Numerical calculations of switched magnetic field gradients during magnetic resonance imaging.
During magnetic resonance imaging (MRI) pulse-sequences the human body is exposed to switched magnetic gradient fields. These gradients become stronger and are switched faster for fast imaging. Effects resulting from these fields with trapezoidal waveforms are on the one hand sensory perception of induced currents and on the other hand muscular and cardiac stimulation. All three components of the current density induced by gradient pulse sequence were analysed in a high-resolution model of the human torso. The evaluation of the calculated data was performed thoroughly in the region of the heart muscle of the torso model to find out how different waveforms of the switched gradient field influence strength and direction of induced currents.
Rick
J
J
Institut für Biomedizinische Technik, Universität Karlsruhe (TH), Deutschland. jochen.rick@ibt.uni-karlsruhe.de
Golombeck
M A
MA
Dössel
O
O
D004562:Electrocardiography / Q000528:radiation effects*; D004574:Electromagnetic Fields / Q000009:adverse effects*; D005583:Fourier Analysis; D006321:Heart / Q000528:radiation effects*; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000009:adverse effects* / Q000706:statistics & numerical data; D008953:Models, Anatomic; D008962:Models, Theoretical; D009716:Numerical Analysis, Computer-Assisted; D012306:Risk