Optimization for customized trajectories in Cone Beam Computed Tomography

Medical Physics
Sepideh HatamikiaWolfgang Birkfellner

Abstract

We developed a target-based cone beam computed tomography (CBCT) imaging framework for optimizing an unconstrained three dimensional (3D) source-detector trajectory by incorporating prior image information. Our main aim is to enable a CBCT system to provide topical information about the target using a limited angle non-circular scan orbit with a minimal number of projections. Such a customized trajectory should include enough information to sufficiently reconstruct a particular volume of interest (VOI) under kinematic constraints which may result from the patient size or additional surgical or radiation therapy related equipment. A patient specific model from a prior diagnostic computed tomography (CT) volume is used as a digital phantom for CBCT trajectory simulations. Selection of the best projection views is accomplished through maximizing an objective function fed by the imaging quality provided by different x-ray positions on the digital phantom data. The final optimized trajectory includes a limited angular range and a minimal number of projections which can be applied to a C-arm device capable of general source-detector positioning. The performance of the proposed framework is investigated in experiments involving an in-...Continue Reading

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Citations

Apr 14, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Stefanie KaserFelix Ulrich-Pur

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Software Mentioned

Tomographic Iterative GPU based Reconstruction ( TIGRE )
TIGRE
ASD
POCS

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