94
[5]   Imaging of current density and current pathways in rabbit brain during transcranial electrostimulation [J].
Joy, MLG ;
Lebedev, VP ;
Gati, JS .
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, 1999, 46 (09) :1139-1149
[6]   Tissue characterization using magnetic resonance elastography: preliminary results [J].
Kruse, SA ;
Smith, JA ;
Lawrence, AJ ;
Dresner, MA ;
Manduca, A ;
Greenleaf, JF ;
Ehman, RL .
PHYSICS IN MEDICINE AND BIOLOGY, 2000, 45 (06) :1579-1590
[7]  
MIKAC U, 2001, P INT SOC MAGN RESON, P9
[8]  
Müller HP, 1999, J MED ENG TECHNOL, V23, P108, DOI 10.1080/030919099294258
[9]   MAGNETIC-RESONANCE ELASTOGRAPHY BY DIRECT VISUALIZATION OF PROPAGATING ACOUSTIC STRAIN WAVES [J].
MUTHUPILLAI, R ;
LOMAS, DJ ;
ROSSMAN, PJ ;
GREENLEAF, JF ;
MANDUCA, A ;
EHMAN, RL .
SCIENCE, 1995, 269 (5232) :1854-1857
[10]   SENSITIVITY OF MAGNETIC-RESONANCE CURRENT-DENSITY IMAGING [J].
SCOTT, GC ;
JOY, MLG ;
ARMSTRONG, RL ;
HENKELMAN, RM .
JOURNAL OF MAGNETIC RESONANCE, 1992, 97 (02) :235-254