Many clinical and research studies in nuclear medicine require quantitation of iodine-123 (123I) distribution for the determination of kinetics or localization. The objective of this study was to implement several reconstruction methods designed for single-photon emission computed tomography (SPECT) using 123I and to evaluate their performance in terms of quantitative accuracy, image artifacts,...

In the present paper, optimal quadrature formulas in sense of Sard are constructed for numerical integration integral ?ba e2?i?x?(x)dx with ? R Sobolev space L(m)2 [a,b] complexvalued functions which square integrable m-th order derivative. Here, using discrete analogue differential operator d2m/dx2m, explicit coefficients obtained. The convergence obtained formula is O(hm). As an application, ...

Fully 3D PET data are often rebinned into 2D data sets in order to avoid computationally intensive fully 3D reconstruction. Then, conventional 2D reconstruction techniques are employed to obtain images from the rebinned data. In a common scenario, 2D filtered back projection (FBP) is applied to Fourier rebinned (FORE) data. This approach is suboptimal because FBP is based on an idealized mathem...

The purpose of this study was to compare the image noise-reducing abilities of iterative model reconstruction (IMR) with those of traditional filtered back projection (FBP) and statistical iterative reconstruction (IR) in abdominal computed tomography (CT) imagesThis institutional review board-approved retrospective study enrolled 103 patients; informed consent was waived. Urinary bladder (n = ...

BACKGROUND AND PURPOSE Iterative reconstruction of CT images is characterized by reduced image noise and may allow reduction in radiation exposure. We investigated the influence of an IRT technique on image quality and radiation dose savings when applied to temporal bone CT. MATERIALS AND METHODS Based on the typical image quality level of adult subjects using routine radiation dose and FBP, ...

To evaluate the feasibility of radiation dose reduction using model-based iterative reconstruction (MBIR) for evaluating the ureters and vasculature in a phantom, a tissue-equivalent CT dose phantom was scanned using a 64-channel CT scan-ner. Tubes of varying diameters filled with different dilutions of a contrast agent, simulating ureters or vessels, were inserted into the center of the phanto...

Iterative image reconstruction with the total-variation (TV) constraint has become an active research area in recent years, especially in x-ray CT and MRI. Based on Green's one-step-late algorithm, this paper develops a transmission noise weighted iterative algorithm with a TV prior. This paper compares the reconstructions from this iterative TV algorithm with reconstructions from our previousl...

We compared a Bayesian reconstruction method with conventional filtered back projection (FBP) method in positron emission tomography (PET). In the medical scene, PET scanning plays an important role for functional diagnosis such like measuring the cerebral glucose metabolisms. Tomographic image is reconstructed from the observed data, which is the recieved signals from administrated-radioactive...

The technology of fluoro-deoxyglucose positron emission tomography (PET) has drastically increased our ability to visualize the metabolic process of numerous neurological diseases. The relationship between the methodological noise sources inherent to PET technology and the resulting noise in the reconstructed image is complex. In this study, we use Monte Carlo simulations to examine the effect ...

Objective The aim of this study was to compare the contrast gray white matter between forward-projected model-based iterative reconstruction solution (FIRST) and hybrid (IR) by measuring computed tomography value brain parenchyma. Methods Computed values in 15 areas 21 patients (7 males, 14 females; average age, 49.5 ± 10.7 years) were measured compared FIRST IR with filtered back projection (F...