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SUMMARY:Image reconstruction from axially asymmetrically truncated cone be
 am projections  - Marta Betcke (UCL)
DTSTART:20131114T150000Z
DTEND:20131114T160000Z
UID:TALK47974@talks.cam.ac.uk
CONTACT:Carola-Bibiane Schoenlieb
DESCRIPTION:With the tightening security guidelines\, fully 3D cone beam C
 T scanners are gradually being introduced into airport checked-in baggage 
 screening systems. This presents new requirements on the scanning speed of
  cone beam systems\, which were originally developed with medical applicat
 ions in mind. The mechanical motion of the gantry is the main bottle neck 
 in increasing speed of measurements acquisition in state of the art cone b
 eam scanners. Therefore in the new generation of the cone beam systems the
  mechanically rotating gantry was replaced by a stationary ring of sources
 \, which can by quickly switched on and off by the on board electronics\, 
 and multiple stationary rings of detectors. While the new geometry is capa
 ble of nearly real time data acquisition it comes at the cost of asymmetri
 cal axial truncation of the cone beam projections and hence incompleteness
  of the data. In this talk we discuss rebinning methods for reconstruction
  from such axially truncated projections: constraint optimal surface rebin
 ning and a new family of methods\, multi-sheet surface rebinning methods.
LOCATION:MR 14\, CMS
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