A novel total variation based ring artifact suppression method for CBCT imaging with two-dimensional antiscatter grids

Medical Physics
Timur AlexeevCem Altunbas

Abstract

Two-dimensional antiscatter grids (2DASG) for cone beam computed tomography (CBCT) is a new area of research to reduce scatter intensity, and consequently improve CBCT image quality. One of the challenges in implementation of 2DASGs is their septa shadows that are impinged on the projections. If these artifacts are not corrected, they may lead to ring artifacts in CBCT images. In this work, we present a novel method to suppress ring artifacts in FPD-based CBCT images. Briefly, our method first detects the locations of 2DASG's septa shadows in projections and then, reduces projection pixel values in septa shadows iteratively until a residual-based convergence criterion is met. To suppress the 2DASG's septa shadows, we developed a total variation minimization (TVM) formulation, referred to as adaptive-diffusive total variation minimization (adTVM), where the diffusivity regularization parameter was adaptively adjusted during each iteration based on the magnitude of the local pixel gradients. To test our method, we have acquired CBCT scans of phantoms using three 2DASG prototypes with different grid geometries. Projections were acquired with a linac mounted CBCT system, operated in offset detector geometry. These projections were ...Continue Reading

References

Sep 11, 2004·Physics in Medicine and Biology·Jan Sijbers, Andrei Postnov
Feb 5, 2008·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Marius LysakerXue-Cheng Tai
Dec 11, 2006·Optics Express·Mirko Boin, Astrid Haibel
Dec 25, 2009·Computers in Biology and Medicine·Fazle SadiMd Kamrul Hasan
Jun 3, 2011·IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society·Stanley H ChanTruong Q Nguyen

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Citations

Oct 5, 2019·Physics in Medicine and Biology·Cem AltunbasBrian Kavanagh

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