introduction: an efficient method of tomographic imaging in nuclear medicine is positron emission tomography (pet). compared to spect, pet has the advantages of higher levels of sensitivity, spatial resolution and more accurate quantification. however, high noise levels in the image limit its diagnostic utility. noise removal in nuclear medicine is traditionally based on fourier decomposition o...

Since about 10 years ago, computer algorithms are available that can generate probable structures of molecular crystals [1]. Such predictions are important for virtually any scientific research and industrial application that deals with molecular crystals. The modified Monte-Carlo Simulated Annealing method [2] of PI Robert Gdanitz (NCAT, Physics) is, in fact, the first method that allows for a...

The Alabama Department of Transportation and the National Center for Asphalt Technology (NCAT) are planning to construct and operate an oval test track (accelerated pavement loading facility) to evaluate the performance of various hot mix asphalt (HMA) test pavements. Auburn University has purchased 310 acres of land approximately 15 minutes from the university for the test track. Construction ...

Patient motion during myocardial SPECT profusion imaging may result in the formation of artifacts in the reconstructed images. This study attempts to present a method on the basis of modeling image frames through optimum-degree polynomial curves and fitting 2D curves to detect and correct heart motion at pixel and subpixel accuracy. To evaluate our method, NCAT phantom was shifted during data a...

PURPOSE One issue with amplitude binning list-mode studies in SPECT for respiratory motion correction is that variation in the patient's respiratory pattern will result in binned motion states with little or no counts at various projection angles. The reduced counts result in limited-angle reconstruction artifacts which can impact the accuracy of the necessary motion estimation needed to correc...

One of the main notions in category theory is the notion of limit. Similarly, one of the most commonly used techniques in homotopy theory is the notion of “homotopy limit” commonly called “holim” for short. The purpose of the this paper is to begin to develop the notion of limit for n-categories, which should be a bridge between the categorical notion of limit and the homotopical notion of holi...

Permeable pavements are considered to be one of the effective measures for LID (i.e. Low Impact Development) and SUDS Sustainable Urban Drainage System) globally. The major three types permeable (a) pervious concrete (PC), (b) previous asphalt (PA), (c) interlocked paver (PICP). performance all is satisfactory at start service life but greatly reduced if not maintained on time. Considering long...