A new three-dimensional dosimetry technique using x-ray computed tomography (CT) to analyse polymer gels is proposed. The CT imaging is sensitive to radiation-induced density changes that occur within irradiated polyacrylamide gel (PAG). In this preliminary study, a CT imaging protocol is developed to optimize CT images of PAG; the response of PAG CT number to dose (N(CT)-dose response) and the...

Electron beam X-ray CT is a new technique for a fast measurement of multiphase flows with frame rates of 1000 images per second and more. It gives, in principle, quantitatively accurate images of the flow at high spatial resolution and it is non-intrusive since moderately radiation absorbing vessel walls can be penetrated by X-rays. However, on the road to a technical realisation of such a tech...

This research aimed to evaluate the effects of X-ray current tube on uniformity value CT image noise. used images Siemens head water phantom. The phantom was scanned with a Somatom Scope scanner for various tubes (i.e., 180 mAs, 200 220 240 and 260 mAs) voltage 110 kV, slice thickness 3 mm, FOV mm. values in noise were analyzed using standard deviation (SD). SD measured by ROI process 5 differe...

For single source helical Computed Tomography (CT), both Filtered-Back Projection (FBP) and statistical iterative reconstruction have been investigated. However for dual CT with flying focal spot (DS-FFS CT), that accurately models the scanner geometry physics remains unknown to researchers. Therefore, this paper presents a novel physics-based method DS-FFS assess its image quality. Our algorit...

This paper presents a method for improving the measurements made with direct transmission X-ray, which generate the projections that allow the use of the reconstructive tomography method. It builds on the use of the predictive Wiener filtering, which is a nonlinear filtering. Such method allows a better accuracy of the measurement obtained by the reconstructed images of Computed Tomography (CT)...

Three-dimensional printing allows for the production of highly detailed objects through a process known as additive manufacturing. Traditional, mold-injection methods to create models or parts have several limitations, the most important of which is a difficulty in making highly complex products in a timely, cost-effective manner.(1) However, gradual improvements in three-dimensional printing t...

BACKGROUND AND PURPOSE For CT scan planning, scan projection radiographs (SPR) are used. Tube tension and current for head SPR can be reduced to a minimum because of the small head diameter and because only high-contrast structures need to be visualized for planning. The goal of this study was to investigate SPR of the head in respect to effective doses, the influence of dose-reduction measures...

X-ray CT images have been widely used in clinical diagnosis in recent years. A modern CT scanner can generate about 1000 CT slices to show the details of all the human organs within 30 seconds. However, CT image interpretations (viewing 500-1000 slices of CT images manually in front of a screen or films for each patient) require a lot of time and energy. Therefore, computer–aided diagnosis (CAD...