Introduction: Motion of the patient during myocardial perfusion SPECT could potentially results in false perfusion defects. The effect of different reconstruction methods on these artifacts is not studied. Clarification of the relation between the extent, severity and duration of motion with the resultant artifacts may be helpful in designing special soft wares for motion correction. This...

A frontier-based tree-pruning algorithm (FBP) is proposed. The new method has comparable order of computational complexity, comparing with Cost-Complexity Pruning (CCP). Regarding tree pruning, it provides a full spectrum of information; specifically, (1) given the value of the penalization parameter λ, it gives the minimum size of a decision tree; (2) given the size of a decision tree, it prov...

We propose the Learned Primal-Dual algorithm for tomographic reconstruction. The algorithm accounts for a (possibly non-linear) forward operator in a deep neural network by unrolling a proximal primal-dual optimization method, but where the proximal operators have been replaced with convolutional neural networks. The algorithm is trained end-to-end, working directly from raw measured data and i...

ADP-glucose pyrophosphorylase (AGPase) catalyzes the rate-limiting step of bacterial glycogen and plant starch biosynthesis, the most common carbon storage polysaccharides in nature. A major challenge is to understand how AGPase activity is regulated by metabolites in the energetic flux within the cell. Here we report crystal structures of the homotetrameric AGPase from Escherichia coli in comp...

This paper presents an image reconstruction method for positron-emission tomography (PET) based on a penalized, weighted least-squares (PWLS) objective. For PET measurements that are precorrected for accidental coincidences, we argue statistically that a least-squares objective function is as appropriate, if not more so, than the popular Poisson likelihood objective. We propose a simple data-ba...

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...

The breakdown (BD) of one-selector-one-resistor memory cells incurs increasing crosstalk and power consumption in the cross-point array. In this work, failed bit pruning (FBP) operation selectors is presented to cope with side effects due BD cells. First, FBP concept its requirements on device parameters presented. Then wide existence demonstrated by investigating five different materials. Amon...

In this paper, we give a short description of an application development technology called Flow-Based Programming (FBP), briefly describing its basic concepts, history, and some of our experience with it. An early implementation of FBP has been in continuous production use for almost 40 years, but it is attracting attention world-wide as it is a significant and important paradigm in building an...

In the present work, faba bean protein (FBP) films plasticized with glycerol and reinforced different amounts (2.5, 5.0, 7.5 10% by weight of FBP) lignin extracted from pine cones (PL) have been obtained solution casting. The results showed an elongation at break 111.7% addition 5% PL to FBP film, which represents increase 107% compared control film. On other hand, it was observed thermogravime...

OBJECTIVE To evaluate the image quality and diagnostic accuracy of very low-dose computed tomography (CT) angiography (CTA) for the evaluation of coronary artery stenosis. BACKGROUND Iterative reconstruction (IR) has shown to substantially reduce image noise and hence permit the use of very low-dose data acquisition protocols in coronary CTA. METHODS Fifty symptomatic patients with an inter...