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Directional View Interpolation for Compensation of Sparse Angular Sampling in Cone-Beam CT

A novel dedicated shape-driven directional interpolation algorithm based on a structure tensor approach is developed that clearly outperforms conventional scene-based interpolation schemes in flat detector cone-beam computed tomography applications.
IEEE (opens in a new tab)

Projection extension for region of interest imaging in cone-beam CT.

The presented technique enables almost artifact-free 3D ROI imaging during interventions and allows for repeated scans at low dose and enables intraprocedural imaging of large objects even with a small detector.
PubMed (opens in a new tab)

Scattered radiation in cone beam computed tomography : analysis, quantification and compensation

3D image quality is improved in order to extend the imaging capability to high quality low contrast imaging with C-arm X-ray systems and scattered radiation is a major source of image degradation and nonlinearity in flat-detector based CBCT.

Soft-tissue contrast resolution within the head of human cadaver by means of flat-detector-based cone-beam CT

To reduce cupping artifacts resulting from scattered radiation and to improve visibility of low contrast details, a novel homogenization procedure based on segmentation and polynomial fitting has been developed and applied on the reconstructed voxel data.
SPIE (opens in a new tab)

Motion compensation for cone-beam CT based on 4D motion field of sinogram tracked markers

A new method for motion estimation and motion-compensated reconstruction for volume CT imaging and results for rigid body motion as well as simulation results for a breathing thorax model are presented.
Publisher (opens in a new tab)

Performance simulation of an x-ray detector for spectral CT with combined Si and Cd[Zn]Te detection layers

The combination of top detector layers made of Si with lower layersmade of Cd[Zn]Te is studied by using Monte Carlo simulated detector responses and it is found that the inter-pixel cross-talk due to Compton scatter is indeed very high; however, with an appropriate cross- talk correction scheme, which is also described, the negative effects ofCross-talk are shown to be removed to a very large extent.
IOP Publishing (opens in a new tab)

Model based scatter correction for cone-beam computed tomography

A fast model based scatter correction algorithm is proposed, aiming at accurately estimating the level and spatial distribution of scattered radiation background in each projection, which will allow for effectively reducing streak and cupping artifacts due to scattering in cone-beam CT applications.
SPIE (opens in a new tab)

Directional interpolation of sparsely sampled cone-beam CT sinogram data

Using a set of simulated cone-beam CT projection data, it is demonstrated that inclusion of interpolated projections into the reconstruction process significantly reduces streak artifacts and noise while preserving spatial resolution to a high degree.
IEEE (opens in a new tab)

Impact of scattered radiation on spectral CT

In "Spectral CT" based on energy-resolving photon-counting detectors (also "multi-energy CT") spectral information of transmitted X-radiation is measured in order to extract additional information…
SPIE (opens in a new tab)

Method for the determination of the modulation transfer function (MTF) in 3D x-ray imaging systems with focus on correction for finite extent of test objects

It is well known that rotational C-arm systems are capable of providing 3D tomographic X-ray images with much higher spatial resolution than conventional CT systems. Using flat X-ray detectors, the…
SPIE (opens in a new tab)
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