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Ion CT image acquisition and reconstruction

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RNTW03 - New tomographic methods using particles

For treatment planning in ion beam therapy, the dose distribution within a patient is typically calculated using a preceding x-ray CT scan. The scan is given in Hounsfield units which must be converted to stopping powers (SP) that correspond to the energy loss per unit path length of an ion in matter. A possible solution to avoid range errors in the calculated dose distribution arising from this conversion is given by directly measuring the planning CT with ions. However, ion paths in matter are affected by multiple Coulomb scattering and show substantial deviations from a straight line path. This has to be accounted for in the image reconstruction process. A typical ion CT (iCT) setup therefore consists of two particle trackers to measure positions and directions of single ions upstream and downstream the patient or a phantom. The residual particle energy is usually measured with a calorimeter or range telescope.  At TU Wien/HEPHY, a demonstrator system for iCT was developed and tested at MedAustron. Measurement results with this demonstrator were complemented by using data from Monte Carlo simulations. For image reconstruction, the open-source TIGRE toolbox was modified for the purpose of ion imaging. In this talk, the basic principles of imaging with with ions will be discussed. Measurement results acquired with the demonstrator system and reconstruction results will be shown.

This talk is part of the Isaac Newton Institute Seminar Series series.

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