Item Details

abstract

In cone beam computed tomography (CBCT) with a large subject volume within the x-ray field, the measured signal can be contaminated by a large amount of scattered photons due to x-ray interactions with the irradiated object. The photon scatter can severely degrade the quality of the reconstructed CT images by creating artifacts and quantification errors. Thus scatter correction has become an important processing step for improving image fidelity in CBCT. Algorithm-based methods proposed in the literature include analytical calculations, Monte Carlo (MC) simulations and superposition calculations. Analytical and MC methods apply well-established physical models describing scattering interactions to accurately calculate or simulate scatter profiles. The prevailing challenge is the expensive computation cost inherently required. Superposition methods use simplified object models and are computationally efficient. But the detailed object information is not considered and inferior accuracy can occur. Therefore, an optimal method with balanced performance in computation speed and accuracy is of investigational and practical interest.

subject

Compton scattering

computed tomorgraphy

Monte Carlo

simulation

X-ray scatter

contributor

Liu, Jie (author)

Bourland, Daniel J (committee chair)

Munley, Michael T (committee member)

Cho, Samuel (committee member)

Guthold, Martin (committee member)

Holzwarth, Natalie AW (committee member)

date

2015-08-25T08:35:36Z (accessioned)

2015 (issued)

degree

Physics (discipline)

10000-01-01 (liftdate)

embargo

forever (terms)

identifier

http://hdl.handle.net/10339/57268 (uri)

language

en (iso)

publisher

Wake Forest University

title

X-ray Scatter Computation and Simulation in Cone Beam Computed Tomography

type

Dissertation