Magnetic motion trackers have been widely used for tracking user head / hand pose information owing to their advantages such as size, occlusion-less tracking environment and high sample rate. Yet, issues such as latency and jitter leave magnetic tracker technology unfavorable as compared to other tracker technologies. While latency is due to tracker hardware employed, jitter is due to magnetic ...

We present two different methods for calibrating 3D swept-volume ultrasound as a prerequisite for an ultrasound based intraoperative navigation system. Different solutions of the calibration problem for 2D ultrasound exist, but no approach has been published so far that takes advantage of 3D swept-volume ultrasound. In contrast to 3D freehand ultrasound no compounding has to be performed. Inste...

A unique in situ calibration technique has been used to spatially calibrate and characterize the extensive new magnetic diagnostic set and close-fitting conducting wall of the High Beta Tokamak-Extended Pulse (HBT-EP) experiment. A new set of 216 Mirnov coils has recently been installed inside the vacuum chamber of the device for high-resolution measurements of magnetohydrodynamic phenomena inc...

Due to low fluorine background signal in vivo, 19F is a good marker to study the fate of exogenous molecules by magnetic resonance imaging (MRI) using equilibrium nuclear spin polarization schemes. Since 19F MRI applications require high sensitivity, it can be important to assess experimental feasibility during the design stage already by estimating the minimum detectable fluorine concentration...

The accuracy of magnetic heading sensor is reduced by the impact of manufacturing technology and local magnetic interferences. The singularity of constraint matrix in traditional calibration algorithm leads to unstable results. Therefore, an improved least-square ellipsoid fitting method is proposed in this paper. The error source and the deviation mathematical model are introduced. On the basi...

a new method for analysis of trace amount of rh(iii) ions by magnetic activated carbon modified with 2,3,5,6-tetra(2-pyridyl)pyrazine (mac/tppz) as the magnetic sorbent has been proposed. the proposed adsorbent was found to be advantageous over conventional solid phase extraction (spe) in terms of operational simplicity and low time-consuming. the experimental parameters affecting the extractio...

In augmented reality, the real world is augmented by virtual, computer generated objects. If real and virtual objects are not aligned properly, the experience of the user will not be satisfying, as the illusion of a common world consisting of both real and virtual objects will not be present. To achieve this precise alignment, it is necessary to track the user’s position and orientation with hi...

NASA’s Solar Dynamics Observatory (SDO) spacecraft was launched 11 February 2010 with three instruments onboard, including the Helioseismic and Magnetic Imager (HMI). After commissioning, HMI began normal operations on 1 May 2010 and has subsequently observed the Sun’s entire visible disk almost continuously. HMI collects sequences of polarized filtergrams taken at a fixed cadence with two 4096...