نتایج جستجو برای: optical tracking
تعداد نتایج: 376766 فیلتر نتایج به سال:
Real-time optical surface imaging systems offer a non-invasive way to monitor intra-fraction motion of a patient's thorax surface during radiotherapy treatments. Due to lack of point correspondence in dynamic surface acquisition, such systems cannot currently provide 3D motion tracking at specific surface landmarks, as available in optical technologies based on passive markers. We propose to ap...
We are working to develop beating-heart atrial septal defect (ASD) closure techniques using real-time 3-D ultrasound guidance. The major image processing challenges are the low image quality and the high frame rate. This paper presents comparative results for ASD tracking in sequences of 3D cardiac ultrasound. We introduce a block flow technique, which combines the velocity computation from opt...
We study optical trapping of nanotubes and graphene. We extract the distribution of both centre-of-mass and angular fluctuations from three-dimensional tracking of these optically trapped carbon nanostructures. The optical force and torque constants are measured from auto and cross-correlation of the tracking signals. We demonstrate that nanotubes enable nanometer spatial, and femto-Newton forc...
Abstract To better understand the complex dynamics and physics associated with rapid expansion of detonation product fireball following an explosion, it is imperative to have a full description its velocity field. Typical experimental techniques rely on simple single-point measurements captured from pressure transducers or Hopkinson bars. In this technical design note, we aim improve current st...
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