The purpose of this study was to characterize image quality and dose performance with GE CT iterative reconstruction techniques, adaptive statistical iterative recontruction (ASiR), and model-based iterative reconstruction (MBIR), over a range of typical to low-dose intervals using the Catphan 600 and the anthropomorphic Kyoto Kagaku abdomen phantoms. The scope of the project was to quantitativ...

Objective: To evaluate the effect of low tube voltage (100 kV) combined with adaptive statistical iterative reconstruction-V (ASIR-V) on visualization and image quality Adamkiewicz artery (AKA). Methods: One hundred patients were prospectively enrolled randomly assigned into two groups (both n = 50). Group A was reconstructed filtered back projection (FBP) ASIR-V from 10% to 100% intervals. B (...

We develop two Feldkamp-type reconstruction algorithms with no backprojection weight for circular and helical trajectory with planar detector geometry. Advances in solid-state electronic detector technologies lend importance to CT systems with the equispaced linear array, the planar (flat panel) detectors, and the corresponding algorithms. We derive two exact Hilbert filtered backprojection (FB...

Applications of x-ray computed tomography (CT) vary from medical and biological imaging to material research and industrial inspection. We briefly discuss the state of the art in conventional absorption-based CT and make a link to a new imaging technique: phase-contrast CT. This technique can be implemented at third generation synchrotron radiation sources or by using a microfocus x-ray tube. U...

UNLABELLED The aim of this work was to compare the quantitative accuracy of iteratively reconstructed cardiac (18)F-FDG PET with that of filtered backprojection for both 2-dimensional (2D) and 3-dimensional (3D) acquisitions and to establish an optimal procedure for imaging myocardial viability with (18)F-FDG PET. METHODS Eight patients underwent dynamic cardiac (18)F-FDG PET using an interle...

Digital breast tomosynthesis (DBT) is an emerging modality for breast imaging. A typical tomosynthesis image is reconstructed from projection data acquired at a limited number of views over a limited angular range. In general, the quantitative accuracy of the image can be significantly compromised by severe artifacts and non-isotropic resolution resulting from the incomplete data. Nevertheless,...

C-arm computed tomography for axially long fieldof-view is an important extension to the current C-arm 3D imaging capability and can be crucial in some intra-operative cases. Recently, a novel data acquisition geometry, i.e., the EllipseLine-Ellipse trajectory, was proposed for this new technique. It has been shown that this trajectory satisfies mechanical motion constraints of a C-arm system a...

Since the development of multi-slice helical CT, cone-beam reconstruction with a helical vertex path is receiving increasing attention. The current multi-slice CT scanners are adopting a class of approximate reconstruction algorithms which can be viewed an extension of the 2-D FBP algorithm. However, these approximate algorithms break down as the pitch of helix becomes large. In fact, major com...

BACKGROUND AND PURPOSE CT in low dose technique is the criterion standard imaging modality for evaluation of the paranasal sinus. Our aim was to evaluate the dose-reduction potential of a recently available sinogram-affirmed iterative reconstruction technique, regarding noise, image quality, and time duration when evaluating this region. MATERIALS AND METHODS CT was performed on a phantom hea...

UNLABELLED Gated SPECT recorded with 16 intervals determines left ventricular (LV) ejection fraction more accurately than does gated SPECT recorded with 8 intervals but produces higher image noise. This study aimed to assess the results from sestamibi and (201)Tl 16-interval gated SPECT when both signal-to-noise ratio and spatial resolution were enhanced with an original method of reconstructio...