Laura Bortolotti1 and Richard Bowtell1
1Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, United Kingdom
1Sir Peter Mansfield Imaging Centre, University of Nottingham, Nottingham, United Kingdom
Using simulations, we show that changes in head pose can be accurately
estimated from measurements of the fields at 16 field probe positions due to
currents pulsed in small coils attached to the head.
The figure shows the simulated experimental set-up. Two coils are fixed onto the end-pieces of a pair of glasses. Each solenoidal coil was composed of 100 turns of 0.25mm- diameter wire arranged in 10 layers radially, each formed from 10 turns. The left and right coils are oriented along the y- and z-axes, respectively. The z-component of the magnetic field from the coils is monitored using 16 field probes spanning 21 cm axially and 22 cm azimuthally.
Coil positions (top) and z-component of the magnetic field4 on a cylindrical surface (bottom, BC ) (0.3A coil current). Probe positions are highlighted using circles (top) or line crossings (bottom). The field at the initial head-position is shown (left), along with the field changes produced by head pose changes during head nodding (middle) and head shaking (left) (motion parameters shown in Figure 3. Complex patterns of field change give high sensitivity to differences in motion.
