3 October 2016 Low-dose multiphase abdominal CT reconstruction with phase-induced swap prior
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Abstract
Multiphase abdominal CT is an imaging protocol in which the patient is scanned at different phases before and after the injection of a contrast agent. Reconstructed images with different concentrations of contrast material provide useful information for effective detection of abnormalities. However, several scanning during a short period of time eventually increase the patient radiation dose to a remarkable value up to a risky level. Reducing the patient dose by modulating the x-ray tube current or acquiring the projection data through a small number of views are known to degrade the image quality and reduce the possibility to be useful for diagnosis purpose. In this work, we propose a novel multiphase abdominal CT imaging protocol with patient dose reduction and high image quality. The image reconstruction cost function consists of two terms, namely the data fidelity term and penalty term to enforce the anatomical similarity in successive contrast phase reconstruction. The prior information, named phase-induced swap prior (PISP) is computed using total variation minimization of image acquired from different contrast phases. The new method is evaluated through a simulation study using digital abdominal phantom and real data and results are promising.
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Mona Selim, Essam A. Rashed, Hiroyuki Kudo, "Low-dose multiphase abdominal CT reconstruction with phase-induced swap prior", Proc. SPIE 9967, Developments in X-Ray Tomography X, 99671P (3 October 2016); doi: 10.1117/12.2237110; https://doi.org/10.1117/12.2237110
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