Patent ID: 9274067
Filing Date: 2016-03-01
CPC Classification: A61B,G01N,G01T

Claim Text:
1. A computed tomography system comprising: a particle detection system comprising one or more detectors, the particle detection system configured to generate a signal in response to interaction between an ion and at least one of the one or more detectors; a calibration device comprising a plurality of degrader plates configured to be introduced into a beam of ions along a beam axis, the plurality of degrader plates in combination having a known water-equivalent thickness (WET) value; a processor configured to determine, for each of a plurality of ions that interact with the particle detection system: wherein the plurality of degrader plates has a first known WET value for a first path through the plurality of degrader plates and a second known WET value for a second path through the plurality of degrader plates, the first path and the second path being parallel to one another and offset from one another in a direction perpendicular to the beam axis.