High-quality limited-angle computed tomography (CT) reconstruction is in high demand the medical field. Being unlimited by pairing of sinogram and reconstructed image, unsupervised methods have attracted wide attention from researchers. The limit existing methods, however, to use [0°, 120°] projection data, quality still has room for improvement. In this paper, we propose a CT generative advers...

We have compared the performance of two different penalty choices for a penalized-likelihood sinogram-restoration strategy we have been developing. One is a quadratic penalty we have employed previously and the other is a new median-based penalty. We compared the approaches to a noniterative adaptive filter that loosely but not explicitly models data statistics. We found that the two approaches...

Background/Purpose. Limited spatial resolution of positron emission tomography (PET) requires partial volume correction (PVC). Region-based PVC methods are based on geometric transfer matrix implemented either in image-space (GTM) or sinogram-space (GTMo), both with similar performance. Although GTMo is slower, it more closely simulates the 3D PET image acquisition, accounts for local variation...

BACKGROUND AND PURPOSE Acute intracranial hemorrhage represents a severe and time critical pathology that requires precise and quick diagnosis, mainly by performing a CT scan. The purpose of this study was to compare image quality and intracranial hemorrhage conspicuity in brain CT with sinogram-affirmed iterative reconstruction and filtered back-projection reconstruction techniques at standard...

before operation. Figure 2-Twelve months after operation. Figure 3-Sinogram two years after operation. Figure 4-After a Girdlestone operation. }RoYal Liverpool Hospital, Prescot Street. Liverpool L7 8XP. England. R. Johnson, M.Ch.Orth., F.R.C.S., F R C S Ed Senior Orthopaedic Registrar R. Owen, M.Ch.Orth., F.R.C.S., Consultant Orthopaedic Surgeon K. L. Barnes, F.R.C.S., F.R.C.S.Ed., Consultant ...

We analyse the performance of statistical reconstruction (SR) methods when applied to non-continuous x-ray detectors. Robustness to projection gaps is required in x-ray CT systems with multiple detector modules or with defective detector pixels. In such situations, the advantage of statistical reconstruction is that it is able to ignore missing or faulty pixels and that it makes optimal use of ...

Introduction: Perianal fistula is a commonly encountered disease, complete evaluation of which is essential to prevent recurrent surgery. Aim: The purpose of this study was to determine the role of magnetic resonance imaging (MRI) and sinogram in evaluation of perianal sinus and comparison between two investigations in pre-operative assessment of perianal fistulas. Materials and Methods: A pros...