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SUMMARY:Ion CT image acquisition and reconstruction - Stefanie Kaser (ETH 
 Zürich)
DTSTART:20230516T090000Z
DTEND:20230516T100000Z
UID:TALK198097@talks.cam.ac.uk
DESCRIPTION:For treatment planning in ion beam therapy\, the dose distribu
 tion within a patient is typically calculated using a preceding x-ray CT s
 can. The scan is given in Hounsfield units which must be converted to stop
 ping powers (SP) that correspond to the energy loss per unit path length o
 f an ion in matter. A possible solution to avoid range errors in the calcu
 lated dose distribution arising from this conversion is given by directly 
 measuring the planning CT with ions. However\, ion paths in matter are aff
 ected by multiple Coulomb scattering and show substantial deviations from 
 a straight line path. This has to be accounted for in the image reconstruc
 tion process.\nA typical ion CT (iCT) setup therefore consists of two part
 icle trackers to measure positions and directions of single ions upstream 
 and downstream the patient or a phantom. The residual particle energy is u
 sually measured with a calorimeter or range telescope.&nbsp\;\nAt TU Wien/
 HEPHY\, a demonstrator system for iCT was developed and tested at MedAustr
 on. Measurement results with this demonstrator were complemented by using 
 data from Monte Carlo simulations. For image reconstruction\, the open-sou
 rce TIGRE toolbox was modified for the purpose of ion imaging.\nIn this ta
 lk\, the basic principles of imaging with with ions will be discussed. Mea
 surement results acquired with the demonstrator system and reconstruction 
 results will be shown.
LOCATION:Seminar Room 1\, Newton Institute
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